MTZ 900, 900.3, 920.3, 950, 920 Operating Manual

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Page 1

MTZ

TRACTORS

900/900.3

920/920.2/920.3

950/950.3

952/952.2/952.3

900 – 0000010 OM

OPERATING MANUAL

2009

Page 2

IMPORTANT!

If the tractor is operated by the user or lent/leased, make sure that the operator prior to working on the tractor:

A. has been instructed on safety measures and proper tractor use; B. has studied and understood the content of this Operating Manual.

NOTE!

Due to continual improvement of the products manufactured, some modifications not reflected herein may be made to the design of some subassemblies and parts. Some technical data and illustrations given herein may differ from the actual ones for your tractor. The dimensions and weights are approximate (reference). For the detailed information, contact the MTZ trademark dealer.

General note: The references to the “left” and “right” in the text of this Manual are given from the standpoint of the observer staying behind the tractor moving ahead.

Page 3

Table of Contents

Introduction

Adopted Abbreviations and Symbolic Notations

International Symbols

Safety Precautions

Technical Data

Controls and Instruments

Operating Instructions

Unitization

127

Adjustments

155

Maintenance

170

Troubleshooting

219

Tractor Transportation and Towing

227

Tractor Storage

228

Appendix А. Electric Equipment

229

Page 4

ATTENTION OF THE TRACTOR OPERATORS!

1. Prior to operating the tractor, read carefully this User Manual and follow strictly its requirements.

2. Apply the climatic diesel fuel according to the Manual. Reduce the motor oil changeover intervals by half, if the sulphur content in the fuel is below 1%.

3. Do not allow the diesel engine idling for more than 15 minutes.

4. Please keep in mind that the engine can be only started when the gearbox lever is set to the leftmost position (to the position of engagement of the 1st or 2nd range of gears).

5. When operating the tractor without the rear PTO, put the switchover shifter arm of the independent two-speed PTO drive to position I (540 rpm), the independent synchronous PTO drive – to the neutral (middle) position and the control lever – to the position “PTO OFF” (refer to Section “Operating controls and Instrumentation”).

6. Use the synchronous PTO drive at the tractor unit movement speeds not exceeding 8 km/h. Otherwise, severe damages of the tractor transmission can be caused.

7. The tractor should be only operated at the 9th gear with the higher gear range (range II) engaged.

8. The tractor cab is equipped with a single seat and only the operator must be in.

9. When shipping the tractor from the factory, some tractor components are packed in the box of spare parts and accessories, toolbox or cab. Fit them onto the tractor by your own.

10. When putting new storage batteries into operation, remove the airtight film from the air holes or cut the lugs on PE plugs off.

11. Do not allow tractor operation with the clutch disengaged or incompletely engaged.

12. When starting the movement, make sure that the manual reserve parking brake is off.

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13. When using the tractor without drive shafts, put FDA lever to position “forced”.

14. Do not operate the tractor indoors without adequate ventilation (air exchange). Exhaust gases can lead to fatal outcome.

15. Towing the tractor with front wheels lifted is strictly forbidden. Otherwise, the FDA drive failure and emergency situation can occur.

16. Never lift the tractor by the front part of the tractor by the towing shackle. Use the shackle for towing only.

17. The manufacturer is improving continually the tractor due to that there could be some modifications of the design of some components and their operating rules is not reflected in this Manual.

Page 6

INTRODUCTION

The MTZ wheeled universal tilling tractors of the 900 series belong to drawbar category

1.4 and are designed to perform a wide range of agricultural works: from soil

preparation for sowing to harvesting and transporting operations; they can be used in forestry, municipal servicing, construction and industry.

This Manual contains the description of the design peculiarities, brief technical data and recommendations for operation and maintenance of the following MTZ tractors of 900 series: MTZ- 900 (4х2) with the Д-243/Д-243C diesel engine (59.6 kW/2200 rpm) and synchronized gearbox; MTZ-900.3 (4х2) with the Д-245.43 S2 diesel engine (62 kW/1800 rpm), synchronized gearbox and updated design; MTZ-920 (4х4) with the Д-243/Д-243C diesel engine (59.6 kW/2200 rpm), synchronized gearbox and FDA (72); MTZ-920.2 (4х4) with the Д-243/Д-243C diesel engine (59.6 kW/2200 rpm), synchronized gearbox, FDA (822) and updated design; MTZ-920.3 (4х4) with the Д-245.43 S2 diesel engine (62 kW/1800 rpm), synchronized gearbox, FDA (822) and updated design; MTZ-950 (4х2) with the Д-245.5/Д-245.5C diesel engine (65 kW/1800 rpm), synchronized gearbox; MTZ-950.3 (4х2) with the Д-245.5 S2 diesel engine (65 kW/1800 rpm), synchronized gearbox and updated design; MTZ-952 (4х4) with the Д-245.5/Д-245.5C diesel engine (65 kW/1800 rpm), synchronized gearbox and FDA (72); MTZ-952.2 (4х4) with the Д-245.5/Д-245.5C diesel engine (65 kW/1800 rpm), synchronized gearbox, FDA (822) and updated design; MTZ-952.3 (4х4) with the Д-245.5 S2 (70 kW/1800 rpm) diesel engine, synchronized gearbox, FDA (822) and updated design.

Index ―.2‖ means upgrading of the respective model by installing one or several units of higher engineering level:

 FDA with planetary reducing gears (for 4x4 tractors);  Hydraulic lift-based hookup;  Bonnet, roof, cab fender of updated design.

Index ―.3‖ means installation of diesel engines with index S2 certified as per the 2nd stage of the ecological regulation of Directive 2000/25/EC, hydrostatic power steering (HPS) system with an independent oil tank, as well as the bonnet, the roof and cab fenders of renewed design.

Making any re-equipment or modifications to the tractor design, which are not authorized by the Manufacturer is strictly forbidden.

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The distinctive features of the tractors described in the Manual:

1. Transmission with synchronized gearbox (7/2) and synchronized reducing gear (step-

up gear): 14 forward and 4 reverse gears.

2. Hydrostatic power steering with the Danfoss metering pump, cylinder in steering

trapezium and steering tie rod.

3. Unified rear driving axle with more convenient external readjustment of planetary

gear brake bands.

4. Hydraulic system with a power regulator completely controlling the rear attachment

cylinder. Three sections of the distributor ensure the control of external cylinders of machines and tools.

5. Safe comfortable cab meets the requirements of EC and OECD directives and is

featured by the improved interior, heating and ventilation system.

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Adopted Abbreviations and Symbolic Notations

—

storage battery

—

differential lock

PCU

—

pre-heater control unit

SCU

—

starter control unit

UDP

—

diesel piston upper dead point

PTO

—

power take-off shaft

HMS

—

hydraulic mounted system

HPS

—

hydrostatic power steering

LOHE

—

liquid oil heat exchanger

RMA

—

rear mounted attachment

ID — integrated display

—

gearbox

C — clutch

CAC

—

charge air cooler

FDA

—

front driving axle

ADCS

—

automatic tilling depth control system

M — maintenance

DHM

—

traction hitch mechanism

SRU

—

speed reducer

ETPP

—

electric torch pre-heater

ОЕСD

—

Organization for Economic Cooperation and Development

Page 9

International Symbols

Manufacture uses standard international symbols concerning the application of devices and the controls.

Below are given the symbols with their meaning.

— See Manual

— Control manipulations

— Brake

— Fast

— Parking brake

— Slow

— Horn

— Forward

— Emergency alarm

— Reverse

— Fuel level in the tank

— Battery charging — Cooling fluid

— Cab light

— Starting flame preheater

— Clearance lights

— Engine speed

— Turn indicator

— Oil pressure in the engine

— Upper beam

— Engine cooling fluid

temperature

— Lower beam

— Off/Stopped

— Working lights

— On/Start

— Differential locking

— Ramping

— PTO engaged

— Lever – down

— FDA engaged

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— Lever – up

— Fan

— Lifting position of the

distributor sliding valve

— Windscreen washer

— Lowering position of the

distributor sliding valve

— Windscreen wiper

— Floating position of the

distributor sliding valve

— Rear screen wiper

— Oil pressure in the gearbox

— Trailer turn indicator

— Air pressure in the

pneumatic system

— Oil pressure in the

hydrostatic power steering

— High voltage

— Oil pressure in the

transmission

— Cooling fluid level

— Brake fluid level

— Road train lights

— Air pressure in the brake

system

— Air filter clogging

Page 11

Safety Precautions

MTZ series 900

SAFETY PRECAUTIONS

Strict observance of safety precautions, accurate execution of tractor driving and operation regulations and maintenance shall guarantee complete safety of its application.

Safety precautions when operating the tractor

ATTENTION! When starting up the en- gine and operating the controls, always

stay in the cab on the operator’s seat

General Instructions

•

• Prior to tractor use, study operator’s

manual carefully. Insufficient knowledge on tractor driving and operation can result in accidents.

• Specially trained and qualified operators only are allowed to operate the tractor.

• If the tractor is equipped with a safety belt, use it during operation. If not, contact the dealer.

• Never admit a passenger to the cab unless the latter is provided with an ad d i t i o n a l s e a t a n d h a n d -rail. There is no other safe seat for a passenger in the c a b !

• Keep all warning plates clean. In case of their damage or loss, replace them by new ones.

• Prior to operation, carefully inspect the tractor and a trailed mechanism. Start operation having made sure that they are in good repair. The trailed agricultural mechanisms and transport trailers shall be fitted with rigid hitches excluding their swinging and rear-end collision with the tractor during transportation.

• Prior to starting the diesel engine, the parking brake shall be applied; the gear shift lever shall be set to

the neutral position and the PTO lever – in the OFF position.

• Prior to starting the movement, warn the bystanders and the persons working on the trailed mechanisms with a horn.

• Never leave the moving tractor.

• Prior to leaving the cab, disen-

gage the PTO, stop the engine, apply the parking brake, take off the starter switch key and set the battery disconnect switch to the OFF position.

It is forbidden to de-energize the electric equipment system by the starter and instrumentation switch and/or battery disconnect switch until the engine is stopped.

• Do not operate the tractor indoors without necessary ventilation. Exhaust gases can result in fatal outcome!

• In case of failure of the engine or steering control, stop the tractor immediately. Keep in mind that turning the steering wheel for controlling the tractor when the engine is stopped requires much more force. In case of failure of the steering control, a lamp of emergency oil pressure in the HVSS lights up.

• Do not work under lifted agricultural implements. During durable stops, leave the attached implement lifted.

• If the front part of the tractor takes off when attaching heavy mechanisms and implements, mount front weights.

• When operating the front lift, fill in the rear tires with liquid ballast.

• Prior to lifting and lowering the attached agricultural implements as well as when turning the tractor, make sure that there is no risk of hitting or snagging on somebody or

Page 12

Safety Precautions

MTZ series 900

any obstacle.

• When moving with attached mechanisms or implements, always apply a mechanism to lock on the attachment in lifted position.

• The drive shaft transferring the rotation from the tractor PTO to the driven components shall be enclosed.

• Make sure that any additional equipment or auxiliaries are installed correctly and that they are designed for application with your tractor. Keep in mind that your tractor, if used unduly can be dangerous both for yourself and other persons. Do not operate equipment not designed for installation on the tractor.

• To avoid turnover, be careful when driving the tractor. Choose safe speed corresponding to road conditions, particularly when driving cross-country, passing the ditches, slopes and during sharp turns.

• When operating on the slopes, increase the tractor track to the maximum value.

• Do not make sharp turns under full load and high speed.

• When using the tractor for transportation works:

- increase the tractor track to at least 1800 mm;

- interlock the brake pedals, check and, if necessary, adjust the brakes to synchronous action;

- check operation of the parking brake, brake pneumatic drive and trailer brakes;

- check the state of the light and audio alarm devices;

- transport trailers shall be fitted with rigid hitches and connected by means of the safety chain or rope;

- never drive downhill with

switched-off gear (coasting), apply the same gear both down and uphill;

- it is forbidden to work with the trailer without independent brakes, if its weight exceed half actual weight of the tractor. The faster you move and the larger the towed mass is, the larger the safety distance shall be;

- disengage the FDA to avoid excessive wear and tear of the drive parts and tires;

- do not use rear axle differential lock (DL) at the speed of above 10 km/h and during turns;

Important! Use the synchronous PTO drive at the lower gears of the gearbox at the tractor movement speed not exceeding 8 km/h. Otherwise, the tractor’s power train can be severely damaged.

- do not stop the tractor on the slopes. If the stop is still necessary, engage the 1st gear and apply the parking brake.

• when operating the equipment driven by PTO, make sure that the PTO coupler shank has fully stopped after stopping the engine before leaving the cab and disconnecting the equipment.

• Do not wear loose clothes when operating PTO or near the rotating equipment.

• When operating stationary mechanisms driven by PTO, always apply the parking brake and lock on the rear wheels from the front and behind. Make sure that the mechanism has been reliably secured.

• Make sure that the PTO coupler shank protection has been installed and, if the PTO is not used, refit the cap of the PTO coupler shank.

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Safety Precautions

MTZ series 900

• Do not clean, adjust or maintain the equipment driven with PTO, when the engine is running.

Safety precautions during the maintenance

• Never refuel the tractor when the engine is running.

• Never smoke when refuelling.

• Never fill the tank to the top.

Leave some space for fuel expansion.

• Never add gasoline or mixtures to diesel fuel. These combinations can increase the risk of fire or explosion.

• Use the summer or winter fuel grades properly. Refill the tank at the end of each day to reduce night moisture condensation.

• To avoid fuel spillage during the mechanized refuelling of the tractor, remove the mesh filter from the fuel tank neck. The mesh filter is designed for tractor manual refuelling under field conditions.

• Fill in the tractor with oils and lubricants recommended by the manufacturer. Application of other lubricating materials is strictly forbid-

den!

• Any operations related to cleaning the engine and tractor, preoperation, maintenance, etc. should be performed with the engine stopped and tractor braked.

• Cooling system operates under pressure, which is maintained by a valve installed in the cap of the filler neck. It is dangerous to re-

move the lid on the hot diesel engine. To avoid burns of hands

and face, unplug the radiator neck cap on the hot engine carefully, having put a thick cloth on the cap

and a gauntlet on the hand.

• To avoid burns, be careful when draining the cooling fluid or water from the cooling system and/or hot oil from the engine, hydraulic system and transmission.

• When servicing the storage batteries, be careful because the contact of electrolyte with the skin causes burns.

• To avoid the risk of explosion, keep any sources of open flame away from the engine fuel system and storage batteries.

• Keep the tractor and its equipment, particularly the brakes and steering, in serviceable condition to

ensure your and bystanders’ safety.

• Do not make any modifications to

the tractor or any parts thereof without approval of your dealer and manufacturer.

Safety requirements during operation and maintenance of electrical equipment

• To avoid damage of semiconductor devices and resistors, observe the following precautions:

- do not disconnect the storage battery (SB) terminals with the engine running. This will cause peak voltage to appear in the discharge circuit and lead to unavoidable failure of diodes and transistors;

- do not disconnect electric cables until the engine is shut down and all switches are off;

- do not allow a short circuit to occur due to incorrect wire connection. Short circuit or wrong polarity will cause failure of diodes and transistors;

- do not connect the SB to electrical equipment system until the polarity

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Safety Precautions

MTZ series 900

of outputs and voltage is verified;

- do not check the presence of electric current by producing a spark, since this would lead to immediate breakdown of the transistors.

Hygienic requirements

• Fill in a vacuum flask with fresh portable water daily.

• Firs-air kit shall be necessarily stuffed with bandages, tincture of iodine, ammonia spirit, borated petrolatum, soda, validol and dipyrone.

• Depending on the operating conditions, use the natural ventilation of the cab or the latter’s heating and cooling unit.

• Should the durations of the continuous work on the tractor exceed

2.5 hours within a working shift, the noise protection facilities to State Standard ГОСТ 12.4.051-87 (ear- plugs, antiphones) shall be used.

Fire safety requirements

• The tractor shall be provided with fire-fighting equipment, i.e. a spade and fire extinguisher. It is forbidden to operate the tractor without fireextinguishing equipment.

• The places for parking the tractor and storing the combustive and lubricating materials shall be tilled with a strip of min 3 m wide and provided with fire-extinguishing equipment.

• Do not allow manifold and silencer soiling with dust, fuel, straw, etc.

• Do not allow straw to wind around rotating parts of mechanisms unitized with the tractor.

• When washing the parts and assembly units in kerosene or gaso-

line, take measures excluding ignition of flushing liquid vapours.

• Do not operate the tractor in firerisky place with the bonnet and other protective facilities removed from the heated engine parts.

• Do not allow using open flame to heat oil in engine pan or burn out soiling of radiator core.

• If a seat of fire occurs, strew sand over it and cover it with tarpaulin, sack cloth or other thick fabric. Use a carbon dioxide fire extinguisher. Do not extinguish burning fuel with water.

• Watch that there are no highly inflammable materials near the manifold and the silencer when the engine is running.

• When harvesting hay, straw, working in places of higher fire risk, apply spark suppressors in the exhaust system as an assembly with the silencer or independently.

Page 15

Specifications

MTZ series 900

SPECIFICATIONS

Parameter

9 0 0 / 900.3

920/920.2/920.3

950/950.3

95 2/952.2/952.3

А Length, mm: total without weights to wheels

4120/4440 3840/4440

3700

4120/4130/4440 3970/4000/4060 3840/3850/3850

4120/4440 3840/4060

3700

4120/4130/4400 3970/4000/4060 3840/3850/3850

В Width, mm

1970

С Height to cab top, mm

2820

2850

2820

2850

D Longitudinal base, mm

2370±20

2450±20

2370±20

2450±20

Е Rear wheel track, mm

1500-1600/1800-2100

F Front wheel track, mm

1450-1850

1410-1990/1420-1970

1450-1850

1410-1970/1420-1970

G Clearance, mm

465

Tire size: front wheels

9,00-20;9,00R20

13,6-20;360/70R24

9,00-20;9,00R20

13,6-20;360/70R24

rear wheels

18,4R34 (Ф-11)

16,9R38;

18,4R34 (Ф-11)

16,9R38;

18,4R34

Service weight (without ballast), kg

3850/3950

4100/4200/4300

3850/3950

4100/4200/4300

Numbers of tractor component parts

Name plate of the tractor containing the serial numbers of the tractor and engine.

Page 16

Specifications

MTZ series 900

The serial number of the tractor is replic a ted on the front end of the right-h a n d side member of the half-frame (on the right

plate of front balance weights) .

Engine number (is duplicated on engine

name plate attached on the right of the cylinder block) .

Clutch number (on the left of the clutch housing).

Gearbox number (on the left of the gearbox housing)

Page 17

Specifications

MTZ series 900

Transmission number (on the rear axle housing from behind).

Transmission number for the tractor with hydraulic lift (on the rear axle housing at the joint with the gearbox on the right).

FDA number (on the right -hand sleeve at the front of the FDA (822) o r on the central housing at the front of the FDA (72)) .

Cab serial number and OECD certificate num ber (inside the cab on the left).

Page 18

Specifications

MTZ series 900

Engine

Engine make

Д-243/243C

Д-245.5/Д-245.5C

Д-245.43 S2

Д-245.5 S2

Type

Four-stroke, inline, naturally aspirated

Four-stroke, inline, turbocharged

Four-stroke, inline, turbocharged, with intermediate charge air cooling

Number of cylinders

Method of mixing

Direct injection

Compression (calculated)

15.1

Bore, mm

110

Stroke, mm

125

Displacement, l

4.75

Order

1-3-4-2

Cooling system

Liquid

Rated speed, rpm

2200

1800

Max speed, rpm

2380

1980

2050

2070

Min speed, rpm

600

700

800

Rated power, kW (H.P.)

60 (81)

at 2200 rpm

65 (89)

at 1800 rpm

62 (83.7)

at 1800 rpm

70 (94.5)

at 1800 rpm

Max torque N·m

296.9 at 1400 rpm

386

at 1400 rpm

411

at 1400 rpm

464

at 1400 rpm

Clearance between intake and exhaust valves and rockers at idle running, mm

0.25…0.30

0.25…0.30 – for

intake valves,

0.40…0.45 – for exhaust valves

0.20…0.30 – for

intake valves,

0.35…0.50 – for exhaust valves

0.20…0.30 – for

intake valves,

0.35…0.50 – for exhaust valves

Advance angle of fuel injection before upper dead point (UDP), degrees

20±1/16±1

18±1/13±1

or 9±1

4.0±0.5

Fuel injection pressure, MPa

21.6…22.4

23.5…24.7

Page 19

Specifications

MTZ series 900

Diesel engine lubrication system

Type: combined, with oil radiator (or

LOHE for tractors

900.3/920.3/950.3/952.3).

Min oil pressure:

0.08 MPa (0.8 kgf/cm2) at 600 rpm.

Normal oil pressure:

0.2…0.3 MPa (2…3 kgf/cm2). Max pressure at cold diesel engine: up to 0.6 MPa (6 kgf/cm2).

Lubrication system capacity: 12 l. Motor oil brands:

- from -40°С to +5°С: М-8ДМ; М-8Г2, М-8Г2К or М4

/8Г

(SAE-20,

SAE 10W-20);

- from +5°С to +50°С: М-10ДМ; М-10Г2; М-10Г2К (SAE-30);

- multigrade oil: SAE 15W-40.

Engine feed system Fuel pump: 4-plunger pump, in-line, with

boost pump. Governor: mechanical, variable-speed (with antismoke pneumatic equalizer – for diesel engines Д-245.5/Д-245.5C/ Д-245.5 S2/Д-245.43 S2). Turbocharger: centripetal radial turbine on a shaft with centrifugal compressor (Д-

245.5/ Д-245.5C/Д-245.5 S2/Д-245.43 S2).

Charge air cooler (for Д-245.5S2/Д-

245.43S2): air-air type, mounted prior to

water radiator. Fuel filters: coarse filter and secondary filter (with removable paper filter element). Fuel brand: Diesel: summer

Л-0.2-40, Л-0.5-40; winter З-0.2, З-0.5; at 50°С – А-0.2, А-0.4.

Fuel tank capacity: 130 l (2 tanks); 120 l (one tank) for tractors with hydraulic lift. Air cleaner: combined, with centrifugal and oil-bath air cleaning.

Air cleaner oil bath capacity: 1.5 l (3.0 l – for the Д-245.5 engine).

Donaldson dry-type air cleaner – for Д-

245.5 S2/ Д-245.43 S2.

Engine starting system

Electric starter type, 12 V or 24 V. Easy starting facilities:

- electric torch pre-heater (filament plug in the intake manifold) or filament plugs in diesel cylinder head (for the engines with the index ―S2‖).

Engine cooling system Type: water, closed with forced liquid cir-

culation, temperature controlled by the thermostatic regulator and a shutter from

the driver’s seat, with expansion tank (for Д-245.5 S2/Д-245.43 S2).

Normal operating temperature: from 80°С

to 100°С.

Cooling system capacity: 20 l.

Steering control Type: Hydrostatic power steering with

steering cylinder in the steering linkage. Independent oil tank of HPS (for MTZ -

900.3/920.3/950.3/952.3). Safety valve adjustment pressure – 14 MPa. Shock valve adjustment pressure – 20 MPa. Oil brands: BECHEM Stariol №32; ADDINAL Hydraulikol HLP 32; THK Hydraulic HLP 32.

Feed pump capacity: 21 l/min (28 l/min)* Hydraulic cylinder: two-way type,

• bore: 50 mm (63 mm)*

• stroke: 200 mm.

Metering pump: volumetric constant: 100 cm3/rev (160 cm3/rev)*, operating pressure: from 10 to 14 MPa. Installed at the front wall of the cab.

Steering wheel position control limits:

• by inclination: from 25° to 40° with fixation through 5°;

• by height: – within the range of 100 mm. Steering wheel free play: not more

For the FDA with planetary-cylindrical reducing

gears (MTZ-920.2/920.3/952.2/952.3)

Page 20

Specifications

MTZ series 900

than 25°.

Clutch

Type: friction, dry, single-disk, with tangential suspension of the pressure plate.

Driven disk diameter – 3 40 mm.

Gearbox

Type: 7/2, mechanical, stepwise, syn-

chronized, dual-range.

I range (stage): 1

s t

, 2

n d

and 3

r d

gear of for -

ward motion and one gear of reverse. I I range (stage): 1

s t

, 2

n d

, 3

r d

and 4

t h

gears

of forward motion and one of reverse.

ATTENTION! The 4

t h

gear can be only

e n g a g e d i f t h e I I range is selected.

Calculated speeds (km/h) of MTZ 900 series tractors:

Rated engine rotational speed, rpm: 2 2 0 0 Rear tyres: 18.4R34

Synchronized splitter

Motion

Gear

number

Gear

number

V tr,

km/h

front

2.5

3.2 2 7.1

9.4 3 8.4

11.1

4.2

5.5 2 12.1

16.0

14.3

18.9

26.6

35.2

rear

5.2

6.8

8.8

11.6

Rated engine rotational speed, rpm: 2 2 0 0 Rear tyres: 16.9R38

Synchronized splitter

Motion

Gear

number

Range

number

V tr,

km/h

front

2.5

3.4 2 7.4

9.8 3 8.7

11.6

4.3

5.7

12.6

16.6

14.9

19.7

27.7

36.6

rear

5.4

7.1

9.1

12.1

Page 21

Specifications

MTZ series 900

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 16.9R38

Synchronized multiplier

Motion

Gear

number

Range

number

V tr,

km/h

front

2.8

3.6 2 8.0

10.6 3 9.5

12.5

4.7

6.2

13.6

18.0

16.1

21.3

29.9

39.6

rear

5.8

7.7

9.9

13.1

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 18.4R34

Synchronized multiplier

Motion

Gear

number

Range

number

V tr,

km/h

front

2.7

3.5 2 7.7

10.2 3 9.1

12.0

4.5

6.0

13.1

17.3

15.5

20.5

28.8

38.1

rear

5.6

7.4

9.5

12.6

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 18.4R34

Synchronized splitter

Motion

Gear

number

Range

number

V tr,

km/h

front

2.0

2.7 2 5.8

7.7 3 6.9

9.1

3.4

4.5 2 9.9

13.1

11.7

15.5

21.8

28.8

rear

4.2

5.6

7.2

9.5

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 16.9R38

Synchronized splitter

Motion

Gear

number

Range

number

V tr,

km/h

front

2.1

2.8 2 6.0

8.0 3 7.1

9.4533

3.5

4.7

10.3

13.6

12.2

16.1

22.6

29.9

rear

4.4

5.8

7.5

9.9

Page 22

Specifications

MTZ series 900

ATTENTION! Simultaneous engagement of the 4th forward gear and reverse gear is excluded by the design to avoid high reverse speeds of the tractor.

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 16.9R38

Reverse gear

Motion

Gear

number

Range

number

V tr,

km/h

front

2.8

4.7

8.0

13.6

9.5

16.1

4 29.9

rear

2.6

4.4

7.5

12.7

8.8

15.0

Rated engine rotational speed, rpm: 2 2 0 0 Rear tyres: 16.9R38

Reverse gear

Motion

Gear

number

Range

number

V tr,

km/h

front

3.4

5.7

9.8

16.6

11.6

19.7

4 36.6

rear

3.1

5.4

9.1

15.6

10.8

18.7

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 18.4R34

Reverse gear

Motion

Gear

number

Range

number

V tr,

km/h

front

2.7

4.5

7.7

13.1

9.1

15.5

4 28.8

rear

2.5

4.2

7.2

12.2

8.5

14.5

Rated engine rotational speed, rpm: 2 2 0 0 Rear tyres: 18.4R34

Reverse gear

Motion

Gear

number

Range

number

V tr,

km/h

front

3.2428

5.5215

9.3909

15.9898

11.1207

18.9353

35.2157

rear

3.0266

5.1534

8.7648

14.9238

10.3794

17.6730

Page 23

Specifications

MTZ series 900

Calculated speeds (km/h) of the MTZ tractors of the series 900 with a speed-reducing u n i t:

Rated engine rotational speed, rpm: 1800 Rear tyres: 18.4R34

Synchronized splitter

V tr with a mechanical

speed-reducing unit, km/h

V tr with a hydraulic speed-reducing unit, km/h

Mechanical

speed-

reducing unit

range I

Mechani-

cal speed-

reducing

unit range

Hydraulic speed-reducing

unit range I

Hydraulic speed-

reducing unit

range II

Gear No.

Range No.

V tr,

km/h

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

4.28

1.44

1.03

0.34

4.28

1.44

1.03

0.3

2.0

0.47

1.4

2.0

5.9

0…

0.5

0.8…

1.4

2.0

6.0

2.7

0.6

1.8

2.6

7.8

0.12…

0.6

1.2…

1.8

2.6

7.9

5.8

7.7 3 6.9

9.1

3.4

0.8

2.4

3.3

10.0

0.3…

0.8

1.7…

2.4

3.34

10.0

4.5

1.1

3.1

4.4

13.3

0.5…

1.1

2.3…

3.1

4.4

13.3

9.9

13.1

11.7

15.5

21.8

28.8

1R I 4.2

1.0

3.0

4.1

12.4

0…

1.0

0…

3.0

4.1

12.4

5.6

1.3

3.9

5.4

16.4

0.3…

1.3

0.3…

3.9

5.4

16.4

7.2

1.7

5.0

7.0 0.6…

1.7

0.6…

5.0

7.0

9.5

2.2

6.6

9.2 1.1…

2.3

1.1…

6.7

9.2

Page 24

Specifications

MTZ series 900

Rated engine rotational speed, rpm: 2200 Rear tyres: 18.4R34

Synchronized splitter

V tr with a mechanical

speed-reducing unit, km/h

V tr with a hydraulic speed-reducing unit, km/h

Mechanical

speed-

reducing unit

range I

Mechanical

speed-

reducing

unit range II

Hydraulic speed-reducing

unit range I

Hydraulic

speed-reducing

unit range II

Gear No.

Range No.

V tr, km/h

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

4.28

1.44

1.03

0.34

4.28

1.44

1.03

0.3

2.5

0.6

1.7

2.4

7.2

0…

0.6

0.8…

1.7

2.4

7.2

3.2

0.8

2.3

3.1

9.5

0.1…

0.8

1.2…

2.39

3.1

9.5

7.1

9.34

8.4

11.1

4.2

1.0

2.9

4.1

12.3

0.3…

1.0

1.7…

2.9

4.1

12.3

5.5

1.3

3.8

5.4

16.2

0.5…

1.3

2.3…

3.8

5.4

16.2

12.1

16.0

14.3

19.0

26.6

35.2

1R I 5.2

1.2

3.6

5.0

15.2

0…

1.24

0…

3.6

5.0

15.2

6.8

1.6

4.7

6.6

20.1

0.3…

1.6

0.3…

4.7

6.6

20.1

8.8

2.1

6.1

8.5 0.6…

2.06

0.6…

6.1

8.5

11.6

2.7

8.1

11.3

1.1…

2.7

1.1…

8.1

11.3

Page 25

Specifications

MTZ series 900

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 16.9R38

Synchronized splitter

V tr with a mechanical speed-

reducing unit, km/h

V tr with a hydraulic speed-reducing unit, km/h

Mechanical

speed-reducing

unit range I

Mechanical

speed-

reducing

unit range II

Hydraulic speed-reducing

unit range I

Hydraulic speed-

reducing unit

range II

Gear No.

Range No.

V tr, km/h

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

4.28

1.44

1.03

0.34

4.28

1.44

1.03

0.3

2.1

0.5

1.4

2.0

6.1

0…

0.5

0.8…

1.4

2.0

6.1

2.8

0.6

1.9

2.7 0.1…

0.6

1.2…

1.9

2.7

8.1

6.0

8.0 3 7.1

9.5

3.5

0.8

2.5

3.4

10.4

0.3…

0.8

1.7…

2.5

3.4

10.4

4.7

1.1

3.3

4.6

13.8

0.5…

1.1

2.3…

3.26

4.6

13.8

10.3

13.6

12.2

16.1

22.6

30.0

4.4

1.0

3.0

4.3

12.9

0…

1.0

0…

3.0

4.3

13.0

5.8

1.4

4.0

5.6

17.1

0.3…

1.4

0.3…

4.0

5.6

17.1

7.5

1.7

5.2

7.3 0.6…

1.7

0.6…

5.2

7.3

9.9

2.3

6.9

9.6 1.1…

2.3

1.1…

6.9

9.6

Page 26

Specifications

MTZ series 900

Rated engine rotational speed, rpm: 2200 Rear tyres: 16.9R38

Synchronized splitter

V tr, with a mechanical

speed-reducing unit, km/h

V tr with a hydraulic speed-reducing unit, km/h

Mechanical

speed-

reducing unit

range I

Mechani-

cal speed-

reducing

unit range

Hydraulic speed-reducing

unit range I

Hydraulic speed-

reducing unit

range II

Gear No.

Range No.

V tr, km/h

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the mechanical

speed-reducing unit

2nd gear of the mechanical

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

1st gear of the hydraulic

speed-reducing unit

2nd gear of the hydraulic

speed-reducing unit

4.28

1.44

1.03

0.34

4.28

1.44

1.03

0.3

2.5

0.6

1.8

2.5

7.5

0…

0.6

0.8…

1.8

2.5

7.5

3.4

0.8

2.3

3.3

10.0

0.1…

0.8

1.2…

2.3

3.3

9.9

7.4

9.8

8.7

11.6

4.3

1.0

3.0

4.2

12.8

0.3…

1.0

1.7…

3.0

4.2

12.8

5.7

1.3

4.0

5.6

16.9

0.5…

1.3

2.3…

4.0

5.6

16.9

12.6

16.6

14.9

19.7

27.7

36.6

1R I 5.4

1.3

3.7

5.2

15.8

0…

1.3

0…

3.7

5.2

15.8

7.1

1.7

5.0

6.9

20.9

0.3…

1.7

0.3…

5.0

6.9

20.9

9.1

2.1

6.3

8.9 0.6…

2.1

0.6…

6.3

8.9

12.1

2.8

8.4

11.7 1.1…

2.82

1.1…

8.4

11.7

Page 27

Specifications

MTZ series 900

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 16.9R38

Reverse gear

V tr, with a mechanical speed-reducing

unit, km/h

Mechanical speed-

reducing unit range I

Mechanical speed-

reducing unit range

Motion

Gear No.

Range No.

V tr, km/h

1st gear of the

mechanical

speed-reducing

unit

2nd gear of the

mechanical

speed-reducing

unit

1st gear of the

mechanical

speed-reducing

unit

2nd gear of the

mechanical

speed-reducing

unit

4.28

1.44

1.03

0.34

front

1 I 2.8

0.6

2.0

2.7

8.1 II

4.7

1.1

3.3

4.6

13.8 2 I

8.0

13.6

3 I 9.5

16.11

4 30.0

rear

1 I 2.6

0.6

1.8

2.5

7.6

4.4

1.0

3.0

4.3

12.9

2 I 7.5

12.7

3 I 8.8 II

15.0

Rated engine rotational speed, rpm: 2200 Rear tyres: 16.9R38

Reverse gear

V tr, with a mechanical speed-reducing

unit, km/h

Mechanical speed-

reducing unit range I

Mechanical speed-

reducing unit range

Motion

Gear No.

Range No.

V tr, km/h

1st gear of the

mechanical

speed-reducing

unit

2nd gear of the

mechanical

speed-reducing

unit

1st gear of the

mechanical

speed-reducing

unit

2nd gear of the

mechanical

speed-reducing

unit

4.28

1.44

1.03

0.34

front

1 I 3.4

0.8

2.3

3.3

10.0

5.7

1.3

4.0

5.6

16.9

2 I 9.8

16.6

3 I 11.6

19.7 4

36.6

rear

1 I 3.1

0.7

2.2

3.1

9.2 II

5.4

1.3

3.7

5.2

15.7

2 I 9.1

15.5

3 I 10.8

18.4

Page 28

Specifications

MTZ series 900

Rated engine rotational speed, rpm: 1 8 0 0 Rear tyres: 18.4R34

Reverse gear

V tr, with a mechanical speed-reducing

unit, km/h

Mechanical speed-

reducing unit range I

Mechanical speed-

reducing unit range

Motion

Gear No.

Range No.

V tr, km/h

1st gear of the me-

chanical speed-

reducing unit

2nd gear of the

mechanical speed-

reducing unit

1st gear of the me-

chanical speed-

reducing unit

2nd gear of the

mechanical speed-

reducing unit

4.28

1.44

1.03

0.34

front

1 I 2.7

0.6

1.8

2.6

7.8

4.5

1.1

3.1

4.4

13.3

2 I 7.7

13.1

3 I 9.1

15.5

4 28.8

rear

1 I 2.5

0.6

1.75

2.4

7.3

4.2

1.0

2.9

4.1

12.4

2 I 7.2

12.2 3 I

8.5 II

14.5 4

Rated engine rotational speed, rpm: 2200 Rear tyres: 18.4R34

Reverse gear

V tr, with a mechanical speed-reducing

unit, km/h

Mechanical speed-

reducing unit range

Mechanical speed-

reducing unit range

Motion

Gear No.

Range No.

V tr, km/h

1st gear of the me-

chanical speed-

reducing unit

2nd gear of the

mechanical speed-

reducing unit

1st gear of the me-

chanical speed-

reducing unit

2nd gear of the

mechanical speed-

reducing unit

4.28

1.44

1.03

0.34

front

1 I 3.2

0.8

2.6

3.1

9.5

5.5

1.3

3.8

5.4

16.2 2 I

9.4

16.0 3 I

11.1

19.0

4 35.2

rear

1 I 3.0

0.7

2.1

3.0

9.0

5.2

1.2

3.61

5.0

15.2

2 I 8.8

15.0

3 I 10.4 II

17.7 4

Page 29

Specifications

MTZ series 900

Synchronized splitter (reducing gear) Type: mechanical, synchronized, with

direct drive and retarding gear. Located between the clutch and gearbox and controlled by the lever under the steering column. Allows reducing speed at each gear 1.32 times and obtaining 14 forward gears and 4 reverse gears.

Synchronized multiplier Type: mechanical, synchronized, with

direct drive and multiplying gear. Located between the clutch and gearbox and allows increasing speed at each gear

1.32 times.

Reverse gear (optional) Type: mechanical, synchronized, with

forward motion and reverse (i=-1.07 or i=-1.88). Installed instead of step-down reducing gear and allows obtaining 9 forward gears and 8 reverse ones.

Speed-reducing unit (optional) Type: mechanical, two-range, two-

speed. It allows super low speeds to be obtained. Installed instead of left cover of the gearbox and allows obtaining additionally 16 forward gears and 16 reverse ones.

Important! When using the speedreducing unit, engage only the 1st gear in the gearbox and the 1st reverse gear (I-I and I-R).

Page 30

Specifications

MTZ series 900

Rear axle

Main gear: a pair of bevel gears with

circular sprocket teeth.

Final drive: a pair of cylindrical gears. Differential: conical, four-satellite type. Differential lock mechanism: hydraulic,

dry, friction coupling or multi-disk friction

coupling of ―wet‖ type (optional).

Brakes Service: rear wheels: dry two- and three-

disk type with mechanical servo drive. Disk diameter: 204 m m (o r 8-disk type operating in an oil bath ( o ptional)) Parking: dry disk-type with mechanical manual drive. Disk diameter: 180 m m (o r 4disk type operating in an oil bath ( o ptional)).

Front driving axle

Type : portal, with sliding housings of bevel

reducing gears (MTZ-920/952) or portal, with non-sliding bar, with planetary reduc ing gears (MTZ-920.2/952.2/920.3/952.3)

Main gear: bevel gears with auger teeth. Differential type: self-locking, of higher

friction. Final drive: wheel reduction gears with straight bevel pairs (MTZ-

920.2/952.2/920.3/952.3).

Transmission oils: Тап-15В, ТСп-15К o r ТСп-10 (SAE 80W-90); ТАД-1 7 И.

Drive: from transfer gear by two cardan shafts with intermediate support. FDA control: mechanical, by the lever for operator’s right hand. 3 operating modes: FDA is DISENGAGED; FDA is ENGAGED forcedly; F D A is ENGAGED/DISENGAGED auto matically.

Power take-off shaft (PTO) drive

Type: independent two-speed and syn- chronous. Master clutch: planetary reducing gear

with band brakes. PTO control: mechanical (electro- hydraulic – for tractors with a hydraulic lift) by means of the lever at the rightside control board.

PTO coupler shank speed: Independent drive:

• 540 rpm at 2081 rpm of the diesel engine (MTZ-900/920);

• 540 rpm at 1632 pm of the diesel engine (MTZ-950/952);

• 1000 rpm at 2302 pm of the diesel engine (MTZ-900/920)

• 1000 rpm at 1672 pm of the diesel engine (MTZ-950/952) Synchronous drive: 4.76 revolu- tions/metre of travel with the rear tyres 16,9R38 mounted. Removable PTO coupler shank: in accordance with the SAE standard with 6 splines for 540 rpm and 21 splines for 1000 rpm. Rotation: clockwise as seen from the shaft butt.

Hydraulic system

Type: universal, unit-principal, with in-

dependent power cylinder (MTZ900/920/950/952) or with hydraulic lift, with two self-contained cylinders (MTZ-900.3/920.2/920.3/

950.3/952.2/952.3). Maximum pressure in the hydraulic system: 18...20 MPa. Distributor: spool valve type:

• Р80-3/4-222-ЗГг (Р80-3/4-111-ЗГг op- tional);

• Р70-1221C; RS213 MTZ — for tractors with power governor;

• РП70-1221; RS213 Mita flow-type — for tractors with hydraulic lift. Hydraulic system outlets: two side and one rear outlets (drain one – optional). RMA control system has three operating modes:

• power;

• position;

• high-altitude.

Hydraulic system oil brands:

BECHEM Stariol №32; ADDINAL Hydraulikol HLP 32; THK Hydraulic HLP32.

Rear mounted attachment

Type: three-point mounted system of

category 2

Page 31

Specifications

MTZ series 900

Lifting capacity: 3000 kg at the ends of longitudinal rods

Electrical equipment

Voltage: 12 V. Start system voltage: 12 V or 24 V. Power supply system: two storage bat-

teries, 12 V each, connected in parallel (series connection when starting the engine for supplying the starter with the voltage of 24 V).

Alternator

14 V, 1000 W (1150 W – for MTZ-

900.3/920.3/950.3/952.3).

Lighting system and light alarm:

• front headlights with lower and distance light;

• front and rear work lights;

• clearance and brake lights;

• dashboard, cab and number plate light-

ing;

• emergency warning lights;

• road-train sign.

Pneumatic system

Compressor Type: single-cylinder, air-cooled. Trailer brake control actuator Type: pneumatic, single-ended, inter-

locked with tractor brakes. Twin actuator – for MTZ-

900.3/920.3/950.3/952.3 Pressure restricted by safety valve:

0.65…0.80 MPa.

Wheels

Front:

9.00R20 or 9.0-20 (MTZ900/900.3/950/950.3) main;

13.6-20 (MTZ-920/952) main;

11.2-20 (MTZ-920/952) optional; 360/70R24 (MTZ-920.2/920.3/

952.2/952.3) main. Rear:

16,9R38 (MTZ-920/952) main; 18,4R34 (MTZ- /920.3/952.2/

952.3) main; 18,4R34 (Ф-11) (MTZ-900/

900.3/920.2/950/950.3) main.

Other equipment

Front and rear wipers, cab heating and ventilation system, windshield washer, cab lighting dome, air conditioner (optional).

Page 32

Controls and Instrumentation

MTZ series 900

CONTROLS AND INSTRUMENTATION

1. Cooling system radiator shutter control.

2 . Emergency control lamps switch. 3 . Steering-wheel-mounted multifunction

switch (turn, turn indicators, upper/lower beam).

4. Combination meter.

5. Control lamps block.

6 . Electric tachospeedometer. 7 . Air distributors. 8 . Radio receiver (if installed). 9 . Recirculation shutters.

10. Windscreen wiper switch.

11. Cab fan and heater switch.

12. Rear working lights switch.

1 3 . Front working lights switch. 1 4 . Road-train sign lighting switch.

15. Cab light switch.

16. Control of the left-side outputs of the hydraulic system.

17. Control of the right-side outputs of the hydraulic system.

18. Control of the left rear outputs of the hydraulic system.

1 9 . Tachospeedometer control board. 2 0 . Starter and instrumentation switch.

21. Control of the step-down reduction gear and shuttle gear (if installed).

2 2 . Starting aid switch (for tractors

equipped with an electric torch preheater).

2 3 . Windscreen washer switch. 2 4 . Clearance lights and headlights

switch.

2 5 . Fuel feed control pedal. 2 6 . Right service brake pedal. 2 7 . Left service brake pedal. 2 8 . Rear axle differential lock control.

29. Steering column inclination control.

30. Engine shutdown cord handle

31. Cab heater valve control (if installed).

32. Clutch pedal.

33. Plug.

Page 33

Controls and Instrumentation

MTZ series 900

33. Parking brake lever.

34. Gearbox control lever.

35. Stop bumper of power governor control lever.

36. Fuel feed control arm.

37. PTO control lever.

38. Power governor control arm.

39. Signal switch arm of power and position control sensors (if installed).

40. SB switch (on the MTZ-

900.3/920.3/950.3/952.3 tractors, the SB switch is located under the bonnet in the SB zone)

41. Speed-reducer gear switch arm (if installed).

42. Speed-reducer gear range switch arm (if installed).

43. Control handle of the hydraulic hook claws.

44. PTO switch arm (independent/synchronized).

45. Arm for fixing the hinging mechanism in the lifted position (version with a power governor) .

46. FDA drive control arm.

47. Gearbox control levers.

48. Rear axle differential lock control

49. PTO control

50. Hydraulic hoist control levers

51. Joy stick for remote control of the hydraulic system distributor (if installed)

IMPORTANT! Prior to working on the tractor, study the controls and instrumentation and their functions.

Page 34

Controls and Instrumentation

MTZ series 900

Instrumentation and Switches

Starter and instrumentation switch (1)

Switch (1) has four positions:

• 0 – “Off”

• I – “Consuming units On”

• II – “Starter On” (not fixed)

• III – “ R adio receiver ON” (key turned counter-

clockwise)

Page 35

Controls and Instrumentation

MTZ series 900

1. Instrumentation

The schematics of the instrument dashboards 80-3805010-Д1 and 826-3805010 are giv- en in the section “Appendix”.

The instrumentation includes:

- the combination meter (Р2) with sensors;

- the electric tachospeedometer (Р1) with the control board (А3) and sensors;

- the electric light and audible alarms combined into two pilot lamp units (HG1 and HG2) in the instrument dashboard 80-3805010-Д1 or into the pilot lamp unit and combination meter in the instrument dashboard 826-3805010. To switch on the instruments, turn the starter and instrumentation switch to the “I” position. Then the voltage will be applied to the terminal “K3” of the switch, then to the relay for power supply of the instruments, to the fuse (F2) of the unit and further – to the units (HG1 and HG2), tachospeedometer (Р1), alarm device (НА2), combination meter (Р1) and speed sensors (BV1 and BV2). The instrument pointers shall move to the zero position or to the position corresponding to the true value of the parameter controlled by the system at the moment.

In case of deviation of readings of the instruments from their true values, detect the cause of the fault following the recommendations below.

1.1. Tachospeedometer АР70.3813 (Fig. 1)

Fig. 1. Tachospeedometer (Р1):

1 . Engine crankshaft rotational speed scale, rpm. 2 . PTO II rotational speed scale –1000 rpm. 3 . PTO I rotational speed scale –540 rpm. 4 . PTO rotational speed display (LED). 5 . Engine running hours indication, h. 6 . Tractor speed indication, km/h. 7 . Display of engine running hours and tractor speed, km/h. 8 . Pointer indicator of the engine crankshaft speed (LCD).

The electric tachospeedometer АР703813 installed in the dashboard operates as follows:

• On setting the starter and instrument switch is put to position I when the tractor is stopped, the display (7) shows the engine running hours (5);

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• When the tractor is moving, the display (7) shows the tractor speed indication (6) (km/h), while the indication (5) disappears. The electric signal of the speed comes from the speed sensors mounted on the rear axle cover (BV1, BV2). The speed readings are taken through a signal from the sensor mounted on the pinion of the final drive of the wheel rotating at lesser speed. The calculated speed is higher than the actual one, because no tractor skid is the taken into account;

• On starting the engine, the pointer indicator (8) moves round the index dial (1) to display the rotational speed of the engine crankshaft. At the same time, the display (4) shows the PTO indication (rpm). The scale (3) is assigned to the PTO I and the scale (2) – to the PTO II. The electric signal of the rotational speed is taken from the phase winding of the alternator.

1.2. Tachospeedometer control board (Fig. 2)

The control board is installed in the dashboard and serves for programming the tachospeedometer to the specific model of the MTZ tractor.

Fig. 2. Control board (А3):

1 – Button for setting the tachospeedometer to the programming mode and selecting the programming parameter on the tachospeedometer display (7). 2 – Button for selecting the value of the coded parameter shown on the display (7)

1.3. Programming the tachospeedometer АР70.3813 ATTENTION! The tachospeedometer has been programmed just to your tractor make at

the factory. Re-programming is required in case of tyre type changing. Do not re-program the tachospeedometer, if unnecessary.

The tachospeedometer shall be programmed to ensure the correct display of the following tractor’s parameters: engine rotational speed, tractor motion speed and PTO rotational speed (540 and 1000 rpm).

Programming procedure:

– Remove the control board cover; – Press the button (1) to enter the programming mode (Fig. 2).

1. To ensure the correct display of the tractor motion speed, it is necessary to program the tachospeedometer to the number of teeth of the pinion at the place of installation of the speed sensors (parameter “Z”) and rear wheel rolling radius (parameter “R”). To do this:

– press the button (1) of the board and call the parameters “Z” and “R” in turn to the display (3) of the tachospeedometer (4);

– press the button (2) of the board and set the number of teeth (Z) according to Table 1 and value Rk according to Table 2:

PARAMETER VALUE

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Table 1

Number

of teeth

(Z)

Tractor make

MTZ 590; 80.1; 890; 900; 922; 950

Table 2

Tyre

mark

16,9R30

18,4L30

15,5R38

9,5-42

18,4R34

(Ф-11)

16,9R38

18,4R38

Rk, m

0.698

0.720

0.755

0.730

0.770

0.800

0.830

Number

coded

700

720

755

730

770

800

830

3. To ensure the correct display of the engine and PTO rotational speeds (540 and

1000), program the engine make (parameter “D”):

– press the button (1) and call the parameter “D” to the tachospeedometer display (3); – press the button (3) and set the necessary engine make according to Table 3:

Table 3

Engine make

Д-243

Д-244

Д-245

Д-

245.5

Rated rotational

speed, rpm

2200

1700

2200

1800

Number pro-

grammed

243

244

245

245.5

On the expiry of seven seconds after programming, the instrument returns automatically to the operating mode. Refit the board cover.

Note: If no information on the type of the tyre fitted is available, it is allowed to measure the value Rk as a distance from the wheel axis to the ground prior to beginning the operation of the tractor.

1.4. Connecting the tachospeedometer To connect the tachospeedometer to the instrumentation system, a 9-contact block is provided on the rear panel of the instrument (Fig. 3).

Fig. 3

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The identification of the block pins is given in Table 4. Table 4

Identification

to the terminal “–“

to the power supply unit “+12В”

to the board output “Parameter selection”

to the board output “Parameter value”

to the board output “Mode”

to the speed sensor BV2 (left wheel)

to the speed sensor BV1 (right wheel)

to the phase winding “W” of the alternator

to the instrument backlight lamps

1.5. Tachospeedometer diagnostics and troubleshooting

1. No instrument backlight:

Check the power supply wire connected to the pin “9” of the 9-contact block of the instrument (Fig. 3) – check if the backlight lamps are intact.

2. Jerking and jumps of the pointer of the engine rotational speed indicator over the dial: poor contact on the alternator terminal and, therefore, poor signal from the

phase winding of the alternator. Repair.

3. Jerking of the pointer and understating the reading of the engine rotational speed:

- Check and adjust the tension of the alternator driving belt.

4. Over- or understated readings of the engine and PTO’s rotational speeds (with the normal movement of the pointer):

- Check the correctness of programming the instrument according to the engine make (parameter “D”): (see item 1.3);

5. The counter of astronomical hours of the engine running fails to accumulate the operating time: Check the connection of the wire to the contact “8” of the instrument block and the presence of the frequency signal from the phase winding of the alternator.

6. Over- or understated readings of the tractor speed:

- Check the correctness of the instrument programming according to the rolling radius of the rear wheels (Rk) (see item 1.3);

- Check the correctness of the programming according to the number of teeth of the halfaxle pinion (Z) (see item 1.3).

7. No readings of the tractor motion speed: Check the presence of signals from both the speed sensors (BV1, BV2).

8. The readings “02…07” km/h appear on the instrument indicator when the tractor is moving:

- the numbers “02…07” and, 12 seconds later, “0” appear from the right side of the scale – no signal from the right speed sensor (BV1).

- the numbers “02…07” and then “0” appear from the left side of the scale – no signal from the left speed sensor (BV2).

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1.6. Combined indicator КД 8083

Fig. 4. Tachospeedometer (Р1):

1 – Engine rotational speed indicator (pointer indicator). 2 – PTO 1000 rotational speed scale (opposite to the respective value of the PTO ro-

tational speed).

3 – PTO 540 rotational speed scale (opposite to the respective value of the PTO rota-

tional speed).

4 – Five-digit indicator. 5 – LED’s lighting up in the mode of programming the coefficients “K”, “R” and “Z”

(opposite to the respective LED).

6 – LED’s lighting up in the mode of display of the motion speed “km/h” and total en-

gine running time “h” (opposite to the respective LED).

7 – Alarm of the overvoltage in the tractor on-board power system (red) operates, if

the voltage exceeds 18.5 V.

In this case the instrument is switched off because the protective device operates. Should the voltage

drop down to 16.5 V, the indicator returns to the operating state and the overvoltage indicator goes out.

Indicator operating procedure

On switching on the power supply, the indicator is switched to the main operating mode. In case of absence of signals from the speed sensors the digital indicator (4) shows the reading of the total engine running time and the LED located next to the symbol “h” lights up. Total engine running time:

Appearance of the pulses from the speed sensors at the input of the pulse indicator causes the switching-on to the motion speed indication mode. Then the measured calculated speed reading is shown on the digital indicator and the LED located next to the symbol “km/h” lights up. The calculated motion speed (km/h).

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1.7. Programming the indicator КД8083

Programming procedure:

- remove the control board cover;

- press the button (1) of the control panel and hold it down for at least 2 seconds;

- the display (7) shows the mode “Adjusted total engine running time”. In this case, the LED located next to the symbol “Т” lights up.

- press repeatedly the button (1) to switch over cyclically the programmable parameters;

- press the button “2” to enter the required value of the selected parameter, then the least significant digit (the first on the right) of the selected parameter of the indicator starts blinking with the period of 0.3 s;

- set the required value of the less significant digit of the selected parameter by pressing the button “2”;

- press shortly the button “1”; then the second from the right digit of the digital indicator shall start blinking;

- set the required value in the second from the right digit of the parameter to be corrected by pressing the button “2”;

- press shortly the button “1”; then the third from the right digit of the digital indicator shall start blinking;

- set the required value in the third from the right digit of the parameter to be corrected by pressing the button “2”;

- fix the entered value of the parameter by pressing the button “1”;

- on pressing the button “1” next time, the switching to the next parameter will occur. To exit the programming mode, enter the adjusted time mode, press and hold down the button (2) for at least 2 s; then the readings “8.8.8.8.8” shall be shown in the five-digit indicator for 1-4 seconds and all the LEDs of the PTO’s scales shall light up.

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1. To display correctly the tractor motion speed, it is necessary to program the following parameters in the following order:

2. Gear ratio of the wheel reduction gear (parameter “K1”) from Table 5:

Table 5

Gear ratio of the wheel reduction

gear (K1)

Tractor make

1.00

MTZ 590; 80.1; 890; 900; 922; 950

according to the number of teeth at the place of installation of the speed sensors (parameter “Z1”) from Table 6:

Table 6

Number

of teeth

(Z1)

Tractor make

MTZ 590; 80.1; 890; 900; 922; 950

rear wheel rolling radius (parameter “R”) from Table 7:

Table 7

Tyre

mark

16,9R30

18,4L30

15,5R38

9,5-42

18,4R34

(Ф-11)

16,9R38

18,4R38

Rk, m

0.698

0.720

0.755

0.730

0.770

0.800

0.830

Number

coded

700

720

755

730

770

800

830

2. To display correctly the engine rotational speed, it is necessary to program the gear ratio of the alternator drive (parameter “K2”) from Table 8 in the specified order:

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Table 8

Gear ratio of the alternator

drive (K2)

Engine mark

2.36

Д-242

Д-243

Д-245

Д-

245.5

3. To display correctly the PTO’s rotational speed (540 and 1000), it is necessary to program the gear ratios of the PTO 540 “K3” and PTO 1000 “K4” from Table 9 and the number of teeth of the pinion at the place of installation of the PTO sensor “Z2” in the specified order:

Table 9

The gear ratio of

the PTO drive

Engine mark

Д-242

Д-243

Д-245

Д-

245.5

540 (K3)

0.33

0.26

0.33

1000 (K4)

0.60

0.46

0.60

- in case of absence of the PTO rotational speed sensor (from the phase winding of the alternator serves as that for indication of the PTO rotational speed), the entered value of the parameter “Z2” shall be equal to 0.

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1.8. Indicator Diagnostics and Troubleshooting

1. The diagnostics of the faults according to items 1-3 and 5 is similar to that of the tachospeedometer;

2. Over- or understated readings of the engine rotational speed and PTO’s rotational speed (with the normal movement of the pointer):

Check the correctness of programming the instrument according to the gear ratio of the alternator drive (parameter “K2”): (see item 1.7);

3. Over- or understated readings of the tractor speed:

1. Check the correctness of programming the instrument according to the rolling radius of the rear wheels (R) (see item 1.7);

2. Check the correctness of programming according to the number of teeth of the halfaxle pinion (Z1) (see item 1.7);

3. Check the correctness of programming of the gear rate of the wheel reduction gear (K1) (see item 1.7).

4. No readings of the tractor motion speed:

Check the presence of the signals from the both speed sensors (BV1, BV2).

5. Signalling of operation of the speed sensor in case of absence of a signal from one of them:

a) in case of absence of the signal from the right wheel speed sensor (BV1), the symbol “□” is displayed on the right of the digital indicator within 12 s after starting the motion; check the connection and serviceability of the right wheel speed sensor; b) in case of absence of the signal from the left wheel speed sensor (BV2), the symbol

“□” is displayed on the left of the digital indicator within 12 s after starting the motion;

check the connection and serviceability of the left wheel speed sensor.

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1.9. Combined indicator АР80.3813 and combined indicating unit КД8105 (mounted on the tractors with the instrument dashboard 826-3805010)

The combined indicator (hereinafter referred to as the CI) and the control board (hereinafter referred to as the CB) monitor the operational parameters of the systems and units of the MTZ tractors and provide the operator with the information on malfunction or failure of a particular system. The CI includes the indicators and alarm lamps monitoring the following parameters:

Р1 – speed indicator (pointer-type); Р2 – engine rotational speed indicator (pointer-type); РS1 – LCD, multifunction indicator (for the description and principle of operation of the РS1 in more detail, see below) РS2 – PTO rotational speed indicator (light indicator);

HG1 – pilot lamp-alarm of the overvoltage in the on-board power supply system (red); HG2 – pilot lamp-alarm of the parking brake application (red); HG3 – pilot lamp-indicator of switching on the turn indicators of the tractor (green); HG4 – pilot lamp-indicator of switching on the turn indicators of the trailer (green); HG5 – pilot lamp-indicator of switching on the upper beam of the headlights (blue); HG6, HG10 – PTO scale segments (yellow); HG7… HG9 – PTO scale segments (green);

HG11, HG12 – scale range indicator of the PTO 1000 and 540, respectively (yellow);

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Operating principle of the PTO rotational speed indicator:

1. In the absence of the PTO rotational speed sensor, the designations of the “540” and “1000” scales as well as the indicator of the scale ranges HG11, HG12 light up simultaneously on starting the engine (when a signal comes from the phase winding of the alternator).

The indication of the PTO scale segments (with the account of the selected value of the coefficient “KV2”) occurs on reaching the calculated PTO rotational speed equal to 750 (rpm).

For reference: the indication of the PTO scale segments occurs on reaching the engine rotational speed of 1400-1500 (rpm) and more.

Here, depending on the selected PTO speed mode (540 or 1000), the lit PTO scale segments designate the rotational speed values according to Table 10.

Table 10

Values of operation of the

“1000” scale segments

(rpm)

Segment location on the

scale

Values of operation of the

“540” scale segments

(rpm)

1150

HG6

650

1050

580

950

HG8

500

850

420

750*

HG10

320

2. In the presence of the PTO rotational speed sensor installed over the pinion of the PTO shank, the combined indicator selects automatically the range (320-750 or 750-

1250) depending on the rotational speed of the shank that is accompanied visually by switching on the backlight of the digital designation of the scale – “540” (HG11) or «1000» (HG12), here the threshold values of operation of the scale segments change in accordance with the requirements of Table 10.

The five LED 5 scale segments (HG6 … HG10) of the PTO light up starting from the bottom one including the segment with the current value of the PTO rotational speed included in the range of the lit state of that segment.

Notes:

- (*) is the rotational speed value, at which the “1000” scale designation is switched on;

- the “540” scale designation is only switched on in the presence of the signal from the sensor and switched on switching on the “1000” designation or in case of absence of the signal for more than 3 s.

- the exact value of the PTO rotational speed can be seen on the indicator РS1. РS1, the LCD multifunction indicator displays simultaneously:

1. Digital designation of the position of the gearbox control level (digits from 0 to 6) or lettering of the reduction gear switch (letters L, M, H, N);

2. Current numerical value of one of the parameters of the tractor systems.

The combined indicator receives the information on the position of the gearbox control lever from the

transmission control unit (if the complex electronic control system (CECS) is available) or

LCD information fields

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from the control unit of the range reduction gear (if provided). This parameter is displayed

on the information field “1”. If the control units are absent or not connected or in case of wire breakage, the letter “A” is displayed in the information field “1”.

The information field “2” displays the following parameters:

1. Total astronomic time of running the engine in hours.

The counter accumulates the information on the total engine running time and saves the same on switching off the power supply. The reading range is from 0 to 99999 hours of the engine running.

2. PTO rotational speed:

In this mode, the PTO rotational speed is displayed in the digital form depending on the signal from the PTO rotational speed sensor. The mode is active if the tractor is equipped with the PTO rotational speed sensor.

3. Volume of the fuel remaining (if the frequency fuel volume sensor FFVS is provided):

In this mode, the current volume of fuel in the tank (in litres) is displayed. Attention! This mode is only available on the stopped tractor in the absence of signals from the speed sensors.

NOTE. To switch over between the indication modes “Total astronomic time of running the engine”, “PTO rotational speed”, “Volume of the fuel remaining” and fault messages, press the “Mode” button of the control panel.

Operating principles of the pilot lamps

HG1 is the indicator of the overvoltage in the on-board power supply system:

It lights up when the voltage of the on-board power supply system of the tractor exceeds 19 V and goes out when the power supply voltage level drops down to 17 V;

In this case the CI is fully de-energized and restores its serviceability when the voltage

drops down to the rated value. HG2 is the indicator of the parking brake application:

The “Parking brake” (Стояночный тормоз) indicator starts blinking on operation of the

parking brake switch; HG3, HG4 is the indicator of switching on the turn indicators of the tractor and trailer:

It blinks when the right or the left turn indicator is switched on by the steering-wheel-

mounted multifunction switch.

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HG5 is the indicator of switching on the upper beam of the road headlights; it lights up when the upper beam of the road headlights is ON.

Note! The indicators light up and go out synchronously with the changes in the states of the system sensors.

Indicator control board

The programming board makes it possible to perform the manual programming of the combined indicator by means of the “Parameter” (Параметр) and “Value” (Значение) buttons and to modify the mode of display of the parameters to be shown on the LCD.

The diagnostic connector ХР1 located on the front panel of the control board makes it possible to perform the automatic programming (reprogramming) of the CI by means of a special instrument (if provided). Should such an instrument be unavailable, the programming shall be performed by means of the above buttons.

1.10. CI programming procedure

1. On selecting the fixed value of the programming parameter:

1.1. On pressing the “Parameter” (Параметр) button for the first time, the LCD is switched to the mode of viewing the parameter to be programmed and its numerical value. On pressing this button repeatedly, the parameters are switched over cyclically.

1.2. On pressing successively the “Parameter” (Параметр) button, the numerical value of the set parameter to be programmed changes.

1.3. The mode is exited automatically if neither “Parameter” (Параметр) nor “Value” (Значение) button has been pressed within 7.0 sec. On exiting the mode, the last values of the parameters selected by the “Value” (Значение) button are saved.

2. When entering the unfixed value of the programming parameter:

2.1. Select the parameter, the values of which shall be set, by means of the “Parameter” (Параметр) button;

2.2. Press twice the “Mode” (Режим) button; the least digit of the numerical value starts blinking;

2.3. To change the value of the blinking digit of the parameter, use the “Value” (Значение) button;

2.4. To go to the more significant digit, press the “Parameter” (Параметр) button;

2.5. To exit the mode of programming an unfixed value of any parameter, press twice the “Mode” (Режим) button;

2.6. On exiting the above mode, the digits of the entered value of the parameter become lit steadily;

2.7. The newly entered value is set the last in the list of the parameter values allowed to be programmed;

MODE VALUE

PARAMETER

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Entering the parameters to be programmed:

1. To display correctly the tractor motion speed, it is necessary to program in the specified order the following parameters:

Parameter “Z” is the number of teeth of the pinions of the final shafts of the driving wheels (right and left), over which the (rotational) speed sensors are installed;

Select from the Table:

Number of teeth (Z)

Tractor make

MTZ 590; 80.1; 890; 900; 922; 950

Parameter “I” is the multiplying factor of the gear rate of the wheel reduction gear;

Select from the Table

Gear ratio of the wheel reduction gear (I)

Tractor make

1.000

MTZ 590; 80.1; 890; 900; 922; 950

Parameter “R” R is the rear wheel rolling radius (mm);

Select from the Table

Tyre mark

16,9R30

18,4L30

15,5R38

9,5-42

18,4R34 (Ф-11)

16,9R38

18,4R38

Rk, m

0.698

0.720

0.755

0.730

0.770

0.800

0.830

Number coded

700

720

755

730

770

800

830

2. To display correctly the engine rotational speed, it is necessary to program in the specified order the gear ratio of the alternator drive (parameter “K”) from Table 8-6:

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Select from the Table

Gear ratio of the alternator

drive (К2)

Engine mark

2.36

Д-242

Д-243

Д-245

Д-

245.5

2.41

D-260

3. To display correctly the PTO’s rotational speeds (540 and 1000), it is necessary to program the gear ratio PTO “КV2” and the number of teeth of the pinion at the place of installation of the PTO sensor “ZV” in the specified order:

Select from the Table

Gear ratio of the

PTO drive

Engine mark

Д-242

Д-243

Д-245

Д-

245.5

(КV2)

0.60

0.46

0.60

- in the absence of the PTO rotational speed sensor (the signal from the phase winding of the alternator serves as a signal for indication of the PTO rotational speed) the value of the parameter “ZV” to be entered shall be equal to 0.

4. To display correctly the residue of fuel in the tank (if the FFRS sensor is installed), it is necessary to program the fuel tank volume “V” in the specified order:

For tractors with plastic fuel tank, set the value of 140 litres. Also, when pressing the “Parameter” (Параметр) button in the programming mode, the

list of programmable parameters displays the independent parameter of the adjusted content of the counter of the astronomic time of running the engine. This parameter is unavailable for measurement; it presents the precise (to 1/10 hours) value of the number of hours of the engine running.

On switching on the backlight of the instrument scales (the main light switch (MLS)

is set to the positions II “The backlight of the instrument dash and clearance lights are

ON” and III “The consumers of the position II and front road headlights and clearance lights are ON”), the brightness of the PTO indicator segments and LCD is automatically

reduced.

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IMPORTANT! Each time the power supply of the CI is switched ON, the functioning of the pointer indicators and PTO indicator scale elements is tested. Within one second after this, the indicator pointers deviate from the initial marks beyond the following first marks of the scales (beyond “5” for the motion speed and beyond “10” for the rotational speed), and all the segments and designations “540” and “1000” of the PTO scale are switched on.

1.11. Connecting the tachospeedometer

To connect the tachospeedometer to the instrumentation system, a 13-contact block (ХР1) and a 9-contact block (ХР2) are provided on the rear panel of the instrument (Fig.

5).

Fig. 5 The identification of the pins of the blocks is given в Tables (11) and (12). Table 11

Contact

Address of the XP1 connector pin

To the terminal “–“ (common)

To the power supply unit “+12 V”

To the rotational speed sensor “PTO”

To the rotational speed sensor “Left wheel”

To the rotational speed sensor “Right wheel”

7 8

To the phase winding of the alternator

To the switch of the backlight

To the switch of the headlight upper beam

To the switch of the trailer turn indicators

To the switch of the parking brake

To the switch of the tractor turn indicators

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Table 12

Contact

Address of the XP2 connector pin

To the terminal “–“ (common)

To the control board contact “Indication Mode”

To the control board contact “Parameter Selection”

To the control board contact “Parameter Value”

5 6 7

To the fuel volume sensor

To the control board contact “M”

To the control board contact “+UBZ”

1.12. Indicator Diagnostics and Troubleshooting

1. No instrument backlight:

Check the power supply voltage at the pin “9” of the 13-contact of the contact block (ХР1) of the instrument (Fig. 5);

2. Jerking and jumps of the pointer of the engine rotational speed indicator over the dial: poor contact on the alternator terminal and, therefore, poor signal from the

phase winding of the alternator. Repair.

3. Jerking of the pointer and understating the reading of the engine rotational speed:

- Check and adjust the tension of the alternator driving belt.

4. Over- or understated readings of the engine and PTO’s rotational speeds (with the normal movement of the pointer):

- Check the correctness of programming the instrument according to the gear ratio of the

alternator drive (parameter “K”): (see item 1.10);

5. The counter of astronomical hours of the engine running fails to accumulate the operating time:

- Check the connection of the wire to the contact «8» of the instrument block (ХР1) and the presence of the frequency signal from the phase winding of the alternator.

6. Over- or understated readings of the tractor speed:

1. Check the correctness of the instrument programming according to the rolling radius of the rear wheels (R) (see item 1.10);

2. Check the correctness of the programming according to the number of teeth of the half-axle pinion (Z) (see item 1.10).

3. Check the correctness of programming the multiplying factor of the gear rate of the wheel reduction gear (I) (see item 1.10).

7. The “FUEL” reading appears on the indicator display

Check the connection and serviceability of the frequency fuel volume sensor (FFVS) to the contact “7” of the block (ХР2).

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8. No readings of the tractor motion speed:

- Check the presence of the signals from the both speed sensors (BV1, BV2).

9. The “0km/h----” or “----0кm/h” readings appear on the indicator display within 1012 s after starting the motion of the tractor:

- no signal from the left speed sensor (BV2) check the serviceability of the sensor.

- no signal from the right speed sensor (BV1) check the serviceability of the sensor.

ATTENTION! The speed readings are affected considerably by the speed sensor setting and adjustment performed when replacing or repairing the speed sensor. The gap “S” between the end face of the sensor (2), Fig. …, and projection of the tooth of the final pinion (6) of the rear axle shall be as specified in Table … below

A brief message about faults (Example: 0----, FUEL) is shown according to the priority on the LCD regardless the information displayed. On pressing successively the “Mode” (Режим) button, the messages shall be paged. When viewing the last message and pressing repeatedly the “Mode” button, the LED is switched to the mode of displaying over the cycle of the operating parameters specified below. The faults are displayed on the LCD each time the instrument is switched on until the fault is eliminated.

Note:

- On switching on the power supply of the CI, the LED shows the information in the indication mode selected until the power supply of the CI is switched off in case of absence of the messages about faults.

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1.13. Setting and Adjustment of the speed sensors (BV1, BV2) (Fig. 6)

The speed sensors (2) are fastened by means of the bolts (3) to the cover of the rear axle housing (1) in the zone of the left and right final pinions (6) of the final drives.

The gap “S” between the end face of the sensor and projection of the tooth of the final pinion shall be adjusted by means of the spacers (5) as follows:

1. Measure the dimension “Н” from the sur- face of the cover (1) to the tooth projection;

2. Select and place the necessary number

of spacers for setting the gap “S” corre- sponding to the measured value “Н”

(see Table 13);

Install the ground wire (4) and tighten the bolts (3).

Table 13

Н,

Number

of spacers (Pos. 5)

Note

11.25-12

1.05-

1.6

When using the cover (1) with the thickness S=6 mm

12.1-13

0.8-1.8

13.1-

13.73

0.9-

1.53

13.25-14

1.05-

1.8

When using the cover (1) with the thickness S=8 mm

14.1-

15.73

0.9-

2.53

Fig. 6. Setting the speed sensors: 1 – cover of the rear axle cover; 2 – speed sensor (BV1, BV2); 3 – bolt; 4 – ground wire; 5 – adjusting spacers; 6 – final pinion.

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1.14. Combination meter (Fig. 7)

The combination meter includes the five gauges (1, 2, 3, 4, 5) monitoring the various parameters of the tractor. All the gauges are provided with emergency control lamps. The gauges (1, 2, 3, 5) have the red control lamps, and the indicator (4) – the yellow control lamp. To switch on the combination meter, turn the key of the starter and instrumentation switch (SA6) to the “I” position. In this case, the pointer of the oil pressure indicator (2) and temperature indicator (1) shall move to the zero marks of the scale and the pointers of the air pressure indicator (3), fuel level indicator (4) and voltage indicator (5) shall be set to the positions corresponding to the actual positions of the parameter monitored. The electrical circuit of the instruments is protected by the fuse “2” in the unit (F2).

Engine cooling fluid temperature indicator (1) with the emergency temperature control

lamp (red). It operates with the temperature sensor (BK1). The indicator scale has three zones:

– operating – 80…100°C – green; – non-operating – 40…80°C – yellow; 100…120°C – red.

Engine oil pressure indicator (2) with emergency pressure drop control lamp (red). It operates with the pressure sensor (BP1). The indicator scale has three zones:

– operating – 100…500 kPa – green; – non-operating – 0…100 kPa and 500…600 kPa – red.

When starting the cold engine, the pressure of up to 600 kPa is possible.

Indicator of the air pressure in the pneumatic system (3) with the red emergency pressure control lamp. It operates with the air pressure sensor (ВР2). The indicator scale has three zones:

- operating – 500…800 kPa – green;

- non-operating – 0…500 kPa and 800…1000 kPa – red.

Fig. 7. Combination meter: 1 – engine cooling fluid temperature indicator; 2 – indicator of the engine oil pressure; 3 – indicator of the air pressure in the pneu- matic system; 4 – indicator of the fuel level in the tank; 5 – indicator of voltage of the storage battery or alternator.

Scale zones marked by hatching: – red – yellow

– green – orange

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Controls and Instrumentation

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Indicator of the fuel level in the tank (4) with orange control lamp of reserve level. It operates with the fuel level sensor (BN1). The instrument has the points: 0-1/4-1/2-3/4-

1. Do not allow consuming the fuel to empty tank (instrument pointer is at orange zone).

Voltage indicator (5) with the red control lamp red of additional SB charging.

It displays the SB voltage, when the engine is running and the starter switch key is in the “I” position. When the engine is running, it indicates the voltage at the generator terminals.

The reading values are given in Table 14 below.

Table 14

Scale zone, col-

our

Power supply system state

when the engine

is running

when the engine

is not running

13.0 – 15.0 V green

Normal charging mode

10.0 – 12.0 V red

Generator is not working

SB is run down

12.0 – 13.0 V yellow

No charging of SB (low charging voltage)

SB has normal charging

15.0 – 16.0 V red

SB overcharging

SB has normal charging

White hairline in yellow zone

The rated emf of the SB is12.7 V

1.15. Connection the combination meter

To integrate the combination meter to the instrumentation system, the rear panel is provided with two blocks Х1 and Х2 (Fig. 8).

The purpose of the contacts of the blocks of the combination meter is shown in Tables 15, 16.

Fig. 8. Blocks for connecting the combination meter (rear view):

Х1 – 9-contact block; Х2 – 7-contact block.

Block Х 1

Table 15

Contact

Address

To the instrument backlight switch

To the “–” terminal of the battery

Monitoring the storage battery charging

Buzzer

To the sensor of the oil pressure in the engine (ВР1)

To the sensor of the emergency temperature of the engine cooling fluid (SК1)

To the sensor of the emergency oil pressure in the engine (SP2)

To the sensor of the cooling fluid temperature (BK1)

To the “+” SB terminal (12 V)

Block Х2

Table 16

Contact

Address

Reserved

To the fuel level sensor (BN1)

To the gearbox oil pressure sensor (not used)

To the sensor of emergency drop of the air pressure (SP4)

To the sensor of the reserve fuel level (BN1)

To the sensor of the air pressure (ВР2)

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Controls and Instrumentation

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1.16. Combination Meter Diagnostics and Troubleshooting

1. No backlight of the instrument scales on setting the SA10 central light switch:

1. Check the presence of the power supply voltage at the terminal “1” of the block “Х1” (to the instrument backlight switch) and at the terminal “9” (to the power supply unit “+ 12 V”). In case of absence of the voltage, eliminate the open circuit. If the voltage is present:

2. Check the intactness of the backlight lamps and replace them, if necessary.

2. The temperature indicator (1), Fig. 9, operated jointly with the thermistor-type temperature sensor BK1 (ДУТЖ-02М, resistance range: 243…22.5 Ω).

2.1. The temperature indicator pointer goes off-scale:

1. Breakage of the wire to the terminal “9” of the block “Х1” (“+” 12 V of the SB);

2. Breakage of the wire to the terminal “2” of the block “Х1” (“–” of the power supply);

3. If there is no breakage, the temperature indicator is faulty.

2.2. The pointer of the temperature indicator is set before the initial point of the scale:

1. Breakage of the wire to the terminal “9” of the block “Х1” (“+” 12 V of the SB);

2. Breakage of the wire to the terminal “8” of the block “Х1 ” (to the temperature indicator BK1);

3. Fault of the temperature sensor;

4. Fault of the temperature indicator.

3. Indicators of the oil pressure in the engine (2) and air pressure in the pneumatic system (3). They operate from the following sensors: Rheostat-type oil pressure (ВР1) (ДД-6М;

10…184 Ω) and rheostat-type oil pressure (ВР2) (ДД-10-01М).

3.1. The indicator pointer is set before the initial point of the scale:

1. Breakage of the wire to the terminal “2” of the block “Х1” (“–” of the power supply);

2. Breakage of the wire to the terminal “9” of the block “Х1” (“+” of the power supply);

3. If there is no breakage, the pressure indicator is faulty.

Fig. 9.

IMPORTANT! To avoid errors in the temperature indication, use the ДУТЖ – 02М temperature sensors mentioned above.

3.2. The indicator pointer goes off-scale:

1. Breakage of the wires to the terminals “4”, “5”, “7” of the block «Х1» or short circuit inside

the indicator;

2. The pressure indicator is faulty.

4. Fuel level indicator (4).

It operates with the float-type rheostat sensor (BN1) installed in the fuel tank (ДУМП-21М (320…0 Ω)).

NOTE! Should there be no fuel in the tank when switching on the indicator; the indicator pointer shall be at the initial point of the scale. If the indicator is switched off or there is a wire breakage, the indicator pointer shall go off-scale.

4.1. The indicator pointer is before the initial point of the scale:

1. Breakage of the wire to the terminal “9” of the block “Х1” (to the terminal “+12V”);

2. Breakage of the wire to the terminal “3” of the block “Х2” (to the fuel level sensor);

3. The fuel level sensor is faulty; if there is no breakage and the sensor is in good repair, replace the combination meter

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Controls and Instrumentation

MTZ series 900

or repair the fuel level indicator.

4.2. The indicator pointer goes off-scale:

1. Breakage of the wire to the terminal «2» of the block “Х 1 ” (output “–“ of the power supply);

2. If there is no breakage, the fuel level indicator is faulty. Repair the indicator or replace the combination meter.

Front windscreen washer switch (1) Pressing the button (1) switches the

windscreen washer on. Three-position light switch (2)

The button (2) has three positions:

• “OFF”;

• “Dashboard lighting, clearance lights and number plate light ON” ;

• “All control lamps units including the front headlights ON” .

Fault signalling switch (3) Pressing the button (3) switches the

fault signalling on. There is a control lamp inside the button, which blinks simultaneously with the flashing light signalling.

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Controls and Instrumentation

MTZ series 900

Steering-Wheel-Mounted (Multifunction)

switch (1)

It ensures the switching-on of the turn indicators, toggling the beam of the road

headlights (lower/upper beam), warning by

upper beam warning and horn beep.

Turn indicator

Turning the arm (1) up or down switches on the right or left turning indicator, respectively.

NOTE: After completing the turn of the tractor, the arm (1) is returned automatically to the neutral position.

Upper/lower beam

When the road headlights are switched on by the switch (2), pushing the arm (1) switches the “upper beam” o n and pulling the same switches the “lower beam” on. Pulling the arm (1) further from the “lower

beam” position towards the operator up to

the stop switches on shortly the upper beam (no n -fixed position) .

Horn beep

Pressing the arm (1) in axial direction switches the beep on.

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Controls and Instrumentation

MTZ series 900

Front windscreen wiper switch (1)

Pressing the button (1) switches front windscreen wiper on.

The switch has three positions:

• OFF;

• Low speed ON;

• High speed ON.

NOTE: In the “OFF” position wind- screen wiper automatically returns to initial position

Cab heater and fan switch (2)

Pressing the button (2) switches the cab air ventilation on.

The switch has 3 positions:

• “OFF”;

• “Low air supply mode ON”;

• “High air supply mode ON”.

Rear working lights switch (3)

Pressing the button (3) switches the rear working lights on or off. The lights being on, the button (3) is illuminated with a built-in backlight lamp.

Front working lights switch (4)

Pressing the button (4) switches the front working lights on or off. The lights being on, the button (4) is illuminated with a built-in backlight lamp.

Road-train sign lighting switch (5)

On pressing the button (5), the three orange lights on the roof forepart are switched on and the button is backlit.

Radio receiver switch

(if installed)

1 – On (Off) and volume control; 2 – Tuning.

NOTE: The radio receiver operates only in starter key positions I or III only.

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Controls and Instrumentation

MTZ series 900

Control lamps of the dashboard (dashboard 80-3805010-Д 1 )

1 and 14 – Buttons for testing the ser- viceability of the control lamps unit. On pressing the button, all the lamps shall be lit.

2 – Air filter blocking. The control lamp (orange) lights up when the maximum allowed level of filter blocking is exceeded and it needs cleaning.

3 – Reserved. 4 – Engine start lamp: This orange con-

trol lamp lights up on turning the starter switch key to position II to indicate that the starting system functions properly. If the lamp blinks at the frequency of 1.5 Hz, the gearbox control lever is not in neutral position or the engine starting locking switch circuit is out of order. If the lamp blinks at the frequency of 3.0 Hz, there is a failure in the alternator phase winding circuit. Eliminate the fault and restart.

5 – Starting aid lamp: This orange control lamp is on when pressing the button of electric torch pre-heater (ETP). After 30 s the lamp will start blinking, indicating that diesel engine starting system under cold conditions is ready for operation.

6 – HPS emergency oil pressure. The lamp (red) lights up when oil pressure in HPS feeding system is below the allowable level.

7 – Reserved. 8 – Upper beam indicator: Blue control

lamp lights up when switching on the upper beam of the front headlights.

9 – Rear axle differential locking control lamp. The lamp (green) is on when switching automatic differential locking (ADL).

10 – Reserved. 11 – Tractor turn indicator (green). 12 – Trailer turn indicator (green). 13 – Parking brake indicator (red).

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Controls and Instrumentation

MTZ series 900

Control lamps of the dashboard (dashboard 826-3805010)

1 – Reserved indicator (green) 2 – Reserved indicator (green) 3 – Reserved indicator (red) 4 – HPS emergency oil pressure. The

lamp (red) lights up when oil pressure in HPS feeding system is below the allowable level.

5 – Air filter blocking. The control lamp (orange) lights up when the maximum allowed level of filter blocking is exceeded and it needs cleaning.

6 – Reserved indicator (blue). 7 – Rear axle differential locking control

lamp. The lamp (green) is on when switching automatic differential locking (ADL).

8 – Starting aid lamp: This orange control lamp is on when pressing the button of electric torch pre-heater (ETP). After 30 s the lamp will start blinking, indicating that diesel engine starting system under cold conditions is ready for operation.

9 – Reserved indicator (red). 10 – Reserved indicator (red).

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Controls and Instrumentation

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Fuses

Three electric circuit fuse boxes are installed in the dashboard. To get access to the fuses, remove the screw on the dashboard cover and open it.

The fuses protect the following electric circuits of the tractor against overloads:

1 – Braking signal (15 A); 2 – Cab light and rear working lights ( 1 5

A) ; 3 – Fault signalling (15 A); 4 – Windscreen wiper and washer (15 A); 5 – Horn (7.5 A); 6 – Upper beam of the road headlights (15 A); 7 – Left clearance lights (7.5 A); 8 – Right clearance lights and backlights of the dashboard and registration plate (15 A); 9 – Lower beam of the left road head-

light (7.5 A);

10 – Lower beam of the right road head-

light (7.5 A);

11 – Instrumentation, control lamps

block, parking brake indicator (7.5

A); 12 – Turn indicator relay (7.5 A) ; 13 – Front working lights (25 A); 14 – HMS supply (25 A); 15 – Side board supply (PTO, DL) (15

A); 16 – Heating system fan (25 A).

The storage battery charging circuit is protected with the fuse rated at 60 A.

WARNING! To prevent the electric wiring from burning, never apply fuses of higher current rating than specified above. If the fuse blows often, detect the reason and eliminate it.

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Controls and Instrumentation

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In case of blowing of the fuse due to a short circuit, proceed as follows:

1. Connect the wires from the pilot lamp to the terminals of the fuse box at the place of the fuse blown.

a) If there is a short circuit, the lamp will be lit with incandescence, b) If the circuit and consumer are intact, the lamp will not be lit or will be lit dimly.

2. Connect the circuit from the fuse to the consumer and ensure that the lamp is not lit or is lit dimly (in the presence of a switched on consumer in the circuit);

3. Fit a new fuse.

During the operation, the contact resistance between the fuse and its holders can increase due to oxidization.

It results in increase of the voltage drop in the circuit and heating causing the circuit failure. The defect is detected by the disturbance of the operation of the consumer (reduction of the power) and heating of the fuse. Eliminate the defect by cleaning the holder and fuse from the oxide film.

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Controls and Instrumentation

MTZ series 900

Electric equipment connector components

A standard 8-pin socket is designed for

connecting the current-consuming units of a transport machine or trailed agricultural implement. It is installed on the

cab’s rear support. A plug of the wire

bundle of the hitched machines is connected to the socket.

Socket connection terminal marking: 1 – Turn indicator, left; 2 – Horn; 3 – “Ground”; 4 – Turn indicator, right; 5 – Right clearance light; 6 – Stop light; 7 – Left clearance light; 8 – Hand lamp connection.

Installing the monitor on the tractor An electronic monitor can be installed on

the cab front wall. There are two openings on the front wall between the front and the lower glasses to the left and right from the dashboard.

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Controls and Instrumentation

MTZ series 900

Gearbox single-lever control The 7F/2R synchronized gearbox combined

with synchronized reduction gear allows ob taining 14 forward and 4 reverse gears.

The gears are shifted by means of the lever (1) in accordance with the shifting pattern. Prior to put ting in the gear, select the required range (stage) .

IMPORTANT! The ranges are selected and the gears are shifted by means of a single lever (1), the range (either I or II) being selected first.

The reduction gear lever (2) shall be always in the engaged: either forward (direct trans-

mission “H”) or reverse (retarded trans - mission “L”).

NOTE: The lever of the reduction gear or

multiplier has no fixed neutral position. The lever is allowed to be set to the neutral posi tion when starting the engine in cold season only.

Multiplier lever (2) has two positions:

- “L” - direct gear (OFF) – foremost po - sition;

- “Н” step-up gear (ON).

ATTENTION: using the gear “R” in traction

mode is not allowed.

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Controls and Instrumentation

MTZ series 900

Gearbox two-lever control

The 7F/2R mechanical two-range fixedratio transmission gearbox with two-lever control (gears are shifted and the ranges are selected by means of separate levers).

Jointly with the synchronized accelerator, the gearbox allows obtaining 14 forward and 4 reverse gears.

Selecting the ranges and shifting the gears

The gears are shifted and the ranges are selected by means of separate levers according to the patterns shown in Fig. Select the required speed of the tractor motion according to the information plate on the right side glass of the cab. To put in the gear corresponding to the required speed of the tractor motion, proceed as follows:

1. Step on the clutch pedal and set the required range in the gearbox by moving the range reduction gear lever (2) forward or backward, according to the pattern shown on its handle.

ATTENTION: The stages of the range reduction gear are switched over when the tractor is completely stopped and the clutch pedal is stepped on.

ATTENTION: The gearbox range reduction gear has no neutral position; therefore the 1st or 2nd reduction stage is always engaged in the reduction gear.

2. Step on the clutch pedal and move the change-gear lever (1) to the position of the required gear according to the pattern shown on its handle.

ATTENTION: The first forward gear and the reverse gear are put in after full stop of the tractor with the clutch pedal stepped on.

Putting on the 1st forward gear and reverse gear as well as switching over the stages of the range reduction gear are not synchronized and are performed by movable pinions on the tractor fully stopped. Prior to putting in the said gears or stages

of the range reduction gear release slightly

and step on fully the clutch pedal again. It will ensure the turning-over of the pinions and light putting-in of the gears or ranges.

3. Start the smooth motion of the tractor in the gear selected by releasing the clutch

pedal.

ATTENTION: When operating the tractor, do not hold the foot on the clutch pedal. It will prevent the clutch slip, which causes the overheating and premature failure of the clutch.

ATTENTION: To avoid the increased noise in the gearbox, the design of the gearbox control mechanism is provided with an interlock excluding the simultaneous putting-in of the 4th (direct) gear and the 1st stage of the range reduction gear. Therefore, the 4th gear can be put in with the 2nd stage of the range reduction gear only.

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Shuttle-gear control (if installed)

The shuttle gear is controlled with lever (2) having the following positions:

• ON – rearmost position;

• OFF (forward motion) – foremost position.

ATTENTION! When putting the gearbox

lever to position “R” (reverse motion),

the lever being in rearmost position, the tractor will move forward.

Speed reducer control

(if installed) The change-gear lever of the speed reducer (1) has

five positions:

• “OFF”;

• “ON”;

• “N” – neutral;

• “1” – first gear of the speed reducer;

• “2” – second gear of the speed reducer.

The rod for switching over the speed reducer ranges (2) has three positions:

• I – first range corresponding to reduced

speeds (lower position);

• II – second range corresponding to increased

speeds (upper position);

• N – neutral (mid position).

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Control of engagement of the front driving axle (MTZ 920/920.2/

920.3/952/952.2/952.3)

The control lever (1) has three fixed positions:

• “FDA OFF” – lowermost position. Use it when driving on hard surface roads to prevent the increased wear of the tyres.

• “FDA forcedly ON” – uppermost position. Only use this mode in case of incessant skidding of the rear wheels and when moving backwards, when the engagement of the FDA is required.

• “FDA automatically ON (OFF)” – mid position. In this mode, the FDA is engaged and disengaged automatically by the free running coupling, depending on rear wheel skidding. Use this mode during different field works.

ATTENTION! When using the tractor without cardan shafts, put the control lever (1) to the uppermost position (“FDA forcedly ON”).

Hitch fixation mechanism control (2) (for tractors with power governor)

Lever (2) has two positions:

• “Hitch unlocked” – rightmost position;

• “Hitch locked in upper position” – left-

most. To lock the hitch, lift the implement to uppermost position, having put power governor arm (4) to position «Lifting”, and turn handle (2) to the left. Release down arm (4).

To unlock the hitch, lift the implement and turn lever (2) to the right.

Control of lock of the hydraulic hook (3)

The handle (3) has two positions:

• “Unlocked” – upper position;

• “Locked” – lower position.

To unlock the hydraulic hook, lift it with arm (4) to upper position, pull handle (3) up and fix it. To lock the hook after hitching the trailer to the tractor, lift the hook with arm (4), release handle (3) from fixation and move it to lowermost position.

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Controls and Instrumentation

MTZ series 900

Rear PTO control

Switch of the independent and synchronized drive of the rear PTO

Lever (1) has three positions:

• “PTO independent drive ON” – rightmost position;

• “PTO synchronized drive ON” – leftmost;

• “OFF” – mid position.

To engage the synchronized drive, proceed as follows:

• Start the engine;

• Step on the clutch pedal up to the

stop and put in the 1st or 2nd gear;

• release slowly the clutch pedal and move simultaneously the lever (1) to the leftmost position.

IMPORTANT! Use the synchronous

PTO drive in lower gears in the lowest gears of the 1st and 2nd gearbox ranges at the tractor motion speed not more than 8 km/h. Otherwise power transmission can be damaged.

Switch of the 2-speed independent drive of the PTO (2)

The shifter arm (2) of PTO independent drive has two positions:

• I – 540 rpm – extreme, counter- clockwise;

• II – 1000 rpm – extreme, clockwise.

To set the required PTO speed, release bolt (1), rotate the shifter arm (2) to the I or II position and retighten the bolt (1).

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Controls and Instrumentation

MTZ series 900

PTO control lever The PTO control lever (1) has two posi-

tions:

• PTO OFF – front position of the lev-

er (1);

• PTO ON – back position of the lever

(1).

Control of the rear axle differential lock (1)

To engage shortly the lock press pedal (1).

IMPORTANT! Engage the forced differential lock (1) only shortly to overcome road obstacles and carry out the field and transportation works.

WARNING: Do not use the differential lock at the speeds exceeding 10 km/h and when turning the tractor. Otherwise the tractor control becomes difficult and running gear and power transmission are quickly worn out.

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MTZ series 900

Rear PTO control (for tractors equipped with a hydraulic lift)

To engage the rear PTO, the key switch (4) and push-button switch (5) located on the panel above the right control board are used. The switch (4) has two fixed positions:

• “PTO ON” – when pressing the lower part of the key switch;

• “PTO OFF” – when pressing the upper part of the switch.

To engage the PTO:

• Press the lower part of the key switch;

• Shortly press push-button switch (5).

Control lamp (3) will be on and PTO shank will start rotating.

NOTE: On stopping the engine, the PTO is disengaged automatically.

To disengage the PTO, press the upper part of the switch. The pilot lamp will become dim.

ATTENTION! The PTO engagement operations shall be only performed with the engine running.

Rear axle differential lock control (for tractors equipped with a hydraulic lift)

The differential lock (DL) is controlled with key (1) having three positions:

• “DL OFF” – mid fixed position to be used when performing the transport works on the hard surface roads;

• “DL ON automatically” – by pressing the upper part of the key (1). Fixed position. It is to be used when performing the works with substantial rear wheel skidding.

In the automatic mode, the rear wheels are locked during the straight-line motion and unlocked when turning the guide wheels at the angle exceeding 13 in any direction.

• “DL ON forcedly” – by pressing the lower part of the key (1). Fixed position. It is to be used for locking shortly the rear wheels when overcoming the obstacles. On releasing the lower part of the key, it returns to the mid position. On activating the DL, the pilot lamp (2) lights up, which becomes dim when unlocking the DL in the automatic mode and on setting the key (1) to the mid position.

ATTENTION! Activate the DL under the increased skidding conditions when performing the field and transport works.

IMPORTANT! Disable the DL at the tractor motion speed exceeding 10 km/h. Otherwise, the service lift of the power transmission would be shortened and the tractor control would be impeded. The forced locking shall be used shortly only to overcome road obstacles.

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Hydraulic system pump control The control lever has two positions:

• “Pump ON” – upper position;

• “Pump OFF” – lower position.

IMPORTANT! Switch on the pump only at the minimum rotational speed of the engine idling. Disengage the pump when starting the cold engine and maintenance.

Control of the hydraulic system distributor (external cylinder)

Each of three arms controls the external cylinders and has four positions:

• “Neutral” – lower mid position (fixed);

• «Lifting” – lower non-fixed position.

When releasing the arm, it returns to

“Neutral” (for the distributors Р80-3/4- 111; РП-70 -1221; РП-70-1221С;

RS213 Mita; RS213 MTZ). For the distributors Р80-3/4-222, this position is fixed. The handles are returned automatically to the “N e utral” position at the pressure of 15.5…20 MPa.

• “Forced lowering” – upper mid non-

fixed position between the “Floating”

and “Neutral” ones. On releasing the

arm, it automatically returns to “Neu- tral”;

• “Floating” – upper fixed position.

NOTE: If any distributor arm is put into the “Lifting” or “Lowering” position, the operation of the power governor in the automatic control, lifting and lowering modes is interrupted.

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MTZ series 900

Remote control of the hydraulic system distributor (if installed)

If the tractors are equipped with the RS213 MTZ hydraulic distributors, the remote control of the distributor spool valves is executed by the manipulator (joystick) (1) and arm (2) with the twoway cords. The manipulator and the arm are mounted on the right control board in the tractor cab.

The manipulator (1) makes it possible to control two distributor spool valves (sections) at the same time:

When shifting the manipulator lever lengthwise, the spool valve connected to the left side outlets of the hydraulic system is controlled.

When shifting the manipulator lever crosswise, the spool valve connected to the right side outlets and rear outlets (optional) is controlled.

The arm (2) can be only shifted lengthwise and controls the central spool valve connected to the rear left outlets of the hydraulic system.

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MTZ series 900

Control of the power/position gov ernor of the hydraulic system

The control is performed by means of the lever (1). The control method, either power or position shall be previously set. The lever (1) has the following positions:

• “N” – “Neutral” (fixed position);

• “Lifting” – rearmost position (non-

fixed). Hold the lever with the hand to lift the implement to the required height. After releasing, it returns

back to “Neutral”;

• “Automatic control range” (control

zone) – between the “Neutral” and “Lowering” positions. Beginning the

lowering of the implement corresponds to the control zone onset (minimum cultivation depth). The control zone end corresponds to the maximum cultivation depth;

• “Lowering” – foremost position

(non-fixed). Hold the lever to lower the implement to the required level. After releasing the lever, it returns to control zone end.

NOTE: If any of the distributor levers

is set to the “Lifting” or “Lowering”

position, the power governor operation in automatic control, lifting or lowering modes is interrupted.

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Switch of power and position control methods (1)

To get access to the switch, remove the cover under the seat. The switch has the following positions:

• “N” – OFF;

• “I” – Power control;

• “II” – Position control.

Correction rate governor (2) To reduce the implement position cor-

rection rate, turn the hand wheel (2) clockwise until jerks transferred during correction to the tractor are stopped.

ATTENTION! Prior to setting the lever to the selected position, lift the RMA to the uppermost position

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RMA hydraulic lift control

The hydraulic lift is controlled by means of two levers (1, 2) located on the board in the cab at operator’s right hand.

The power control arm (1) is located close to operator and has the following positions:

Rightmost: maximum tillage depth (digit “9” on the board);

Rearmost: minimum tillage depth (digit “1” on the board);

Full control range of the soil cultivation depth: from “1” to “9”.

Position control lever (2) has the following positions:

Foremost: minimal height of the implement above the soil surface (digit “9” on the board);

Rearmost: transport position (digit “1” on

the board); The maximum height of lifting the im-

plement by the position control lever is provided by the adjustable stop (3).

NOTE: The combined control is provided by limiting the tillage depth with the position control lever in the mode of power control by means of the lever (1).

IMPORTANT! If any of the distributor control handle is set to the “Lift” or “Low-

ering” position, the hydraulic lift control

by means of the levers (1, 2) is automatically ceased.

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Controls and Instrumentation

MTZ series 900

Compressor control The handle (1) has two positions:

• “Compressor ON” – when turning the handle so that the arrow on the arm would be directed backwards with respect to tractor motion;

• “Compressor OFF” – when turning the handle to 180 so that the arrow would be directed forward with respect to tractor motion.

Changing the steering wheel position To change the position of the steering

wheel by height:

• Remove the cover (2);

• Unscrew the clamp (1) by 3…5 turns;

• Move the wheel to the required posi-

tion;

• Tighten the clamp (1) by hand and refit the cover (2).

NOTE: The steering wheel adjustment range by height is 100 mm.

The steering column can be inclined to four different positions from 25 to 40 with the step of 5. To incline the steering column, pull the rod (3).

Page 78

Controls and Instrumentation

MTZ series 900

Cab heater control When switching the heater on, ensure

that the following conditions are met:

1. After filling the cooling system, start the engine and let it work at a medium rotational speed to heat water to the temperature of +50C…+60C, after which open the valve (1), increase the engine rotational speed and after 1-2 min make sure that the cooling fluid circulates through the heat exchanger by opening slightly the drain valve cap (5) on the cab right side. The heat exchanger shall start warming-up. Then the cooling fluid level in the engine cooling system radiator will decrease.

2. Add cooling fluid into the radiator to the required level (50…60 mm below the upper edge of the filler neck).

3. Turn the heater fan on by means of the switch (3) and direct the air flow by means of air distributors (4).

4. The flow of fresh air delivered to the cab can be controlled by opening the recirculation flaps (2).

To drain the cooling fluid from the heating system, the drain plugs (5) are provided on the right and left sides of the cab. After draining the cooling fluid, it is necessary to blow out the system, having closed preliminary the valve on the cylinder block and unscrewed the plugs (5). After blowing-out, tighten the plugs.

NOTE: The valve shall be closed to operate the system in the ventilation mode during warm season.

Page 79

Controls and Instrumentation

MTZ series 900

MTZ Seat

The seat is provided with mechanical suspension consisting of two spiral torsion springs and a gas-filled two-way shock absorber. Shear-type guiding mechanism ensures strictly the vertical displacement of the seat. Dynamic motion of the seat is 100 mm.

The seat has the following controls:

1. Adjustment by operator’s weight within the range from 50 to 120 kg with indication of the suspension travel middle position. Turn the handle (1) clockwise (as seen from

the operator’s seat) to adjust the

seat to larger weight and vice versa.

2. Transverse adjustment within  80 mm from middle position. Lift the lever (2) upwards to the stop and move the seat forward or backward to comfortable position.

3. Back inclination adjustment within the range from 5 to 25. Lift the arm

(3) upwards to the stop, turn the back and release the arm. The back will be fixed in the given position.

The seat can be adjusted by height within 30 mm by moving consequently

it manually upwards to increase the height. To decrease the seat height, lift it abruptly upwards to the stop and then push it down.

Page 80

Controls and Instrumentation

MTZ series 900

Grammer Seat (if installed)

Important! Prior to beginning the op-

eration of the tractor, adjust the seat to the position being the most convenient for you. Perform all the adjustments while sitting on the seat.

The seat is provided with mechanical suspension having the total travel of 100 mm and hydraulic shock absorber protected by a rubber boot. The armrests being adjustable to height and safety belts are standard.

The seat is equipped with the following controls (handles):

1. Back inclination: to 12.5° forward and 5° backward with the step of 2.5°.

2. Weight indicator.

3. Weight control: from 50 to 130 kg steplessly.

4. Forward/backward motions: within the range of 150 mm with the step of 15 mm.

The adjustment of the seat height within 60 mm is provided in three positions. To set the required height, pull the seat upwards. The indicator click determines a new position. Should the seat be pulled upwards from the uppermost position, the lowering mechanism will operate and the seat will be lowered to the lowermost position.

Note: Do not use solvents for cleaning the seat upholstery. Use only warm water with small amount of detergent.

Page 81

Operating Instructions

MTZ series 900

OPERATING INSTRUCTIONS

Tractor pre-operation

When preparing a new tractor for operation, re-activate it: To do this:

• remove protective covers and plugs fitted on the engine;

• install peacocks of the radiator and cyl- inder block;

• fill in all the refill tanks;

• u n pack the silencer put in the cab and fit it

onto the exhaust manifold so that exhaust pipe outlet cut would be directed forward along the tractor motion. Install the retain ing clip at the distance of 8…12 mm from the silencer branch end. Tighten the clip nuts with the torque of 44…54 Nm;

• drain the sediment from the coarse and fine fuel filters and fuel tank;

• fill the fuel supply system with fuel and bleed the system to remove air from it;

• check the fan belt tension;

• check and adjust the air pressure in the

tyres;

• make the service of the storage battery;

• tighten the fasteners;

• grease all the lubrication points using a

gun;

• check and adjust, if necessary, the front wheel toe-in.

WARNING! To avoid injuries, make

sure that all protective guards are in their places prior to starting the diesel engine.

ATTENTION! Starting a new engine, which is not run-in, by towing is not allowed to avoid the intense wear of the engine parts.

Running-in

Your new tractor will work reliably and for long time, provided that running-in is made properly and necessary maintenance is provided within the recommended terms. When executing the 30hour running-in, observe the following rules:

1 . Watch constantly the instrument

readings and operation of lubricating, cooling and feed systems. Monitor he oil and fluid levels in refill tanks.

2 . Check the tightening and retighten the

external fastening junctions.

3 . Run in the tractor on light transport

and field works (harrowing, cultivation, sowing, etc.), gradually increasing the load at different gears.

4 . Do not overload the engine, do not

allow fuming or drop of the rotational speed. The overload symptoms are abrupt drop of the rotational speed, fuming and failure to respond to higher fuel feed.

5 . The operation of the tractor at very low

gear with small load at high rotational speed of the engine will result in ex cessive fuel consumption. The correct gear selection for each particular work provides the fuel saving and reduces the engine wear.

6 . Regularly perform time-shift mainte-

nance in accordance with recommendations stated in this Manual.

7. After running-in the tractor, perform the maintenance works (see Section “Maintenance”) .

Page 82

Operating Instructions

MTZ series 900

Starting the engine

Starting under normal conditions:

Check the level of oil in the crankcase and of cooling fluid in the radiator and the presence of fuel in the tank.

IMPORTANT! Never start the engine with the empty cooling system! IMPORTANT! Start the engine and check the instrument operation while sitting in the

operator’s seat only.

WARNING: Never operate with tractor indoors. IMPORTANT! The MTZ-

900.3/920.3/950/950.3/952/952.2/952.3 tractors are equipped with turbocharged diesel engine. High rotational speeds of the turbocharger require the reliable lubrication when starting the engine. Therefore prior to first starting or after long-term storage, rotate the crankshaft by the starter for 10 s without fuel supply to lubricate the turbocharger bearings. Prior to loading the engine, let it run idle for 2…3 min.

1 . Apply parking brake (1); 2 . Set the change gear lever (2) to neutral

position, move it to the leftmost position and hold it in this position until the start is completed and the step-down reducing gear lever (9) to the extreme position (back or front);

3 . Set the PTO lever (3) to the OFF posi-

tion and the “Synchronous–

Independent” switching lever – to the “Neutral” position;

4 . Set the ground switch (4) to the ON posi tion; 5 . Set the fuel feed arm (5) to the mid-

dle position;

6 . Step on the clutch pedal (6);

7. Turn starter key (7) to the position II (Start) and hold it until the engine is started, but not more than 15 s. Then the start control light in the pilot lamp block unit (8) will light up. When the engine starts running, the light shall become dim. If the engine fails to start, repeat starting after at least 30…40 s.

ATTENTION! If the starter fails to operate and the pilot lamp of the starter control board blinks at low frequency (about 1.5 Hz), this indicates that the change gear lever is not in neutral po-

sition or there is a breakage in the start locking circuit. If the light blinks at high frequency (about 3 Hz), there is a failure in the alternator circuit (terminal “W” or ”~”).

8. Release the clutch pedal (6). After starting the engine, check the operation of all indicating lamps and instrument readings (cooling fluid temperature, oil pressure in the engine and storage battery charge). Let the engine run at 1000 rpm to stabilize the oil pressure in the operating range.

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Operating Instructions

MTZ series 900

Starting at low temperatures

(+4°С and below)

Important! To avoid the damage of the

power gear, do not push or pull the tractor to start the engine by towing.

The engines of the MTZ-

900.3/920.3/950.3/952.3 tractors are

equipped with glow plugs. When energizing them, the plugs get redhot and heat the air taken into each engine cylinder. At steadily low temperatures, use the winter oil grades in the engine crankcase, gear box and hydraulic system in accordance with the recommendations of this Manual. Keep storage batteries always charged. Use pure winter diesel fuel not contaminated with water. To avoid failures, drain sediments from the coarse fuel filter and fuel tanks every day.

Attention! If the tractor is equipped

with electric torch pre-heater, use

previously published “Operating

instructions”.

Procedure of starting the engine at low temperatures:

• Switch off the hydraulic system

oil pump drive to reduce the resistance to the crankshaft turning;

• Check the level of oil in the en-

gine pan and of cooling fluid in the radiator;

• Apply the parking brake to keep the tractor from motion;

• Set the change gear lever and

the range lever (2) to the neutral position, move it to the leftmost posi-

tion and hold it in this position until the start is completed and the stepdown reducing gear lever to the extreme position;

• Set the PTO control lever (3) to the

OFF position and the “Synchronous–

Independent” switching lever – to the “Neutral” position;

• Set the ground switch to the ON posi-

tion;

• Set fuel feed control arm (5) to the

mid position;

• Step on the clutch pedal;

• Hold the key in the “I” position for

more than 2 s. Then the starting aid warning lamp will light up at the pilot lamp block, signalling about the glow plugs energizing. Hold the key in this position. As soon as the warning lamp starts blinking at the frequency of 1 Hz, the glow plugs and the engine are ready for starting;

• Turn the starter key to the “II” posi-

tion and start the engine under normal conditions as stated above. After starting the engine, the pilot lamp will become dim and audible warning will be silenced.

Note: The system ensures the oper-

ation of the glow plug within 3 minutes after starting the engine (then the pilot lamp is off).

Attention! If the glow plug pilot

lamp lights up in the blinking mode at the frequency of 2 Hz after starting the engine and operation within 3 minutes, this indicates that the glow plugs are not switched off after finalization of the full cycle by the system. Shut down the engine, turn the ground switch off and eliminate the failure. A probable reason can consist in sticking the electromagnetic relay contacts.

• Release the clutch pedal. Warm up

the engine.

Page 84

Operating Instructions

MTZ series 900

Starting the tractor motion

ATTENTION! When selecting the re-

quired gear, use the gearbox switching diagram.

To start the movement, proceed as follows:

• step on the clutch pedal fully;

• select the required gearbox range;

• shift the lever (1) to the leftmost po-

sition and set the range II or I, respectively, by moving the lever forward or backward;

• return the lever to the neutral position and then to the right, select the required gear and set the required speed by moving the lever (1) forward or backward;

• set the lever 2 to the required extreme position (forward or backward)*.

Release the parking brake and release smoothly the clutch pedal while increasing slightly the fuel feed. On starting the motion, increase the fuel feed.

Avoid starting the motion with high traction load (e.g. a plough deepened into the soil).

ATTENTION! Always step on the clutch pedal prior to engaging the range (step) and putting in the gear. Do not hold the foot on the clutch pedal during operation on the tractor, since this can lead to clutch slipping, its overheating and failure.

Forward – direct gear, back – reducing the speed for tractors with reducing gear and increasing the speed for tractors with multiplier.

Page 85

Operating Instructions

MTZ series 900

Stopping the tractor

To stop the tractor:

• Reduce the engine crankshaft speed;

• Step on the clutch pedal;

• Set the change gear lever to neutral

position;

• Stop the tractor by applying the service brakes;

• Apply the parking brake.

Steering control

IMPORTANT! The tractors are

equipped with the hydrostatic power steering system. If the engine is stopped, the pump does not supply the system and it begins automatically operating in the manual mode where turning the tractor requires applying more force to be applied to the steering wheel.

IMPORTANT! To stop the tractor in case of emergency, step on the clutch pedal and twinned service brakes pedal at the same time.

Shutting down the engine

IMPORTANT! Prior to shutting down

the engine, lower the implement onto the ground and let the engine operate

at 1000 rpm within 1…2 min. This will

decrease engine temperature.

To shut down the engine, proceed as follows:

• set manual fuel feed arm to minimal feed position (back to the stop);

• disengage the PTO and set all the dis- tributor’s levers to neutral position;

• lower the implement onto the ground;

• pull engine shut-off lever cord handle to

fully stop the engine;

• turn ground switch off to avoid storage battery run-down.

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Operating Instructions

MTZ series 900

Switching over the transmission with a shuttle gear (if installed)

Switch the gearbox and the shuttle gear in accordance with the changeover scheme. Using the tractor in the “shuttle” mode makes it possible to change quickly the di rection of the tractor motion by means of the lever (2) without using the change gear lever (1). The shuttle gear control lever (2) is located under the steering column (unlike the reducing gear lever, it is bent to the left) and has two positions:

• “Reverse OFF” – foremost position;

• “ Reverse ON” – rearmost position.

IMPORTANT! When changing motion di -

rection, step on the clutch pedal and stop the tractor.

NOTE: When the shuttle gear is engaged

and the change gear lever (1) is set to the gear I-R and II-R, the tractor moves for ward.

Page 87

Operating Instructions

MTZ series 900

Operation of the tractor equipped with a speed reducer (optional)

1 . Set the change gear lever (4) to neutral

position and reducing gear lever (1) to foremost or rearmost positions.

2 . Set the speed reducer controls as fol-

lows:

• gear handle (2) to the “ON” position;

• range rod (3) to the “N” position

(neutral).

To start the tractor motion: 1 . Set the minimum idling speed of the

engine.

2 . Step on the clutch pedal. 3 . Set the speed reducer gear handle from

position ON to neutral.

4 . Select the required speed reducer gear. 5 . Set the required speed reducer range.

ATTENTION! It is forbidden to put in the 2

n d

gear of the speed reducer range II at

the 2

n d

gearbox reverse gear.

6 . Put in the required gear of the gearbox

in the range I.

7 . Release smoothly the clutch pedal. If

necessary, increase fuel feed.

8 . Adjust the tractor speed by varying fuel

feed.

Speed reducer gear switching

1 . Set the minimum engine idling speed. 2 . Step on the clutch pedal.

3 . Wait for 3…5 s and then set the change

gear lever to the neutral position.

4 . Put in the required speed reducer

drive.

5 . Put in the 1

s t

gear of the gearbox. 6 . Release smoothly the clutch pedal. 7 . Adjust the speed by the foot-operated

or manual fuel feed control.

Stopping the tractor

1 . Set the minimum engine idling speed 2 . Step on the clutch pedal. 3 . Wait for 3…5 s and then set the change

gear lever to neutral position.

4 . Stop the tractor by applying the service

brakes. Apply the parking brake.

Page 88

Operating Instructions

MTZ series 900

Hydraulic system The hydraulic system for three-point rear attachment control is equipped with power governor*, which ensures system operation in the following modes:

• power control;

• position control;

• height control.

Power and position control The power/position control makes the system sensitive to variation of operating conditions. Effective application of these modes depends on the unitized machines and land conditions.

Position control

It provides the accurate and sensitive moni -

toring of the position of the attached

equipment like spraying machine, leveller

and others above the ground. The position

c o ntrol can be used with the tillage ma-

chines, semi-hookup ploughs with external

cylinders, etc. However, it is not recom-

mended to use this control on uneven fields

when using the tillage machines and im-

p l ements.

Hydraulic lift (if installed)

The HMS with hydraulic lift provides for op -

eration in the following modes:

• lifting the RMA and lowering it under its own weight;

• position control;

• power control;

• combined control (adjusting the cultiva-

tion depth according to the soil condi tion with limiting the maximum depth by the position control).

Th e MTZ tractors with index “.2” are

equipped with RMA hydraulic lift and do not have power governor

Power control It is the most suitable mode for operation with mounted implements, the working parts of which are deepened into the soil. The system is sensitive to traction effort var iation (caused by the changes in the soil re sistance or soil tillage depth) via central rod of the hitch mechanism. The hydraulic sys tem responds to these changes by lifting or lowering the implement to maintain the giv en tractive force at constant level. The sys tem reacts to the compressing and stretch ing forces in the central rod, i.e. is a dualaction system.

Height control When tilling the soil with greatly varying

density and resistance, and uneven sur face, if the power o r position control does not ensure satisfactory tillage quality ac cording to land treatment requirements, it is recommended to use the height control (using the implements with supporting wheels).

Page 89

Operating Instructions

MTZ series 900

Working equipment to attach agricultural machines to the tractor

(for tractors with power governor) ATTENTION! Prior to attaching the ma-

chines read carefully this section.

Rear three-point mounted attachment:

to join mounted and semi-mounted agricultural machines – ploughs, seeders, cultivators, spraying machines, etc.

Traction hitch mechanism (cross-bar)

ТСУ-1Ж: to work with trailing machines, potato combines and others (except single-axle ones) with the speed of up to 15 km/h.

ATTENTION! Using the ТСУ-1Ж when performing the transportation works is strictly forbidden.

Traction hitch mechanism ТСУ-2 (hy draulic hook): to operate single-axle

trailers and other machines.

Traction hitch mechanism ТСУ-1М (floating lever): to operate with heavy trail-

ing machines (optional). A combined variant with a hook for working with the semitrailers.

Traction hitch mechanism ТСУ-ЗК (trail - er gear with automatic hitch): to operate

two-axle trailers.

Page 90

Operating Instructions

MTZ series 900

Rear mounted attachment (HMS with power governor)

The second-category three-point mounted attachment ensures the connection of mounted and semi-mounted agricultural machines and implements to the tractor with the following attachment components:

• hanger axle length “L” (distance be-

tween joints “A” and “B”) is equal to

870 mm;

• machine support height is 460 mm; 510 mm;

• pin diameter to connect to lower rod joints (1) is 28.7 mm;

• pin diameter to connect to upper rod (2) is 25 mm.

The lower rods consist of two parts:

• front part or rod itself;

• rear end with the ball joints. Standard

length of the low rod: 885 mm. To increase the hanger length, install the

rod ends with deflected front joints (Ф704605050-01/055-01).

To increase the load-carrying capacity of the mounted unit, replace the rear rod ends (400 mm long) by the rod ends having the distance of 320 mm between the joint axis and the front aperture (Н50-

4605040А2/045А2). Total lower rod

length will become 805 mm.

ATTENTION! When the rod length is 805 mm, the carrying capacity of the mounted unit will be increased by 10% with decreasing the lifting height by 10%. The same load-carrying capacity can be ensured by installing the angle brace (1) at the additional points (the lifting height will be also decreased by 10%).

Page 91

Operating Instructions

MTZ series 900

To increase the clearance when cultivat ing the high-stem crops, install the front en ds of the lower rods onto the additional hanger axles located at the distance of 110 mm above the lower rod axis. To imitate field profile crosswise when operating wide-cut implements, connect the angle braces (1) with lower rods (2) via longitudinal grooves.

IMPORTANT! To avoid the damage of

the angle brace, the angle brace fork grooves shall be behind the aperture.

Upper rod and angle braces

The upper rod length is adjusted within 500…740 mm. The length of the right ad justable angle brace can be adjusted within 425…520 mm by rotating the h a n dle (1). When being shipped from the fa ctory, the right angle brace length is set to the standard value of 475 mm. When the tractor is shipped from the factory, the left (non adjustable) angle brace length is set to standard 475 mm.

During operation, the left angle brace

length can be changed within 395…510

mm, depending on the standard equip ment of the tractor and type of unitized machines and implements.

IMPORTANT! Make adjustment of the

implement laterally with the right angle brace only.

Depending on the tillage depth and soil na ture, install upper rod to one of the three

positions:

I – light soils and small tillage depth at

power control;

I I – medium soils and medium tillage

depth at power control;

I I I – heavy soils at large tillage depth, as

well as at position control or without power governor.

For tractors equipped with HMS with hydraulic

lift, the upper rod is installed in one position.

425-520

Page 92

Operating Instructions

MTZ series 900

Reinforced rear mounted attachment

The tractors with power governors may be equipped optionally with a reinforced rear mounted attachment with telescopic lower rods, which are to be installed onto the shaft with the diameter of 35 mm instead of that with the diameter of 32 mm. If necessary, the length of the rods equal to 885 mm may be adjusted stepwise with the step of ± 80 mm, in this case, the carrying capacity of the mounted attachment will be varied. For working with trailed agricultural machines, the double cross-bar (4) for the lower telescopic rods (1) with the pivot (5) is optionally delivered. In this case, its tips (3) are fitted instead of the rear ends of the rods (2). The distance from the end face of the PTO to the pivot (hitching point) in such version will be 470 mm

ATTENTION! It is strictly forbidden to use the double cross-bar when performing the transportation works.

Page 93

Operating Instructions

MTZ series 900

Rear mounted attachment of the tractors equipped with the hydraulic lift

Machines: mounted (ploughs, cultivators, seeders, cutters, etc.), semi-mounted (ploughs, soil-tilling units, seeders, potato combines, etc).

Lower rods

Telescopic, one-piece - optional

Length of lower rods, mm:

telescopic

one-piece*

805,885,985

885

Rod joint width, mm: upper (b1)

lower** (b2)

38 or 45

Nominal diameter of attachment components, mm: upper rod pin** lower rod joints (d2)

22 or 25 2 8

Distance from PTO face to hanger axle

595

Load carrying capacity, kN (kgf):

on hanger axle

on 610 mm overhang

43 (4300) 27 (2700)

______________________________________________ * Optional – rods with quickly connectable attachment * * (Quickly connectable attachment). To be agreed when acquir ing the tractor.

Page 94

Operating Instructions

MTZ series 900

Traction hitch mechanisms (THM) of the tractors equipped with hydraulic lift

ТСУ-1Ж-01 (double cross-bar)

ТСУ-1* (single cross-bar)

Machines: semi-mounted (seeders, potato-planters, potato combines, vegetableharvesting machines, etc.), semi-trailer (mowing machines, balers, haulm gatherers, etc.).

ТСУ-1Ж-01 (double cross-bar)

as a unit with telescopic rods – optional

ТСУ-1 (single cross-bar)

with one-piece or telescopic rods on hanger axle – optional

Telescopic rod front end length

570

Distance between PTO face to attach-

ment pin axle

410,490,595*

Attachment pin size

030 (0 30 )

12(1200) 6,

5* (650)*

Vertical load on THM

kN (kg f)

Machine turning angle relative to the tractor

degree

± 65 (± 80)

Indices are given for ТСУ-1

Page 95

Operating Instructions

MTZ series 900

Г15 Lifting THM of the tractors equipped with hydraulic lift

1.ТСУ-2В (fork)

Machines: semi-trailed (semi-trailers, machines for fertilizing, etc.), trailed (disk harrows, tillers, hoeing ploughs, hitch of harrows, cultivators and seeders, etc.).

Hitch mechanism

Fork with the possibility of the vertical displacement

Distance from the fork to supporting surface for

machines without PTO drive, mm

403.. .858 (91 8*) stepwise via 65 mm

Fork position for machines with PTO drive

Lowermost or

uppermost

Distance from PTO face to attachment pin ax-

le, mm

160 or 110

Attachment pin diameter

Vertical load on THM, kN (kg f)

20 (2000)

Machine turning angle relative to the tractor, degree

±65

* With turning over the fork

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Operating Instructions

MTZ series 900

2. ТСУ-ЗВ (fork)

Machines: trailed (automobile-type two-axle trailers, etc), semi-trailed (same as for ТСУ1Ж-01).

Hitch mechanism

Rotating fork with vertical displacement

Distance from the fork to supporting surface for machines without PTO drive, mm

288.. .808 (962*) stepwise via 65 mm

Fork position for machines with PTO drive

lowermost or uppermost, including overturn

Attachment pin size

040

Distance from PTO face to attachment pin axle, mm

400

Vertical load on THM

kN (kg f)

12 (1200)

Machine turning angle relative to the tractor

degree

± 55 (trailers),

± 85 (agricultural machines)

* With turning over the fork

Page 97

Operating Instructions

MTZ series 900

Г17 3. ТСУ-1М (dragbar)

Machines: heavy trailed with active drive of driven elements.

Hitch mechanism

Fork with variation of position relative to PTO face

Distance from the fork to supporting surface, mm

402 (297*)

Distance from PTO face to attachment pin axle, mm

400 or 500

Attachment pin diameter, mm

Vertical load on THM, kN (kg f)

12 (1200)

Machine turning angle relative to the tractor, degree

±85

Page 98

Operating Instructions

MTZ series 900

Hitching machines to the tractor 1 . When hitching machines to the tractor,

make sure first that there is nobody within hitching zone.

2 . Lower the attached device to the lower

position by using the power governor han dle, drive the tractor back and attach the machine to lower rods. Splint the pins. Stop the engine.

3 . Make the upper rod (1) longer or shorter

and connect the rod ball joint with the machine. Splint the pin.

4 . If necessary, adjust the upper rod to ini-

tial or required length.

5 . If necessary, adjust the machine lateral

tilt by using the right adjustable angle brace (2). Increase the angle brace length, turn arm (3) clockwise and vice versa.

6 . Prior to operation, check that:

• the tractor parts are not in dangerous proximity to machine components;

• the central rod is not in contact with PTO enclosure at the lowest position of the machine;

• the PTO cardan drive is not extremely long, with large joint angles and there are no thrust forces;

• the PTO enclosure is not in contact with that of machine cardan drive.

7 . Slowly lift the machine and check the

clearance of at least 100 mm between the tractor and the machine in lifted position.

8 . Check the lateral swing of lower rods

and, if necessary, adjust them by using tie rods.

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Operating Instructions

MTZ series 900

The machine (implement) is also attached to the tractor by the automatic hitch CA-1 connected to the tractor hookup at three points (two rear joints of longitudinal rods and rear joint of the central rod).

To prevent spontaneous disconnection of the machine from the tractor, fix the automatic hitch latch with a spring cotter pin.

Limiting (telescopic) tie bars (А)

The tie bars are use to limit lateral swinging of hanger lower rods both in transport and working states. This is especially required during the works on the slopes, near the excavation pits, wall, etc.

Rear end of the tie bar is attached to the lower rod and the front one – to the holder in one of four positions, depending on the works:

• Position 1. The tie bars exclude implement swinging in transport state.

• Position 2. The tie bars exclude implement lateral swinging both in transport and working states.

IMPORTANT! Positions 3 and 4 should be used only when installing lower rods onto additional axes of the hanger (upper axes).

• Position 3. The tie bars exclude implement lateral swinging in transport state.

• Position 4 The tie bars exclude implement lateral swinging both in transport and working state.

ATTENTION! The tie bars shall be installed only into the second from bottom apertures for holders (position 2) to avoid tie bar failure.

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Operating Instructions

MTZ series 900

100

Partial locking of telescopic tie bars To ensure the required lateral displace-

ment of the machine, e.g., a plough, adjust the tie bars in the operating condition as follows:

• rotating the screw (2), set the handle

(3) at the middle of flat “B”;

• pull out the cotter (5) from the tie bar;

• attach the machine to the lower rods

(7) and raise it a little to pull off the ground;

• having aligned the apertures of the internal

tube (4) with the groove of external tube (6), insert the cotter (5) in the middle of the groove

IMPORTANT! Install the cotter (5) so that it is in the middle of the groove or at minimal displacement towards the tractor. Otherwise, tie bars can be damaged.

Prior to transportation, lift the machine to the up position and check its lateral swinging, which shall not exceed 20 mm in each direction. If necessary, adjust the swinging by rotating the screw (2).

Full tie bar locking For complete locking of the machines,

e.g. a cultivator or attached unit, adjust tie bars in the working state similar to their partial locking, except for the last operation during which align the aperture of the internal tube (4) with that of external tube (6) and insert the cotter (5).

Ensure full locking in transport state (the machine being lifted) by tightening screw (2) into tube (4) to the maximum.