MTZ 900, 900.3, 920.3, 950, 920 Operating Manual
...
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
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.
© Minsk Tractor Works Republican Unitary Enterprise, 2009
3
Table of Contents
Introduction
6
Adopted Abbreviations and Symbolic Notations
8
International Symbols
9
Safety Precautions
11
Technical Data
15
Controls and Instruments
32
Operating Instructions
81
Unitization
127
Adjustments
155
Maintenance
170
Troubleshooting
219
Tractor Transportation and Towing
227
Tractor Storage
228
Appendix А. Electric Equipment
229
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All rights reserved. This book shall not be reproduced or copied either fully or
partially without written permission of the Minsk Tractor Works Republican
Unitary Enterprise.
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.
5
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.
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.
7
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.
8
Adopted Abbreviations and Symbolic Notations
SB
—
storage battery
DL
—
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
GB
—
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
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
10
— 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
Safety Precautions
MTZ series 900
11
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
л
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
Safety Precautions
MTZ series 900
12
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.
Safety Precautions
MTZ series 900
13
• 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
Safety Precautions
MTZ series 900
14
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.
Specifications
MTZ series 900
15
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)
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.
Specifications
MTZ series 900
16
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)
Specifications
MTZ series 900
17
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).
Specifications
MTZ series 900
18
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
Four-stroke, inline, turbocharged, with intermediate charge
air cooling
Number of cylinders
4
Method of mixing
Direct injection
Compression (calculated)
16
15.1
15.1
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
1800
1800
Max speed, rpm
2380
1980
2050
2070
Min speed, rpm
600
700
800
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
4.0±0.5
Fuel injection pressure,
MPa
21.6…22.4
21.6…22.4
23.5…24.7
23.5…24.7
Specifications
MTZ series 900
19
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
3
/8Г
2
(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)
Specifications
MTZ series 900
20
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
1
I
2.5
3.2 2 7.1
9.4 3 8.4
11.1
1
II
4.2
5.5 2 12.1
16.0
3
14.3
18.9
4
26.6
35.2
rear
1R
5.2
6.8
2R
II
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
1
I
2.5
3.4 2 7.4
9.8 3 8.7
11.6
1
II
4.3
5.7
2
12.6
16.6
3
14.9
19.7
4
27.7
36.6
rear
1R
I
5.4
7.1
2R
II
9.1
12.1
Specifications
MTZ series 900
21
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
1
I
2.8
3.6 2 8.0
10.6 3 9.5
12.5
1
II
4.7
6.2
2
13.6
18.0
3
16.1
21.3
4
29.9
39.6
rear
1R
I
5.8
7.7
2R
II
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
1
I
2.7
3.5 2 7.7
10.2 3 9.1
12.0
1
II
4.5
6.0
2
13.1
17.3
3
15.5
20.5
4
28.8
38.1
rear
1R
I
5.6
7.4
2R
II
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
1
I
2.0
2.7 2 5.8
7.7 3 6.9
9.1
1
II
3.4
4.5 2 9.9
13.1
3
11.7
15.5
4
21.8
28.8
rear
1R
I
4.2
5.6
2R
II
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
1
I
2.1
2.8 2 6.0
8.0 3 7.1
9.4533
1
II
3.5
4.7
2
10.3
13.6
3
12.2
16.1
4
22.6
29.9
rear
1R
I
4.4
5.8
2R
II
7.5
9.9
Specifications
MTZ series 900
22
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
1
I
2.8
II
4.7
2
I
8.0
II
13.6
3
I
9.5
II
16.1
4 29.9
rear
1
I
2.6
II
4.4
2
I
7.5
II
12.7
3
I
8.8
II
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
1
I
3.4
II
5.7
2
I
9.8
II
16.6
3
I
11.6
II
19.7
4 36.6
rear
1
I
3.1
II
5.4
2
I
9.1
II
15.6
3
I
10.8
II
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
1
I
2.7
II
4.5
2
I
7.7
II
13.1
3
I
9.1
II
15.5
4 28.8
rear
1
I
2.5
II
4.2
2
I
7.2
II
12.2
3
I
8.5
II
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
1
I
3.2428
II
5.5215
2
I
9.3909
II
15.9898
3
I
11.1207
II
18.9353
4
35.2157
rear
1
I
3.0266
II
5.1534
2
I
8.7648
II
14.9238
3
I
10.3794
II
17.6730
Specifications
MTZ series 900
23
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
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
1
I
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
2
5.8
7.7 3 6.9
9.1
1
II
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
2
9.9
13.1
3
11.7
15.5
4
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
2R
II
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
Specifications
MTZ series 900
24
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
1
I
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
2
7.1
9.34
3
8.4
11.1
1
II
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
2
12.1
16.0
3
14.3
19.0
4
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
2R
II
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
Specifications
MTZ series 900
25
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
1
I
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
2
6.0
8.0 3 7.1
9.5
1
II
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
2
10.3
13.6
3
12.2
16.1
4
22.6
30.0
1R
I
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
2R
II
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
Specifications
MTZ series 900
26
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
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
1
I
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
2
7.4
9.8
3
8.7
11.6
1
II
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
2
12.6
16.6
3
14.9
19.7
4
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
2R
II
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
Specifications
MTZ series 900
27
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
II
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
II
13.6
3 I 9.5
II
16.11
4 30.0
rear
1 I 2.6
0.6
1.8
2.5
7.6
II
4.4
1.0
3.0
4.3
12.9
2 I 7.5
II
12.7
3 I 8.8 II
15.0
4
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
II
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
II
5.7
1.3
4.0
5.6
16.9
2 I 9.8
II
16.6
3 I 11.6
II
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
II
15.5
3 I 10.8
II
18.4
4
Specifications
MTZ series 900
28
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
II
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
II
4.5
1.1
3.1
4.4
13.3
2 I 7.7
II
13.1
3 I 9.1
II
15.5
4 28.8
rear
1 I 2.5
0.6
1.75
2.4
7.3
II
4.2
1.0
2.9
4.1
12.4
2 I 7.2
II
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
I
Mechanical speed-
reducing unit range
II
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
II
5.5
1.3
3.8
5.4
16.2 2 I
9.4
II
16.0 3 I
11.1
II
19.0
4 35.2
rear
1 I 3.0
0.7
2.1
3.0
9.0
II
5.2
1.2
3.61
5.0
15.2
2 I 8.8
II
15.0
3 I 10.4 II
17.7 4
Specifications
MTZ series 900
29
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).
Specifications
MTZ series 900
30
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
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