TYM T303HST, T353HST Workshop Manual

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TYM

WORKSHOP MANUAL

FOR

TRACTORS

(T303HST/T353HST)

#604-9, Namsan-dong, Changwon-city, Kyungnam, Korea ■■■■TEL:82-55-279-4379, FAX:82-55-279-4447■■■■www.tym.co.kr

HST TRACTOR

T303HST/T353HST

WORKSHOP MANUAL

Chapter 1. Introduction -----------------------------------Chapter 2. Disassembly and reassembly of major point -----Chapter 3. Engine accessories -----------------------------------Chapter 4. HST system --------------------------------------------Chapter 5. Transmission -----------------------------------

Chapter 6. Front axle (4WD) ---------------------------------

01 02 03 04 05 06

Chapter 7. Rear axle and Brakes --------------------------------Chapter 8. Power steering system--------------------------------Chapter 9. Hydraulic system -------------------------------------Chapter 10. Electric accessories and instruments ---------Chapter 11. Service standard and other information -----

07 08 09 10 11

Chapter 1

Introduction

INTRODUCTION-------------------------------------------------------------SAFETY INTRODUCTION------------------------------------------------WARNING SIGNS IN THIS MANUAL---------------------------------SAFETY SIGNS---------------------------------------------------------------SAFETY DECALS----------------------------------------------------------UNIVERSAL SYMBOLS--------------------------------------------------SECTION 1. TRACTOR TYPES AND PUNCHED

IDENTIFICATION MARKS ----------------------------SECTION 2. SPECIFICATIONS-----------------------------------------SECTION 3. GEAR TRAIN DIAGRAMS-------------------------------

1-1 1-2 1-5

1-6 1-11 1-14

1-15 1-17 1-20

SECTION 4. PRECAUTIONS FOR TRACTOR OPERATIONS---

1. INSTRUMENTS -------------------------------------------------------

2. CONTROLS -----------------------------------------------------------

3. FILLING DIAGRAM AND CAPACITY TABLE---------------

4. MAINTENANCE CHART -------------------------------------------

1-21 1-21 1-23 1-24 1-25

Chapter 1 .Introduction

This tractor Workshop manual is for qualified service personnel engaged in servicing and overhauling T303HST/T353HST tractor.Use of this publication is not recommended for field operators since they usually do not have access to special tools and shop equipment essential for most servicing.

Servicing procedures outlined herein contain sufficient information to return all component parts of a tractor to new condition. In discussion of each component parts,it is assumed that a complete overhaul is been performed,consequently,

complete disassembly and reassembly are outlined.The mechanic is relied upon to decide how far disassembly must be carried when complete overhaul is not required.

Study unfamiliar service procedures thoroughly and clearly understood before attempting disassembly. Specific data essential for proper overhaul,such as running clearances and torque values,have been provided in interline of Inspection and reassembly procedures of each group section.

This manual was compiled from latest information available at time of publication. Manufacturer reserves the right to make changes at any time without notice.

Whenever the terms "left"and "right" are used, They means as viewed by the operator when seated in the operator's seat.

1-1

SAFETY INSTRUCTION

ALWAYS PRACTICE SAFETY BY THINKING BEFORE ACTION AVOID FIRE HAZARDS.

-Keep fire extinguishers easily available and in good operating condition. All relevant personnel should know how to operate fire fighting equipment.

-Keep a first aid kit in an easily accessible location.

-Do not smoke while handling fuel,or other highly flammable material.

-Do not use an open pail for transporting fuel.

-Use of an approved fuel container.

-Dispose of all fuel-soaked rags in covered containers where cigarettes cannot be dropped

carelessly.

-Do not smoke and avoid open flame when charging,jumping,or boosting batteries.

-Batteries give off gas which is flammable and explosive.

-Do not charge batteries in a closed area. Provide proper ventilation to avoid explosion of

accumulated gases.

Avoid acid burns.

-Wear safety goggles when handling battery electrolyte.It contains sulfuric acid which is a poison

and can cause blindness.Avoid it contacting eyes,skin,or clothing. sulfuric acid will eat through

clothing and can cause severe burns to skin.

AVOID HIGH-PRESSURE FLUIDS

1) Before beginning work on hydraulic system components,turn off engine and operate hydraulic

control levers to relieve internal hydraulic pressure.

2) Oil under pressure can penetrate skin and lead to personal injury.Treat sources of oil pressure

with extreme care,wearing safety goggles.

3) If hydraulic leak develops,correct immediately.Escaping hydraulic oil can have extremely high

pressure. A stream of high pressure oil may easily penetrate skin just like modern needless vaccination equipment,but with the exception that hydraulic fluid may cause blood poisoning. It is imperative that connections are tight and that all lines and pipes should be in good condition. If injured by escaping hydraulic fluid,see a doctor at once.

1-2

STAY CLEAR OF PTO

1) Entanglement in rotating drive line can cause serious injury or death.

2) Keep tractor master shield and drive line shield in place at all times except for special applications

as directed in the implement operator's manual.

3) Wear fairly tight tight fitting clothing.Stop the engine and be sure PTO driveline is stopped before

making adjustment,connections,or cleaning out PTO drive equipment.

SERVICE TIRES SAFELY

-Tire changing can be dangerous and should be done by trained personnel using proper tools and

equipment.

-Do not re-inflate a tire that has been run flat or seriously under-inflated.Have it checked by qualified

personnel.

-Use wheel handling equipment adequate for weight involved when removing and installing wheels.

1-3

WARNING SIGNS IN THIS MANUAL

The following warning symbols in this manual draw additional attention to items of importance for the safe and correct operation of the tractor.

SIGN MEANING OF SIGN

DANGER

Serious hazard with a very high level of risk of either serious injury or death

WARNING

Hazard or unsafe practice that can lead to severe injury or death.

Hazard or unsafe practice that can lead in injury or death.

1-5

CAUTION

IMPORTANT

Instructions for the correct operation of the machine which, if followed, will ensure that it performs at it’s best

SAFETY SIGNS

SIGNAL WORDS.

A signal word―DANGER, WARNING OR CAUTION―is used with safety alert symbol. DANGER identifies the most serious hazards. Safety signs with signal Word ―DANGER OR WARNING―are typically near specific hazards. General precautions are listed on CAUTION safety signs.

DANGER

WARNING

CAUTION

READ SAFETY INSTRUCTION

Carefully read all safety instructions given in this manual for your safety. Tempering with any of the safety devices can cause serious injuries or death. Keep all safety signs in good condition. Replace

RECOGNIZE SAFETY INFORMATION This symbol, Safety-Alert Symbol, means ATTENTION! YOUR SAFETY IS INVOLVED. The message that follows the symbol contains important information about safety. Carefully read the message

missing

damaged

safety

signs

Keep your tractor in proper condition and do not allow any unauthorized modifications to be carried out on the Tractor, which may impair the function/safety and affect Tractor life.

PROTECTION CHILDREN Keep children and others away from the Tractor while operating. BEFORE YOU REVERSE

- Look behind Tractor for children.

- Do not let children to ride on Tractor or any implement.

1-6

HANDLE FUEL SAFELY-AVOID FIRES

Handle fuel with care; it is highly flammable. Do not refuel the Tractor while smoking or near open flame or sparks.

Always stop engine before refueling Tractors. Always keep your tractor clean of accumulated grease, and debris. Always clean up spilled fuel.

STAY CLEAR OF ROTATING SHAFTS

Entanglement in rotating shaft can cause serious injury or death. Keep PTO shield in place at all times. Wear close fitting clothing. Stop the engine and be sure PTO drive is

stopped before making adjustments, connections, or cleaning out PTO driven equipment.

ALWAYS USE SAFETY LIGHTS AND DEVICES

Use of hazard warning lights and turn signals are recommended when towing equipment on public roads unless prohibited by state or

local regulations.

Use slow moving vehicle (SMV) sign when driving on public road during both day & night time, unless prohibited by law

PRACTICE SAFE MAINTENANCE

Understand service procedure before doing work. Keep the surrounding area of the Tractor clean and dry. Do not attempt to service Tractor when it is in motion. Keep body and clothing away from rotating shafts. Always lower equipment to the ground. Stop the engine. Remove the key. Allow Tractor to cool before any work repair is

caused on it. Securely support any Tractor elements that must be raised for service

work. Keep all parts in good condition and properly installed. Replace worn or broken parts. Replace damage/missing decals. Remove any buildup of grease or oil from the Tractor. Disconnect battery ground cable(−) before making adjustments on

electrical systems or welding on Tractor

1-7

Safety Starter Switch is to be replaced after every 2000 hours/4 years, whichever is

earlier

TRACTOR RUNAWAY

1.The tractor can start even if the transmission is engaged position causing Tractor to runaway and serious injury to the people standing nearby the tractor.

For additional safety keep the pull to stop knob (fuel shut off control) in fully pulled out position. Transmission in neutral position, Foot brake engaged and PTO lever in disengaged position while attending to Safety Starter Switch or any other work on Tractor.

SAFETY STARTER SWITCH

1. Clutch operated safety switch is provided on all Tractors which allow the starting system to

become operational only when the Clutch pedal is fully pressed.

2. Do not By-pass this safety starter switch or work on it. Only Authorized Dealers are

recommended to work on safety starter switch.

3. On some models Safety Starter switch is provided on transmission High-low shifter lever and

in PTO shifter lever.The tractor can be started only if High-low shifter lever is in neutral position.

earlier

1-8

USE OF ROPS AND SEAT BELT

The Roll Over Protective Structure(ROPS) has been certified to industry and/or government standards. Any damage or alternation to the ROPS, mounting hard-ware, or seat belt voids the certification and will reduce or eliminate protection for the operator in the event of a roll-over. The ROPS, mounting hardware, and seat belt should be checked after the first 100 hours of Tractor and every 500 hours thereafter for any evidence of damage, wear or cracks. In the event of damage or alteration, the ROPS must be replaced prior to further operation of the Tractor.

The seat belt must be worn during machine operation when the machine is equipped with a certified ROPS.

Failure to do so will reduce or eliminate protection for the operator in the event of a roll over.

PRECAUTION TO AVOID TIPPING

Do not drive where the Tractor could slip or tip. Stay alert for holes and rocks in the terrain, and other hidden hazards. Slow down before you make a sharp turn. Driving forward out of a ditch or mired condition could cause

Tractor to tip over backward. Back out of these situations if possible

PARK TRACTOR SAFELY

Before working on the Tractor ;

Lower all equipment to the ground. Stop the engine and remove the key

KEEP RIDERS OFF TRACTOR

Do not allow riders on the Tractor. Riders on Tractor are subject to injury such as being stuck by foreign

objects and being thrown off of the Tractor

1-9

AVOID HIGH-PRESSURE FLUIDS

Escaping fluid under pressure can penetrate the skin causing serious injury. Keep hands and body away from pinholes and nozzles, which eject fluids under high pressure. If ANY fluid is injected into the skin. Consult your doctor immediately.

PREVENT BATTERY EXPLOSIONS

Keep sparks, lighted matches, and open flame away from the top of battery. Battery gas can explode.

Never check battery charge by placing a metal object across the poles.

PREVENT ACID BURNS

Sulfuric acid in battery electrolyte is poisonous. It is strong enough to burn skin, cause holes in clothing and cause blindness if found entry into eyes.

For adequate safety always;

1. Fill batteries in a well-ventilated area.

2. Wear eye protection and acid proof hand gloves

3.Avoid breathing direct fumes when electrolyte is added.

4. Do not add water to electrolyte as it may splash off causing severe burns.

you

spill

acidonyourself

;

1.Flush your skin with water.

2.Flush your eyes with water for 10-15 minutes. Get medical attention immediately.

SERVICE TRACTOR SAFELY

Do not wear a necktie, scarf or loose clothing when you work near moving parts. If these items were to get caught, severe injury could result.

Remove rings and other jeweler to prevent electrical shorts and entanglement in moving parts.

WORK IN VENTILATED AREA

Do not start the Tractor in an enclosed building unless the doors & windows are open for proper ventilation, as tractor fumes can cause sickness or death. If it is necessary to run an engine in an enclosed area remove the exhaust fumes by connecting exhaust pipe extension.

1-10

SAFETY DECALS

The following safety decals ARE INSTALLED ON THE MACHINE. If a decal become damaged,illegible or is on the machine,replace it.The decal part number is listed in

the parts lists.

●

●●

● Before starting and operating know the

operating and safety instructions in the operators Manual and on the tractor.

● Clear the area of bystanders.

● Locate and know operation of controls.

● Start engine only from Operator’s seat

with depressed clutch pedal, transmission in the neutral, PTO disengaged and hydraulic control in lower position

● Do not permit anyone but the operator to ride on the tractor. There is no safe place for rider.

● Lock brakes together, use warning lights

and SMV emblem while driving on roads.

● Lower equipment, place gear shift levers in neutral, stop engine, remove the key and apply parking brake before leaving the tractor seat.

● Air pressures are specified by the

manufacturer.

WARNING

● Slow down on turns, rough ground and slopes to avoid upset.

FAILURE TO FOLLOW ANY OF THE INSTRUCTIONS ABOVE CAN CAUSE SERIOUS INJURY TO THE OPERATOR.

Location: On FENDER LH Part No.: 1260-904-070-1A

TO AVOID POSSIBLE PERSONAL INJURY, THIS GUARD MUST BE KEPT IN PLACE

Location: ON PTO guard Part No.: 1260-904-069-0A

1-11

WARNING

Location: On Dash cover side RH Part No.: 1260-904-064-0

CAUTION

TO PROTECT ENGINE AND HYDRAULIC COMPONENTS.

● Idle Engine for 1 minute before shut down or full load operation.

● Do not exceed 1/2 throttle for first 5 minutes of operation

Location: On Radiator bracket side LH & RH Part No.: 1260-904-061-0

Location: On Radiator bracket side LH&RH Part No.:1260-904-063-0

WARNING

KEEP HANDS AND CLOTHING AWAY FROM ROTATING FAN AND

BELTS TO PREVENT SERIOUS INJURY

CAUTION

BEFORE OPERATE THE TRACTOR,READ THE OPERATOR’S MANUAL THOROUGHLY,TO UNDERSTAND THE IMPORTANT FUNCTIONS AND CONTROLS.

WARNING

The cooling system operates under pressure.

●

●●

● It is dangerous to remove the radiator cap

while the system is hot.

●

●●

● Always turn the cap slowly to the first

stop and allow pressure to escape before removing the cap completely.

●

●●

● When operating below 32°°°°F, use suitable

anti- freeze solution as coolant

WARNING

Location: On dash cover side LH Part No.:1260-904-067-0A

1-12

Location: On battery bracket RH Part No.: 1260-904-066-0

Location: On rear frame Part No.: 1260-904-065-0A

DANGER

BLINDNESS CAN RESULT FROM BATTERY EXPLOSION.

KEEP SPARKS OR OPEN FRAMES AWAY FROM BATTERY.

DO NOT JUMP START. BURNS CAN RESULT FROM

BATTERY ACID. IN CASE OF CONTACT FLUSH

IMMEDIATELY WITH WATER

●

●●

● Pull only from drawbar. Pulling from any

other point can cause rear overturn.

●

●●

● Do not operate with unshielded PTO.

●

●●

● Disengage PTO and stop engine before

servicing tractor or attaching and detaching implements.

●

●●

● When towing equipment use a Safety chain

FAILURE TO FOLLOW ANY OF THE INSTRUCTIONS ABOVE CAN CAUSE SERIOUS INJURY TO THE OPERATOR OR

OTHER PERSONS.

WARNING

● Start engine only from operators seat. If safety start switch is bypassed engine can start with transmission in gear.

● Do not connect or short across terminal on starter solenoid.

Attach booster cables as shown on battery decal and operator’s manual.

Starting in gear causing runaway can result in serious injury.

Location: On dash over side LH Part no: 1260- 904-062-0A

SAFETY SIGNS

1-13

UNIVERSAL SYMBOLS

Some of the universal symbols have been shown below with an indication of their meaning

Engine speed rev/minX100)

Pressuredopen slowly

Corrosive substance

Hours, recorded

Continuous

variable

”Tortoise”

Slow or

minimum Setting

Engine coolant temperature

Warning

”Hare” fast or

maximum setting

Fuel level

Hazard

warning

Transmission

oil pressure

Engine

1-14

Stop

control

Neutral

Turn signal

Lights Fan

Transmission

oil temperature

Horn

Power take

off engaged parking brake

Engine oil

pressure

Power take off

Disengaged

Work lamps

Air filter Lift arm/raise Differential

lock

Battery charge Lift arm/lower

See operator’s

manual

SECTION 1. TRACTOR TYPES AND PUNCHED IDENTIFICATION MARKS

The tractor serial number is shown on the left hand side of the tractor as shown in the picture. The engine number is stamped on the top of the engine block.

Engine type and number on the R.H.S of Engine body

Manufacturer’s tractor Sr. No.

1-15

stamped on plate on the L.H.S of Axle bracket

1.MODEL NAME PLATE

The plate indicates the model and type of the tractor.

① Model name ② Production I.D No.

The production I.D reference number is as shown below

353NH B 01 00001

Production serial No Production month Production year Production Model

3.Engine model Identification and serial number Location.

1-16

SECTION 2. SPECIFICATIONS

MODEL T303HST/T353HST

Engine

Maker MITSUBISH Model S4L / S4L2

Type Water cooled 4 cycle 4 cylinder diesel

Out put (Kw/rpm)

T303HST - 21.9 / 2700rpm T353HST - 26.5 / 2700rpm

Number of Cylinder 4 Displacement (cm3)

1500cm3/ 1,758 cm

Bore and Stroke

T303HST - 78 mm X 78.5mm

T353HST - 78 mm X 92mm

Compression ratio

T303SHT - 21.3±±±±0.5

T353HST - 24.3±±±±0.5

Firing order 1-3-4-2 Injection pump Direct Lubrication type Forced circulation

Cooling system Water cooled, Forced circulation

Coolant capacity

7ℓ(1.85 US gal)

1-17

Coolant capacity

7ℓ(1.85 US gal)

Air cleaner Dry Single Element Muffler Horizontal Fuel Diesel fuel

Fuel Tank capacity 33ℓ(8.7 US gal)

Electrical Battery 12V80AH

Starting system Starter motor with pre-heater Starter Capacity 2.0KW

Drive Train

Alternator 12V 50A

Transmission

Hydraulic, + Mechanical

3 range gear with constant-mesh

MFWD(4WD) Standard Differential lock Bevel gears with diff-Lock Brakes Wet disc brake, mechanical Steering hydraulic

MODEL T303HST/T353HST

Clutch

Main Dry single disc, mechanic

PTO Multiple wet disk

Dimensions Overall length(mm) 3337 (131.4”)

Overall width (mm) 1635 (64.37”)

Overall Height (mm) 2400 (94.49”)

Wheel base (mm)

(Distance between shafts)

1100 (43.31”)

Min. Ground Clearance (mm) 323 (12.72”)

Front 7-16, 4PR

Rear 11.2-24, 8PR

Front 8-16, 4PR

Rear 12.4-24, 6PR

Front 27X10, 50-15, 8PR

Rear 12.5-20 R4, 12PR

Front 27X10, 50LL-15, 6PR

Rear 41X14, 00-20- RL

1-18

Axle type

Front

Center pin

Rear Central axle

Implement Operation Hydraulic

Mounting method 3-Point hitch Drawing method Trailer hitch 3-Point hitch category Category 1 Hydraulic-control Position, Remote control, Joystick

Traveling speeds:Km/h (Mile/h)

Range shift

Engine rpm @2,700

Forward Reverse

L ~6.2 (~3.85) ~6.2 (~3.85)

M ~11.5 (~7.14) ~11.5(~7.14)

H ~25 (~15.54) ~25(~15.54)

MEMO

1-19

SECTION 3. GEAR TRAIN DIAGRAMS

FIG.1-3 GEAR TRAIN DIAGRAM

1-20

SECTION 4. PRECAUTION FOR TRACTOR OPERATION

1. INSTRUMENTS

Note;

Oil pressure warning light

and charge light on the monitor array will light when the main switch is

turned from OFF to ON

-All lights on the panel go out automatically when the engine is started and its speed is increased to a specific level.

- Do not panic if some lights on the monitor light array do not go out while the engine is at idle speed just after its starting.They will go out automatically when the engine speed reaches as a specific level.

1-21

MEMO

1-22

2.CONTROLS

1-23

Cruise Control Lamp

Oil pressure lamp

PTO monitor Lamp

High beam lamp

Low beam lamp

Glow signal

Lamp

fuel

Charge lamp

Parking brake

lamp

4WD drive lamp

Check lamp

MONITOR LIGHT ARRAY

No. Filling point Fillings Quantity Liter (gal.)

MODEL T303HST/T353HST

1 RADIATOR 50/50 : Ethylene Glycol/Water (L.L.C)

ASTM D4985 / D6210

7ℓ(1.85 US gal)

2 ENGINE API : CF-4 grades

Above:25°C(77°F)… SAE30 or 15W/40

0°C to 25

C(32

F to 77

F)…

5 ℓ (1.32 US gal)

3. FILLING DIAGRAM & CAPACITY TABLE

TABLE 1-7

Tire size and inflation

TABLE 1-8

1-24

0°C to 25

C(32

F to 77

F)…

SAE20 or 10W30 Below 0°C(32°F)… SAE 10W or 10W-30

5 ℓ (1.32 US gal)

3 TRANSMISSION CASE See next page *

35ℓ(9.25 US gal)

4 FRONT AXLE Gear oil #80 or #90 (API GL-4 grade)

8.2ℓ(2.166US gal)

5 FINAL DRIVE CASE(B) Gear oil #80 or #90 (API GL-4 grade) 6 Clutch pedal shaft Grease

As required

7 BALL JOINT Grease

As required

8 FUEL TANK Diesel fuel 33ℓ(8.717 US gal)

Tire DIVISION SIZE Air pressure Mpa (PSI) MODEL

R1 (Ag)

Front

7-16, 4PR 0.176 Mpa (25.53 PSI)

T303HST T353HST

Rear

11.2-24, 8PR 0.235 Mpa (34.08 PSI)

R1 (Ag)

Front 8-16, 4PR 0.176 Mpa (25.53 PSI)

Rear 12.4-24, 6PR 0.176 Mpa (25.53 PSI)

R4 (Ind)

Front 27X10, 50-15, 8PR 0.380 Mpa (55.11 PSI)

Rear

12.5-20 R4, 12PR 0.340 Mpa (49.31 PSI)

R3 (Turf)

Front

27X10, 50LL-15, 6PR 0.220 Mpa (31.91 PSI)

Rear

41X14, 00-20- RL 0.170 Mpa (24.66 PSI)

4. MAINTENANCE CHART

○ inspection,replenish,and adjustment

● Replacement △△△△ Cleaning and/or washing ★ Consult your Dealer

Inspection

items

Daily

Inspection and servicing intervals

Hour of operation

(X10 on hour meter)

Intervals after that

Judgment

criteria mm(in)

5 101520253035404550556

Engine oil

○ ● ● ● ● ● ●

Replace after every 100hours

Level is between upper and lower limits

Oil filter

● ● ●

Air cleaner

△△△△ △△△△ △△△△ △△△△ △△△△ ●

Clean after every 100hrs.Replace element that has been washed more than 5 times

Radiator coolant

○

Replace every year Fill coolant up to

radiator throat

☞ ENGINE

1-25

Radiator

○

Radiator fin & screen

○ △△△△ △△△△ △△△△

Clean cooling fins and cores

Fuel

○

Everyday and before work

Tank should be full

Fuel filter

○ △△△△ ○ △△△△ ○ △△△△ ● ○ ○ △△△△ ○ △△△△ ●

Wash after every 100hrs.and replace after 300 hrs.

Fan belt

○

About 5(0.20in) deflection pushed with a finger

Hose clamps

○

Electrolyte level

○ ○ ○ ○ ○ ○ ○

Check after every 100hrs.and replenish if necessary

Inspection

items

Daily

Inspection and servicing intervals

Hour of operation

(X10 on hour meter)

Intervals after that

Judgeement criteria

mm(in)

5 101520253035404550556

Transmission oil

○ ● ●

Replace after initial 50 hrs,then after every 300 hrs.

Clean hydraulic suction filter at the same time.

Strainer

△△△△ △△△△

HST oil

● ●

Front axle oil

● ○ ○ ○ ○ ○ ○

Check after every 100 hrs.Replace after every 600hrs.

Brake pedal

○

Free play:

1.18~1.57 in

Greasing up each part

○

Replenish after every 50 hrs(every time after pudding)

○ inspection,replenish,and adjustment

● Replacement △△△△ Cleaning and/or washing ★ Consult your Dealer

☞ TRANSMISSION

Steering wheel free play

○

Toe-in

★ ★

Check every 300 hrs

0.08~0.24 in

Front wheel hub greasing

Inject grease after every 900 hrs

Retightening ball joints of

steering system

○

Check after every 300 hrs

Wheel tightening bolts

○

All should be tighten

Greasing each nipple

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

Replenish every 50 hrs (Everyday in dusty condition)

Loose bolts and nuts

○

Electric wiring

○ ○ ○

Check every year

1-26

Inspection

items

Daily

Inspection and servicing intervals

Hour of operation

(X10 on hour meter)

Intervals after that

Judgment criteria

mm(in)

5 101520253035404550556

Electric Parentheses

All should work properly

Adjusting accelerator pedal and throttle lever

★

Check after 300 hours

Oil leaks in clutch housing

Check every year by removing the plug installed in the front bottom of clutch chamber

Hydraulic fluid filter

● ●

Replace after initial 100 hrs.and then after every 300 hrs

4WD front axle housing oil

● ○ ○ ○ ○ ○

Check after every 100 hrs.Replace after every 600hrs

1) Every terminal should be connected securely

2) Wiring should not interfere with other parts.

3) Fatigued wiring should be replaced.

4) Wiring should be held in each clamp properly.

1-27

Rubber pipes

○ ○ ○ ○ ○

Check after every 100 hrs.

Chapter 2

Disassembly and reassembly of major components

2-1 2-1

2-1

2-4

SECTION 1. GENERAL PRECAUTIONS AND SEPARATION

AND REINSTALLATION ---------------------------------

1. Before operation -------------------------------------------------

2. Precautions to be followed when installing standardized parts.

-----------------------------

SECTION 2. OPERATION CHART FOR DISASSEMBLY

AND REASSEMBLY BY MAJOR BLOCKS------------

2-5

2-5 2-6 2-7 2-12 2-16 2-18 2-20 2-21

SECTION 3. SEPARATION OF MAJOR COMPONENTS

--------

1. Separation of the front axle and axle bracket ---------------------------

2. Separation of the engine and front axle bracket --------------------------

3. Separation of the engine and front transmission ---------------------------

4. Separation of the front transmission and mid transmission------------------

5. Separation of the mid transmission and rear trans mission------------------

6. Separation of the rear transmission and rear axle housing ------------------

7. Separation of the rear transmission and MID PTO ---------------------------

8. Separation of the rear transmission and Cylinder case ----------------------

Chapter 2

Disassembly and reassembly of major components

SECTION 1. GENERAL PRECAUTIONS FOR SEPARATION AND REINSTALLATION

1.BEFORE OPERATION

1) Always be safety-conscious in selecting clothes to wear and suitable tools to use.

2) Before disassembly, be sure that you familiarize yourself with the assembled condition for subsequence in reassembly.

3) Keep parts and tools in proper order

during operations.

4) When servicing electrically charged parts,be sure to disconnect the negative

battery terminal.

2. PRECAUTIONS TO BE FOLLOWED WHEN INSTALLING STANDARDIZED PARTS.

(1) Roller or Ball bearings

1) When a bearing is fitted in by the outer race ,use an installer which is an specially

designed to push only the outer race and vice versa.

2) The installer must be designed to install the bearing on the shaft in a parallel position.

3) When installing a bearing which appears the

same on both sides, install it so that the face which has the identification number faces

5) To prevent oil or water leaks,use the liquid gasket as required.

6) When lifting up only the front or rear part of the tractor,be sure to wedge the grounded wheels.

8) When the tractor is jacked up, be sure to support the entire tractor with something like a stand.Lifting it up with a jack only

is dangerously unstable procedure.

9) When replacing parts,use authorized, genuine TYM parts only.TYM assumes no responsibility for accidents,operating problems or damage caused by the use of

imitation parts.

Also,the use of unauthorized parts will result in relatively poor machine performance.

in a direction for easy visual

identification.All the bearings which are to be

installed in the transmission case should be placed so that their identification number faces

outward.

4) If a shaft or hole where a bearing is to be installed has a stopper, the bearing should be pushed in completely until it is seated against the stopper.

5) Installed bearings should turn smoothly.

(2) Oil seals

1) Oil seals installer should be designed so as not to deform the oil seals.

2-1

2) During installation,be careful not to damage the lips,and assure that it is pushed in parallel to the shaft or hole.

3) When oil seals are installed,there should be no turnover of the lips nor dislocation of the springs.

4) When a multi-lip seal is installed, the

grooves between lips should be filed with grease, not adhesive.

(3) O-rings

1) O-rings should be coated with grease before installing.

2) Installed O-rings should have no slack or twist.

3) Installed O-rings should maintain proper air tightness.

(4) Snap rings

1) Snap ring installers should be designed so as not to permanently deform the snap rings.

2) Installed snap rings should be seated

(5) Spring(roll) pins

1) Spring pins should be driven in properly as tightly.

2) Spring pins should be installed so that their seams should face the direction from which the load is applied.

3) The roll pins installed in the transmission or other parts where much force is applied should be retained with the wire.

Fig.2-2

securely in the groove.

3) Be careful not to overload the snap ring to the extent that it is permanently deformed.

4) How to install the snap ring: When installing a snap ring,install it as

shown in the figure with its round edge side turned toward the part to be retained. This round edge is formed when the snap ring is pressed out.

Fig.2-1

(6) Cotter pins

When installed, cotter pins should be bent securely at the ends as shown in the figure

Fig.2-3

(7) Bolts and nuts

1) Special bolts are installed at several locations ,so be sure not to interchange them other bolts.

2) Bolts and nuts should be tightened to their

specified torque wrench.

3) When locking the bolts or nuts with wire or a

lock washer,

2-2

,Be sure to wind the wire paying sufficient

attention to its winding direction and bend the lock washer for secure looking.

4) When locking bolts and nuts with an adhesive,apply the adhesive on the thread

and tighten securely.

5) Apply an adhesive(THREE BOND

TB1104) to parts through which there is any possibility of oil leaks,such as stud bolts and tapped-through parts.

6) Each lock nut must be tightened securely.

7) When tightening bolts and nuts, refer to

the tightening torque table.

(8) After installation, each grease

fitting should be filled with grease.

1) When installing grease fittings of

type B and C,be sure to turn the fitting tips in a direction that will provide easy access for a grease gun.

4) Each contact surface should be coated with an adhesive (THREE BOND TB 1215) and tightened evenly with bolts.

Adhesive coated surfaces should be installed

within 30 minutes after application of the adhesive.

The contact surfaces should be flawless and free from foreign matter,and especially from grease before application of the adhesive.

5) Precautions for applying adhesives.

- The surface or the thread where and adhesive is to

applied should be completely free of chips.

- The surface or the thread where an adhesive is to

be applied should be completely free of oil-ness.

(9) Other precautions

1) Be sure not to damage any finished surfaces or parts.

2) Always refrain from forcing installation.

3) Each lever knob should be installed coated with an adhesive

(SUPER THREE CEMENT TB1702)

2-3

SECTION 2. OPERATION CHART FOR DISASSEMBLY AND

REASSEMBLY BY MAJOR BLOCKS

Axle Bracket

Front Axle

Engine

Front

Transmission

Space

transmission

•Power steering

•Air cleaner

•Radiator

•Oil cooler

•Center pivot

•Final case

•Differential gear

•Muffler

•HST UNIT

•PTO Clutch

•Flow-Divider

•Engine front parts

2-4

Rear

transmission

Cylinder case

Brake case

Rear Axle Housing

•Mid PTO gears

•Valve system

•Control linkage

•Piston and Arm

•Ring gear

•Differential gear

•Rear PTO gear

•Brake

•Diff-Lock (RH)

•Final gear

•Wheel shaft

•

HST control linkage

•Speed range gears

•Drive pinion

SECTION 3. SEPARATION OF MAJOR COMPONENTS

1.SEPARATION OF THE FRONT AXLE AND AXLE BRACKET

Parts which can be inspected during This operation

-Center pivot

-Final case

-Differential gear

(1) Removal

1) Hold the front hitch or the front bracket securely with a crane or stands.

2) Support the front axle with a jack

3) Remove both right-hand and left-hand tie rods.

4) Remove the pivot metal bolts.

5) Remove the front axle assembly forward.

Note: When working on the 4WD version,the drive shaft should be removed ahead of time.

(2) Installation

1) Install the front axle assembly.

2) Install both pivot metals(supports)

FIG.2-5 Drive shaft

FIG.2-4 Front axle

Note: Apply grease to the bushing and fill the oil seal with

grease ahead of time.Install the oil seal carefully not to allow its lips to turn over.

3) install both of the right and left tie rod.

FIG.2-6 Front axle

2-5

2.SEPARATION OF THE ENGINE AND THE FRONT AXLE BRACKET

Parts which can be inspected during This operation

-Air cleaner

-Radiator

-Power steering system

-Oil cooler

-Engine front part.

(1) Removal

1) Hold or support the engine with a crane or stands.

2) Hold or support the front bracket or the axle bracket in a manner that the part other than the engine can be removed if required.

3) Remove the damper and Engine hood

5) Open the front grille.

6) Detach the head light wiring.

7) Remove the other wiring

8) Remove the inlet pipe from the air cleaner.

9) Remove the air cleaner. Note:

Here the air cleaner can be removed as an assembly.

10) Remove the upper hose,lower hose.and

drain hose from the radiator.

Note:

The radiator should be drained of the coolant ahead of time.

11) Remove the fuel filter.

4) Disconnect the positive and negative battery cables.

FIG.2-7 Wiring harness

FIG.2-8 Battery

Fig.2-9 Fuel filter

12) Remove the radiator and oil cooler from the axle bracket

2-6

Fig.2-10 Oil cooler

Fuel filter

13) Remove the battery and battery bracket.

14) Remove the two hoses for the power steering system.

15) Remove the mounting bolts of the right

8) Connect the wiring of the head lights and other harness.

9) Connect the ground strap and the battery cables.

10) Install the engine hood.

Fig.2-11 Oil cooler and HST unit

hand pivot metal(support) ahead of time.

16) At this stage,the power steering unit can be removed by disconnecting both right-hand

and left hand tie-rods and removing the unit mounting bolts.

Note:

When the pipes related to the hydraulic system are removed,their openings should be covered with plastic caps or the like to keep out dust or other foreign matter.

(2) installation

Reassemble in reverse order of removal.

1) Install the axle bracket on the engine.

2) Retighten the right-hand pivot metal

(support) mounting bolts.

3) Connect the piping of the power steering

system.

4) Install the battery bracket and battery.

5) Install the radiator and oil cooler on the front

axle bracket.

6) Connect the upper, lower and drain radiator

hoses.

7) Install the air cleaner assembly and the inlet

pipe of the air cleaner.

2-7

11) Install the side covers.

12) Fill the radiator with coolant.

3.SEPARATION OF THE ENGINE AND THE FRONT TRANSMISSION.

(1) Removal

1) Drain the transmission of the oil ( In the case of the 4WD version),remove the front wheel drive shaft.

FIG.2-12

Parts which can be inspected during this operation.

-Fly wheel

-HST unit

2) Support the engine on the bottom with a jack or stands.

3) Hold the transmission with a garage jack or a

crane so that the transmission side can be moved when needed.

FIG.2-13

FIG.2-14

4) Disconnect the panel instrument set removing bolts(4 nos.)

2-8

Fig.: Stands

5) Disconnect the battery cables.

FIG.2-15

Note:

-Tilt the steering column rearwards.

-Lift up the panel set and disconnect the wiring

couplers.

5) Remove the cover.

FIG.2-16

6) Disconnect the hydraulic hose from the power steering (orbitrol)

Note:

- Disconnect the linear shift control cable

- Disconnect the cable from both the steering lever side and transmission.

7) Remove the mounting bolts and dismounting

the dash panel

FIG.2-18 hardware Disassembly

2-9

FIG.2-17

8) Wedge both sides of the front axle to prevent the engine from tilting.

FIG.2-19 Wedging

8) Disconnect the rubber hose from the suction pipe.

(2) Engine separation from the chassis.

When separating the engine from the chassis, the following steps are required as well as the ones mentioned above.

FIG.2-20 suction pipe.

2-10

1) Lift the engine with the hoist and hold

the front axle bracket with a stands or the like.

2) Disconnect the upper, Lower ,and drain hoses from the radiator.

3) Disconnect the two power steering system hoses.

FIG.2-21 Line up

4) Remove the fuel hose.

5) Disconnect the the inlet pipe.

6) Loosen the right hand pivot metal tightening bolts beforehand.

7) Separate the engine from the front axle bracket.

(3) INSTALLATION

REASSEMBLY IN REVERSE ORDER OF REMOVAL.

1) Install the engine on the front axle bracket.

2) Retightening the right hand pivot metal tightening bolts.

3) Connect hoses.

4) Assemble the engine and the front transmission.

Note:

- Apply small mount of grease to each of the sliding

parts. Be careful not to apply excessive amount of grease as this could cause clutch slipping.

- During operation, be sure to avoid any of the

reassembly operations that may place load upon the input gear.

5) Install the hydraulic system piping.

6) Install the dash panel.

2-11

7) Install the wiring and rods.

8) Install the covers.

9) Connect the panel set wiring and then install the panel.

10) Connect the wiring for the engine.

11) Connect the battery terminals.

12) Install the engine hood and side cover.

13) Remove the clutch housing and engine tightening

bolts and move the engine forward.

4.SEPARATION OF THE FRONT TRANSMISSION AND SPACER TRANSMISSION

1) Removal A:Removal of the whole floor.

1) Remove the side covers(LH and RH).

2) Disconnect the negative battery cable.

3) Detach all the wiring relevant to the removal of the floor.

7) Remove the slow-return check valve knob

FIG.2-23 Slow return check valve

8) Remove the remote control valve lever

Slow return check valve

Parts which can be inspected during This operation

-HST unit

-PTO clutch

FIG.2-22

4) Disconnect the throttle lever cable from the fuel injection pump and accelerator pedal cable from the pedal.

5) Disconnect the clutch rod and brake rods under the floor.

6) Disconnect the steering cylinder at the hydraulic

pump

Remote Control Valve Lever

FIG.2-24 remote control valve lever

9) Remove the diff-lock pedal

Diff-lock pedal

FIG.2-25 Diff-lock pedal

2-12

10) Remove the parking brake.

11) Remove the main shift and transmission range shift levers.The levers can be separated in the

middle.

12) Remove the control rods of the PTO shift and

4WD shift levers from the transmission.

13) Remove the position control levers.

FIG.2-28 Rubber mounting

17) Lift up the floor slightly with a hoist.

18) Disconnect the linear shift control cable, fuel hoses,and gauge coupler between the fuel tank and floor.

19) Disconnect the pipe relevant to the HST tank.

FIG.2-26 Range shift lever

FIG.2-27 position control lever

14) When the tractor is equipped with an optional remote control valve,remove the remote control valve link.

15) Drain the fuel system of fuel.

16) Remove four rubber mounts.

FIG.2-29

2-13

FIG.2-30

20) Lift the floor gradually taking care not to allow the shaft of the slow return check valve and its hole in the floor to interfere with each other.

Slow return check valve

Note:

Lift up the floor gradually making sure that all relevant wiring. Piping, and links are disconnected.

FIG.2-31 Slow return check valve

3) Disconnect the brake rods.

4) When the tractor is equipped with an optional remote control valve ,remove the remote control piping.

FIG.2-34 Brake rod.

Slow return check valve

Brake rod.

FIG.2-35 Optional remote control valve

2-14

FIG.2-32 Brake pedal (Rod comp)

B: Division of the chassis.

1) Drain the transmission of oil

2) Remove the front wheel drive shaft

FIG.2-33 Front wheel drive

5) Remove the suction and delivery pipes.

6) Remove the delivery pipe for the PTO clutch.

7) Remove the 4WD shift metal

FIG.2-36 4WD shift metal

8) Remove the HST unit from the front transmission case.

9) Hold the clutch housing and space transmission case with a crane or jack.

10) Remove the bolts which tighten the front

transmission and spacer transmission cases.

11) Move the rear part of the tractor rearwards

by turning the rear wheels by hand, and then the spacer and rear transmission assembly will be separated from the front transmission.

(7) Install the front wheel drive shaft. (8) Position the floor taking care not to allow

wiring or other parts to be pinched under it

(9) With the floor lifted up a little, install the fuel

hose and fuel gauge coupler on the fuel sub-

tank and connect the linear shift control cable. (10) Fix the floor at the four rubber mounts. (11) Install all levers,knobs, and Rods. (12) Connect the power steering wheels. (13) Connect the accelerator wires. (14) Install wiring (15) Connect the negative battery cable. (16) Install the side covers(RH and LH)

FIG.2-37 PTO Clutch

Note:

When moving the rear part of the tractor. be careful not to allow the garage jack to shift from the spacer transmission case.

Remark

The rear transmission and spacer transmission

cases should be separated and the reverse shift metal(support) removed in order to take care out or provide access to the main shift and transmission range shift gears. For further details,refer to Chapter 5. Transmission.

2.installation

Reassemble in reverse order of disassembly.

(1) Assemble the front and spacer transmission.

Make sure that the turning lock of the PTO clutch is securely seated in the groove in the

spacer transmission case. (2) Install the reverse shift metal(support) (3) Install the PTO clutch delivery piping. (4) Install brake rods. (5) Install the Oil damper Assy. (6) Install the forward arm and Reverse arm comp

(17) Fill the transmission case with oil

T303/T353HST: 35ℓ

FIG.2-39 forward and Reverse arm

2-15

FIG.2-38 Rod assy

5.SEPARATION OF THE SPACER TRANSMISSION AND REAR TRANSMISSION

1) Removal (1) remove side cover(LH and RH) (2) Disconnect the negative battery cable (3) Remove the slow-return check valve knob.

(8) Remove the operator’s seat (9) remove the position control lever (10) Remove the lever guide. (11) When the tractor is equipped with an optional

remote control valve,remove the remote control valve and relevant parts from the bracket.

Parts which can be inspected during This operation

-Drive pinion gear

- Speed range gear (Transmission range shift)

- HST control linkage.

- MID PTO Gears.

Slow

return

check

valve

FIG.2-40 slow return check valve knob

(4) Remove the diff-lock pedal (5) Remove the parking brake (6) Remove the speed range shit and transmission

range shift levers.

The lever can be separated in the middle

(7) Disconnect the PTO change and 4WD change

rods from the transmission.

FIG.2-41 operator’s seat

FIG.2

42 Remote control valve ( optional )

(12) remove the back panel. (13) remove the fuel tank cover (14) Drain the fuel of fuel tank. (15) Remove the fuel tank and tank stay. (16) Remove the floor frame. (17) Drive in a chock between the front axle

housing and axle bracket.

FIG.2-43.Chock

(18) Place a jack under the bottom of the spacer

transmission case to support

(19) Lift up the rear transmission and remove the

right and left rear wheel

2-16

(20) Remove two rubber mounts.

FIG.2-44 Frame rubber mounts.

Rubber mounting bolts

(21) Lift up the rear end of the floor/fender

assembly by about 10 mm,and place wood between the spacer transmission case and floor

panel (22) Drain the transmission of oil (23) Remove the assembly of the remote control

valve and piping. (24) Remove the forward and reverse pedal (25) Remove the oil damper assembly (26) Remove the forward and reverse arm

(27) Remove magnetic cruise. (28) Remove MID PTO stopper assembly

FIG.2-47 magnetic cruise

FIG.2-45 Forward and reverse pedal

FIG.2-46 Oil damper

Forward and reverse pedal

Oil damper

FIG.2-48 MID PTO stopper

(29) Remove the front wheel drive shaft (30) Remove the brake rods. (31) Remove the 4WD shift metal

FIG.2-49 4WD shift metal

2-17

(32) Remove all the spacer-rear transmission

case tightening bolts and nuts except the bottom bolt.

FIG.2-50 space transmission bolt

(33) Install the rear wheels(LH and RH) and the

remained bolts.Then turn the rear wheels by

hand to move the rear transmission case away

from the spacer transmission case.

2) Installation Reassemble in reverse order of disassembly.

6.SEPARATION OF THE REAR TRANSMISSION AND REAR AXLE

HOUSING

1) Removal

As both sides can be disassembled in the same

way,only side with the diff-lock installed will be

explained here. (1) Drain the transmission case of oil (2) Lift up the rear transmission and remove the

rear wheel on the diff-lock side.

Rear wheel

Parts which can be inspected during This operation

- Diff Lock

- Brakes

- Brake cases

- Final gears

- MID PTO gears.

Note:

•The 4WD drive shaft should be installed on the rear transmission ahead of time.

(1) Join the rear and spacer transmission cases.

Note:

During the operation,be careful not to damage needle bearings, the cut –away part in the gear should be turned downward without fail so as to

clear the gear to be positioned underneath.

(2) Install the main change shifter link and each

change metal. (3) install the brake rods and front drive shaft. (4) Install the hydraulic piping. (5) Install the 4WD shift metal (6) Install the MID PTO stopper assembly (7) Install the forward and reverse arm. (8) Install the oil damper assembly (9) Install the forward and reverse pedal. (10) Install two rear rubber mounts. (11) Install exterior parts. (12) Fill the transmission case with oil

T353HST: 35ℓ

(3) Remove the diff-lock pedal

FIG.2-52 Diff-lock pedal

Diff-lock pedal

Brake case

2-18

FIG.2-51 Rear wheel and brake cases.

(4) Remove the brake rods. (5) Remove the 3-point linkage and related parts.

(6) Support the floor panel with a trestle or the

like.

(7) Remove the rubber mount along with the

bracket.

FIG.2-53 3-point linkage

FIG.2-55 Brake

2) Installation Reassemble in reverse order of disassembly. (1)Install the brake (LH and RH) (2) Install the the brake case (3)join the rear axle and rear transmission

Rubber mounting bolts

(8) Remove the rear axle housing tightening bolts. (9) Remove the brake case from the rear

transmission case.

(10) Detach the brake assembly from the rear

transmission case.

FIG.2-54 Frame rubber mounts.

Note:

Make sure that the diff-lock shifter is fitted into the groove in the dif-lock metal (4) Reinstall the other removed parts. (5) Mount the rear wheel. (4) Refill the transmission with oil up to the

specified level

-Level up to fill the oil can be sought from the rear side of rear transmission case(Window)

2-19

7.SEPARATION OF THE REAR TRANSMISSION AND MID PTO GEARS

Inspection and service of the rear transmission should be performed following the instructions in the paragraph : 5 SEPARATION OF THE REAR TRANSMISSION AND SPACER TRANSMISSION

1)Removal (1) Remove the operator’s seat.

(15) Detach the MID PTO case assembly from

the rear transmission.

Parts which can be inspected during This operation

-MID PTO gears.

FIG.2-56 operator’s seat

(2) Remove the position lever (3) Remove the lever guide(RH) (4) When the tractor is equipped with an optional

remote control valve,remove the remote control

lever and related parts from the bracket. (5) Remove the back panel (6) Remove the tank cover (7) Remove the wiring for the rear combination

lamps and trailer socket coupler. (8) Drain the fuel of fuel tank. (9) Remove the fuel tank and tank stay bracket . (10) Detach the delivery pipe from the cylinder case. (12) Remove the slow-return check valve along

with the shaft.

(13) Remove the 3-point lift link and related parts

from the lift arm.

(14) Remove the MID PTO case tightening bolts.

2) Installation Reassemble the reverse order of disassemble. (1) Tighten the MID PTO case on the rear

transmission case to the specified torque.

FIG.2-57 MID PTO case

Tightening torque 2.45~3.43 Kgf.m

(2) After reassembly, make sure that the system

functions properly.

2-20

Inspection and service of the rear transmission should be performed following the instructions in the paragraph : 5 SEPARATION OF THE REAR

TRANSMISSION AND SPACER TRANSMISSION

1)Removal (1) Remove the operator’s seat.

8.SEPARATION OF THE REAR TRANSMISSION AND CYLINDER CASE

Parts which can be inspected during This operation

- Control valve

- Control linkage

- Piston and lift crank linkage

- PTO change gears.

(10) Detach the delivery pipe from the cylinder

case.

(12) Remove the slow-return check valve along

with the shaft.

(13) Remove the 3-point lift link and related

parts from the lift arm. (14) Remove the Cylinder case tightening bolts. (15) Detach the cylinder case assembly from

the rear transmission

FIG.2-58 operator’s seat

2) Installation Reassemble the reverse order of disassemble. (1) Tighten the cylinder case on the rear

transmission case to the specified torque.

FIG.2-59 cylinder case

Tightening torque 5.4~6.87 Kgf.m

(39.8~50.6lb.fts)

(2) After reassembly, make sure that the system

functions properly.

(2) Remove the position lever (3) Remove the lever guide(RH) (4) When the tractor is equipped with an

optional remote control valve,remove the remote control lever and related parts from

the bracket. (5) Remove the back panel (6) Remove the tank cover (7) Remove the wiring for the rear combination

lamps and trailer socket coupler. (8) Drain the fuel of fuel tank. (9) Remove the fuel tank and tank stay bracket .

2-21

Chapter 3

ENGINE ACCESSORIES

SECTION 1. RADIATOR ---------------------------------------------------

1. General description ------------------------------------------------------

2. Radiator --------------------------------------------------------------------------------------------

3. Specifications ------------------------------------------------------------------------------------

4. Removal of the radiator -------------------------------------------------------------------

5. Inspection of each part --------------------------------------------------------------------

6. Radiator reassembly ------------------------------------------------------

7. Daily inspection -----------------------------------------------------------

8. Trouble shooting ----------------------------------------------------------

3-1 3-1 3-2 3-3 3-3 3-3 3-5 3-5 3-6

SECTION 2. AIR CLEANER SYSTEM

----------------------------------

1. General description ------------------------------------------------------

2. Double elementary air-cleaner ----------------------------------------

3. Inspection of each part--------------------------------------------------

4. Cleaning of the air cleaner----------------------------------------------

5. Element installation ------------------------------------------------------

3-7

3-7 3-8 3-9 3-9 3-10

Chapter 3.Engine accessories

SECTION 1. RADIATOR

1.General description

The pressure cooling system includes mainly the radiator,water pump,multi-blade fan, and

the thermostat.During the warm-up period,the thermostat remains closed and coolant is directed through by-pass to the suction side of the water pump.

Coolant then circulates through the cylinder block and water pump only to provide a uniform and fast warm-up period. Once the engine has reached operating temperature,the thermostat opens and coolant is pumped from the bottom of the radiator via the lower hose into the cylinder block. Here it circulates through the block and around the cylinders.

From the cylinder block,coolant is directed through the cylinder head and into the thermostat housing.With the thermostat open,coolant passes

FIG.3-1

through the housing and upper radiator hose into

the top of the radiator where it is circulated to dissipate heat.

FIG.3-2

3-1

2. Radiator

The radiator consists of radiator cores, a tank to Flow coolant,side plates to install the radiator, and a fan guide. Fin-tube type cores are used and the cores and tank is made of anti corrosive aluminum and

aluminum alloy.

FIG.3-3

3-2

3. SPECIFICATIONS

4. REMOVAL OF THE RADIATOR

1) Release the clamp and remove the upper hose.

2) Release the clamp and remove the lower hose.

3) Release the hose clamp and remove the water drain hose.

Note:

- Refer to the paragraph”SEPARATION OF THE

Excessively compressed air may damage the cores, so perform the air delivery carefully,watching the pressure gauge. Water leaks are inspected by watching for rising air bubbles.

Description T303HST/T353HST Radiator core type Flat water tube with corrugate fins Core train number 4 trains Radiator fin pitch 4.2 mm Thermal radiator area

9.3044㎡

㎡㎡

㎡

Pressure valve opening pressure

0.9±0.15Kgf/ ㎠

Coolant capacity 7 ℓ(contains in cylinder block) Test pressure

0.9±0.15 Kgf/㎠

ENGINE AND THE FRONT AXLE BRACKET

in chapter 2 for operation up to this step.

-When removing the radiator,take care not to

damage the radiator cores and oil cooler.

5. INSPECTION OF EACH PART

(1) Inspection for radiator water leaks.

Water leaks are liable to occur at the fitting portion between the upper tank and the core

section or between the lower tank and the core

section. If any water leak should occur there,repair the leak by soldering.Besides making a visual check,a more complete inspection should be accomplished as follows:

a. Leak test with compressed air.

Place the radiator as shown in the figure. Close the openings for water inlet and with something like a rubber plug and apply compressed air (1㎏f/㎠ or 14.2psi) through the drain pipe into the radiator.

b.Leak test with a radiator cap tester

With the inlet and outlet pipes plugged up and the

radiator filled with water,replace radiator cap with a radiator cap tester as shown in the figure. Pump up the pressure in the radiator to the specified value and check to see if there are any leaks in the radiator. When the radiator is water-tight,the pressure indicated on the pressure gauge does not increase,but if there are leaks,the pressure decreases.This tester is also applicable for leak tests for the whole cooling system,not only for the radiator.The test method is the same as mentioned above.

FIG.3-4

3-3

Testing Pressure

1.8Kgf/ /㎠

㎠㎠

㎠

2) Inspection for radiator clogging

To inspect the radiator cores to see if they are clogged with fur or rust,remove the radiator cap and check for transparency of the coolant,and for rust or fur formation around the radiator throat inside the radiator.

If some rust or fur has formed or the coolant transparency is very poor,the radiator should be cleaned.

a. Cleaning the radiator inside.

-Clean with a detergent When cleaning the radiator with a detergent, follow the instructions given by its manufacturer. Different detergents have different characteristics.

b. Cleaning the radiator exterior

- Cleaning the net (wire mesh)

After the tractor has been operated in dusty conditions,check the net daily and clean it if necessary.

-Cleaning the radiator cores

Clean the radiator cores by applying water spray or compressed air so as to for a right angle with the radiator cores,moving water application in parallel.

Note:

When cleaning the radiator cores with pressurized water,be sure to apply it at a right angle to the cores. Slanted application might deform their cooling fins.

FIG.3-5

-Place the radiator upside down and supply pressurized water from a faucet to the lower tank, draining through the upper tank,as shown in the figure to wash out accumulated deposits.

3) Visual inspection of the exterior parts

When the radiator exterior is corroded,cracked,or badly damaged,replace the radiator.Also replace damaged or fatigued water hoses. Retighten loose hose clamps securely if water is leaking through the hose clamps securely ,or replace them if necessary.

4) Inspection of the radiator cap.

Check the radiator cap to see if it functions normally,using a radiator cap tester as following.

FIG.3-6

FIG.3-7

3-4

Pressure valve

Opening pressure

0.9 Kgf/ ㎠ (12.79 psi)

Vacuum valve

Opening pressure

0.04-0.05 Kgf/ ㎠ (0.57-0.71psi)

-Function test: The pressure type radiator cap has a pressure valve

and a vacuum as shown in the figure. Both valves are held against there seats by springs

while the pressure in the cooling system remains within a specified range,thus keeping the cooling system air-tight.

When the pressure in the radiator rises higher than the specified valves,it overcomes the force of the pressure valve spring and open the pressure valve to release excess pressure through the overflow pipe as shown in the figure.

6. RADIATOR REASSEMBLY

Reassemble the radiator in the reverse order of disassembly.

Note:

- The rubber hoses should be clamped securely and must not interfere with the cooling fan.

- The radiator cores must not interfere with the cooling fan.

7. DAILY INSPECTION

1) Coolant level inspection and coolant

replacement

When the radiator is hot after operation,be sure

to wait until the coolant cools down sufficiently before removing the radiator cap. If this is not done,heated vapor might burst out and cause burns.Use fresh water from a faucet as the coolant. When the coolant is replenished or changed,let the engine idle for a while for the coolant to circulate sufficiently in the cooling system and replenish if necessary after stopping the engine.

2)Antifreeze

When The weather is cold,use an antifreeze to prevent the engine from freezing.The freezing

FIG.3-8

When the coolant temperature falls enough to cause the vapor to condense in the cooling system and decrease the coolant volume,the radiator pressure becomes negative.When this occurs,the vacuum valve opens to let outside air into the radiator as shown in the figure,

thus preventing the radiator from being deformed.

FIG.3-9

point differs according to the mixture ration of

water and antifreeze.Therefore,prepare an antifreeze solution which will have a freezing point 5℃ lower than the estimated lowest atmospheric temperature in your environment.

Precaution for filling antifreeze.

- The radiator interior should be washed clean ahead of time.

- As concerns of mixing ratio of an antifreeze, follow its manufacture's instructions.

- Antifreeze should be blended well with water before filling.

- When the coolant level is lowered due to evaporation,maintain the level by adding water, not by using an antifreeze solution.

- When the coolant level is lowered due to leaks, maintain the level by adding an antifreeze solution of the same mixing ratio.

- As antifreeze corrodes point,take care not to spill it on painted parts.

-The tractor is filled with a permanent type antifreeze (Mobile Long Life Coolant)

when shipping(mixing ratio:50%)

3- 5

8. TROUBLE SHOOTING

Problems Causes Countermeasures

1) Overheating (1) Low coolant level (1)Replenish coolant and inspect water leaks.

(2) Fatigued pressure valve spring (2)Replace radiator cap. (3) Loose or broken fan belt (3)Adjust belt tension or replace. (4) Oily fan belt (4)Replace. (5) Poor thermostat (5)Replace. (6) Poor water pump or water leaks (6)Repair or replace. (7) Clogged water passages (7)Clean radiator and water

passages. (8) Improper injection timing (8) Adjust injection timing. (9) Clogged air ways (9) Clean radiator exterior. (10) Fuel gas enters water jacket due

to broken cylinder gasket

(10) Inspect cylinder head and

replace cylinder gasket

2) Overcooling (1) Poor thermostat (1)Replace (2) Excessive low atmospheric

temperature

(2) Decrease radiator working area

by radiator masking.

TABLE 3-1

temperature

by radiator masking.

3)Lose of coolant (1) Leaking radiator (1)Repair or replace (2) Loosely clamped or broken water

hose

(2)Retighten or replace

(3) Fatigued pressure valve spring (3)Replace radiator cap (4) Leaking water pump (4)Repair or replace (5) Water leakage through cylinder

head gasket

(5) Inspect cylinder head and

Replace gasket

(6) Cracked cylinder head or body (6)Replace

4) Noisy cooling

fan

(1) Poor water pump bearing (1)Replace (2) Loose or bent fan (2)Retighten or replace (3) Unbalanced fan (3)Replace. (4) Poor fan belt (4)Replace.

3- 6

SECTION 2. AIR CLEANING SYSTEM

1.GENERAL DESCRIPTION

Unfiltered air contains many particles harmful to the engine such as dust ,sand,or other foreign matter.

When such foreign matter have entered in to the engine,They have mixed into the lubricant and promote

wear of lubrication parts in addition to damaging the piston cylinders.To eliminate these harmful particles,an air cleaner has been installed.The air cleaner Which is installed on the T series tractor is a dry,cyclone type and is constructed as shown in the figure.

Under the influence of suction generated by the engine,unfiltered air flows through air inlet tube and is

forced into a high-speed centrifugal motion.By this circulating action most of the dust and dirt particles

are separated from the air and collected in the dust unloading valve(4).The remaining dust is removed as

the air flows through the paper element(2) before being drawn into the engine.

3-7

① Body ② Paper element outer ③ Cover assy ④ Dust unloading valve

FIG.3-10 Air Cleaner

2.ELEMENT AIR CLEANER

(1) SPECIFICATIONS.

Model T303HST/T353HST Type Dry, paper element filtering type Rated intake air volume(㎥/min .(cu.ft/min)

4.25(150)

Air venting resistance (㎜Aq)

120 or less Cyclone efficiency (%) 45 or over Total filtering efficiency(%) 99.9 or over Dust holding capacity (gr) 700 Filtering area (㎡)(sq.in) 1.89±4% Filter material FPG 057512 Temperature

-30~80°C

(2) DISASSEMBLY

1) Element removal

3-8

1.Air cleaner Sub assembly 1-01.Body assy 1-02.Body 1-03.Cover 1-04 Cover assy

2.Bracket comp ,guide

3.Hose,air inlet

4.Hose,air outlet

5.Clip,64

6.clip,60

7.Bolt

8.Plate ,stay

Remove the wing bolt which clamps the paper element and take out the element.

FIG.3-11

3. INSPECTION OF EACH PART

1) Inspection of the cleaner body (1) Check the cleaner exterior for cracks,

deformation,or damage and repair or replace if necessary.

(2) Check each packing for fatigue or damage

and replace if necessary.

2) Inspection of rubber hoses Check the rubber hoses for fatigue or damage and replace if necessary.

Note:

Especially note the glue portions of the paper and metal parts.

4. CLEANING THE AIR CLEANER

Clean the air cleaner after 100 hours of operation or less depending on conditions in the following manner.

1) When the air cleaner is cleaned or the element is replaced,dust accumulated inside the air cleaner body should be removed with a cloth.As inhaled dust causes

engine wear,remove a dust accumulated inside the inlet

pipe,the rubber hose which connects in the inlet pipe and the air cleaner,the inlet manifold,and inlet port.

(1)When accumulated dust is dry.

-When removing the dust in the element,hold the element by a hand and pat the side wall with other hand. Never hit the element against a stone or a concrete wall because that might cause its side wall to peel off.

-apply compressed air from inside of the element to blow dust off while turning the element by hand.

3) Inspection of the paper element to check

the element for damage,Dry it sufficiently after washing and put an electric bulb in to the element and look for damage.

FIG.3-12 Element check

Note: The compressed air to be applied should not have a pressure of more than 7㎏/㎠(99.6psi) Maintain sufficient distance between the air gun

and the element.

(2)When accumulated dust is oily.

-Use a solution of TC 101 element detergent or the quality household neutral detergent. Leave the element in the solution for approximately 30 minutes and then wash it by dipping it in and out of the solution.

3-9

FIG.3-13 Element

-After soaking,rise it in fresh water.

-Let it in a shaded and well ventilated place. Forced drying by heat or compressed air is prohibited.

Note: Water applied to rinse the element should not have a pressure of more than 2.8kgf/㎠

㎠㎠

㎠

(39.8psi). An element which has been washed 5 times must be replaced with a new one.

5.ELEMENT INSTALLATION

Install the element in the reverse order of disassembly,but follow these instructions.

1) Each tightening clamp must be secured and care must be taken not to miss the packing and washers.

2) Before installing the element,clean the rubber packing on the top of the element.

Note:

The clamp retaining the element should be

tightened sufficiently so that it will not become

loose during operation

3-10

CHAPTER 4

HST system

SECTION 1. SPECIFICATIONS------------------------------------------

1. Special or essential tools -------------------------------------------------------------

2. Other materials -------------------------------------------------------------------------

SECTION 2. COMPONENT LOCATION-------------------------------

1. Hydraulic hoses and lines ------------------------------------------------------------

2. Hydrostatic transmission -------------------------------------------------------------

3. Transmission main pump case-------------------------------------------------------

4. Transmission back plate and motor------------------------------------------------

5. Hydrostatic control linkage ----------------------------------------------------------

6. Hydrostatic system schematic -------------------------------------------------------

SECTION 3. TROUBLE SHOOTING------------------------------------

SECTION 4. DIAGNOSTICS----------------------------------------------

4-1

4-2 4-2

4-3

4-3 4-4 4-5 4-6 4-7 4-8

4-10

4-11

SECTION 5. THEORY OF OPERATION

------------------------------

1.HYDROSTATIC SYSTEM -------------------------------------------------

SECTION 6.TESTS AND ADJUSTMENTS ---------------------------

1. Hydrostatic pedal and neutral adjustment ------------------------------------

2. Hydrostatic pump pressure test --------------------------------------------------

3. Charge pump pressure test --------------------------------------------------------

4. Hydraulic system bleed procedure ----------------------------------------

SECTION 7.REPAIR ------------------------------------------------------

1. Tractor splitting (Front) -----------------------------------------------------------

2. Hydrostatic transmission removal & installation ----------------------------

3. Hydrostatic transmission disassembly -------------------------------------------

4. Hydrostatic pump disassembly ---------------------------------------------------

5. Hydrostatic pump inspection -----------------------------------------------------

6. Hydrostatic pump assembly ------------------------------------------------------

7. Hydrostatic Motor disassembly --------------------------------------------------

8. Hydrostatic Motor assembly ------------------------------------------------------

4-12

4-13

4-13 4-14 4-15

4-16

4-17 4-23 4-24 4-26 4-29 4-30 4-32 4-35

SECTION 1. SPECIFICATIONS

General

Hydraulic Reservoir Capacity----------------------------------------------------------------35ℓ (9.24 us gal) Pump or motor Roller Bearing( From back plate to Top surface of bearing)-------

--------------------------------------------------------------------- 2.3 mm±±±±0.2 mm(0.090 ±0.010 in)

Roller Bearing in Motor Housing(Recess From Top of Counter bore) ----------------

-------------------------------------------------------------------- 2.0 mm±±±±0.3 mm(0.078 ±0.015 in)

Spring pin in Back plate(From Back plate to Top surface of pin)-------------------- 4.4 mm(0.017 in)

HYDROSTATIC PUMP

Manufacturer---------------------------------------------------------------------------------------------EATON Type ---------------------------------------------------------------------------------------------------piston pump Model---------------------------------------------------------------------------------------------------77122RAA Displacement(Variable)(maximum/rev0----------------------------------------- 40.6㎤ /rev(2.48 in³/rev) Displacement(Engine at 2700rpm)------------------------------------------------- 109.7L/min(28.99 gpm) Pressure relief Valve setting -------------------------------------------------------------- 41368 ㎪(6000 psi)

HYDROSTATIC MOTOR

TORQUE SPECIFICATIONS

Pump to back plate mounting Cap Screws----------------------------------------- 37-42 N.m(27-31 lb-ft) Motor to Back plate mounting Cap Screws-------------------------------------- 10-14 N.m(87-123 lb-in) Forward and Reverse pressure Relief valve--------------------------------- 135-149 N.m(100-110 lb-ft) Charge pressure Relief Valve-------------------------------------------------------- 37-47 N.m(27-30 lb-ft) Charge pressure Diagnostic port plug-------------------------------------------- 13-16 N.m(115-142 lb-in) Pump side Passage Plugs on back plate----------------------------------------- 13-16 N.m(115-142 lb-in) Motor side Passage Plugs on back plate-------------------------------------------- 28-33 N.m(21-24 lb-ft) Transmission to tunnel Mounting Screws--------------------------------------- 126-154 N.m(95-115 lb-ft) Tunnel to flywheel housing--------------------------------------------------------126-154 N.m(95-115 lb-ft) Tunnel to rear transmission housing----------------------------------------------126-154 N.m(95-115 lb-ft) SCV pressure Tube to pump----------------------------------------------------------- 55-79 N.m(40-59 lb-ft) SCV pressure Tube to SCV------------------------------------------------------------ 55-79 N.m(40-59 lb-ft) SCV Work port Tubes to SCV---------------------------------------------------------40-57 N.m(30-43 lb-ft) Charge pressure Tubes to transmission Adapters----------------------------------- 55-79 N.m(40-59 lb-ft) Cam plate bearing Caps Cap screw--------------------------------------------------- 37-42 N.m(27-31 lb-ft) Tunnel Section to Differential housing Cap Screws----------------------------126-154 N.m(95-115 lb-ft) Tunnel Section to Clutch Housing Cap Screws--------------------------------- 126-154 N.m(95-115 lb-ft)

4-1

1.SPECIAL OR ESSENTIAL TOOLS.

Note; Order tools according to information given in the U.S SERVICE-GARD ™ Catalogue or in the European Microfiche Tool Catalogue(MTC)

Parts number parts name JT07335-1,2,3 Splitting Standard and Brackets JT03344 2,000 Kpa(300 psi) Gauge JT03362 68947KPa (10,000 psi) Gauge JT03364 Hose with quick coupler JT03017 Hose with quick coupler JT03240 7/16-20M 37°X7/17-20 F 37 ° Elbow JT03264 Quick coupler F7/16-20 F 37 ° Adaptor JT05480 Quick coupler MXM14-1.5 ORB Adapter

2.OTHER MATERIALS

Number Name Use

U.S.A/Canadian

Petroleum Grease John Deere Clean and cure primer pump and Motor Reassembly TY16021 John Deere High Flex Form-in-place Gasket Hydrostatic Transmission to

Tunnel Seal

TY15934 John Deere General Purpose Gasket Dressing Sealing Gasket and Hoses

4-2

SECTION 2. COMPONENT LOCATION

1.Hydraulic Hoses and lines.

1.hydraulic oil cooler

2. Gear pump

3. Cooler return Line

4. Steering Control Unit

5. Hydrostatic Unit

4-3

2.Hydrostatic transmission

1. Input shaft From engine

2. Control Lever

3. Back Plate

4.Hydrostatic motor

7. Charge pressure relief Valve

8. Filter mount port

9. For,&Rev.Relief valves

10. Hydrostatic pump

4-4

3. Transmission main pump case

1. Cap screws (6) 2. Washers(6) 3. Cover 4. Seal 5. O-ring 6. Bearing

7. Shims 8. Housing 9. Cam plate 10. Cam washer 11. Rotating Assembly

12.Valve plate 13. Bearing(4) 14. O-ring 15. Cover 16. Plug 17. O-ring

18. Bearing 19. Snap ring 20. Thrust Washer 21. Thrust Bearing

22. Thrust Washer 23. Snap ring 24. Seal Washer 25. Seal

26. Snap ring 27. Shaft

4-5

4. Transmission back plate and motor

1.Bearing 2.Gasket 3. Pin 4. Pin 5.back plate 6. Cap screw 7.Bearing

8.plug and O-ring 10.Spring 11. Poppet 12.Spring 13. Plunger 14.poppet

15.Spring 16.Shims 17. O-ring 18.Plug 19.Filter head 20. O-ring

21.Relief valves,Forward and reverse 22. Plugs 23. Valve plate 24. Rotating assembly

25. Cam washer 26.Motor housing 27. Cap screw 28.Bearing 29.Shaft

30.Snap ring(2) 31.Thrust Washer 32.Thrust bearing 33. Seal washer

35.Snap ring

4-6

5.Hydrostatic control linkage

1.Holder comp

2.Bolt

3.Washer spring

4.Washer plain

5.Nut

6.Rod comp

7.Nut

8.Nut

9.Elbow,LH

10.Elbow,RH

11.Washer spring

12.Nut

13.Pin

14.Pin

15.Snap ring

16.Snap ring

17.bolt

18.Arm comp

19.Arm comp

20.Plate reverse

21.Washer plain

22.pin,split

23.Arm,cam

24.Arm,cam

25.Bush(20X23X20)

26.Bolt

27.Bearing ball

28.Washer plain

29.Nut

30.Snap ring

31.Nipple

32.Spring return

33.Bolt

34.Nut

35.plate,forward

36.Bolt

37.pin,oil damper

38.Washer spring

39.Damper oil

40.Bolt

41.Washer plain

42.Pin,snap

43.pedal comp(forward)

44.Bolt

45.Pedal comp(Reverse)

46.Pad

47.Bolt

4-7

6-1. Hydrostatic system schematic

4-8

6-2. Hydrostatic system schematic

4-9

SECTION 3. TROUBLESHOOTING

Problem or symptom

Check or Solution

Wheels on machine will not

rotate

Noisy pump or Motor

Sluggish response to changes

in speed

Low power

Wheels rotate in one direction

only

Tractor moves without

pressing forward or reverse

pedal

Tractor Does not Move when

Forward or Reverse pedal are

Pressed

Check flex plate coupling between engine and pump

•

Hydraulic level low in transaxle

• • •

Low charge pressure (see Tests and Adjustments Section)

• • •

Main drive pressure relief valve stuck open(see Test & Adjustments section)

• • • •

Air in system(see”HYDRAULIC SYSTEM BLEED PROCEDURE” on page 20)

• • •

Hydrostatic motor output pressure too low

(see tests and Adjustments section)

• •

Internal pump or motor damage or excessive wear

• • • •

Parking brake engaged or malfunctioning

• •

Pump centering mechanism not properly adjusted

• • •

Gear box malfunction (see gear power Train section)

•

Servo valve malfunctioning

• • •

Pedal neutral position Not properly Adjusted

•

Hydrostatic Control linkage Worn out or Damaged

• • • •

4-10

SECTION 4. DIAGNOSTICS

Test conditions:

- Operator in seat

- Key switch in RUN position

Test/Check point Normal If Not normal

1. Control pedals Pedal should move freely Check linkage from pedals to pump

Test conditions:

- Start engine and run at slow idle

Test/Check point Normal If Not normal

2. Directional pedals are in neutral position

Machine should not creep forward or backward

Adjust centering of pump control pedals

3.Move forwards or

reverse pedal slowly from neutral to

Machine should accelerate smoothly forward or backwards.

Check fluid reservoir for proper fluid level.

Check hydraulic tubing,and

connections for leaks.

maximum travel speed

position

connections for leaks.

Perform system flow and pressure checks to verify proper operation of charge pump and hydrostatic pump

4. Control pedal in full forward position

Machine should move forward

Check pedals and forward/reverse linkage for damage.

Check forward drive pressure relief valve

5. Control pedal in full reverse position

Machine should move

backward

Check pedals and forward/reverse linkage for damage.

Check reverse drive pressure relief valve.

4-11

SECTION 5. THEORY OF OPERATION

HYDROSTATIC SYSTEM

Function:

The hydrostatic system provides a means to transfer Power from the engine to the final final drive to the wheels.it also provides infinitely variable speed control,forward or reverse,by foot pedal operation.

Principles of Operation:

The hydrostatic system is a closed loop fluid power system that consist of a charge pump on the left front side of the engine.and an EATON piston

pump/motor assembly, which is driven by a Flexible coupler Attached to the flywheel.

Fluid flow is controlled by by changing the angle of

the cam plate. This angle is controlled by the

Charge pump

The charge pump is a gear type positive displacement pump mounted to the right front side of the engine. This pump provides pressurized fluid to the SCU (Steering Control Unit). Return oil from the SCU

is routed through the filter mounted to the front of the back plate, and then into the hydrostatic pump to provide replacement fluid to the hydrostatic pump.

Hydrostatic Motor

The hydrostatic motor is an EATON high torque axial piston motor.The motor is located on the rear of the back plate.The hydrostatic motor

drives the input shaft for a three speed range gear

the cam plate. This angle is controlled by the

operator through a mechanical linkage.Moving the respective directional pedal will move the position of the cam plate.

Moving the cam plate off center changes the distance the pistons travel inside the piston bore of rotating assembly.The direction that the cam plate is rotated from center determines the direction of fluid Flow (forward or reverse).The number of degrees the cam plate is deflected.determines how much fluid will be displaced(speed)

The hydrostatic pump provides hydraulic fluid to the hydrostatic motor through the back plate.Hydraulic fluid in the power train circulates in a closed loop. Fluid leaves the hydrostatic motor and is returned to the hydrostatic pump,not the reservoir.Fluid that leaves this closed loop circuit,such as case drain, is replenished by fluid from the charge pump.

drives the input shaft for a three speed range gear

transmission which transfers power to the wheels. (See Final Drive Section)

4-12

SECTION 6. TESTS AND ADJUSTMENT

1.HYDROSTATIC PEDAL AND NEUTRAL ADJUSTMENT

Reason:

To ensure that tractor does not move unless forward or reverse pedal is depressed.

Procedure:

1.Operate the hydrostatic control pedals.They should

return by themselves to the neutral position.If pedals do not operate properly,check pedals and linkage for damage or wear.

2.Start engine and run at low idle.

3.Place range shift lever in LOW gear. Tractor

should not move.If tractor moves,note direction, and adjust neutral return lever as follows:

6. loosen the locking nut that holds the rod and the elbow to the transmission.

7.Using a wrench,Turn the rod to move

the rod down to eliminate reverse,or up to eliminate forward movement .

4.Shut engine OFF,engage park brake.

5. On the right side of the tractor,below the forward and reverse control pedals,locate the rod .The rod must be turned to perform the neutral adjustment

8.Tighten the elbow and the nut .

9.start engine and run at low idle.

10.Place range shift lever in LOW gear.Tractor should not move.If tractor moves,repeat steps 4 through 11 until movement is eliminated.

4-13

2. HYDROSTATIC PUMP PRESSURE TEST

Reason:

To ensure that internal parts of the hydrostatic pump are not worn excessively,and the relief valves are operating properly.

Equipment:

JT03362 68947KPa (10,000 psi) Gauge JT03364 Hose with quick coupler JT03240 7/16-20M 37°X7/17-20 F 37 °

Elbow

JT03264 Quick coupler F7/16-20 F 37 °

Adaptor

JT05480 Quick coupler MXM14-1.5 ORB

Adapter

4.Start engine and run until hydraulic oil is warm.

5.Stop engine

6.Cycle all controls to relieve any pressure

that may be in the hydraulic system

7.Locate test ports on hydrostatic transmission inside tunnel opening.

8.Remove test port plugs.

9.Install one JT05480 male quick coupler

into each test port.

10.Attach JT03362 gauge and hose assembly

as shown each test port adapter

IMPORTANT: Make sure that the hydraulic fluid

is visible in sight glass.Insufficient hydraulic fluid could cause system to run dry and damage pump and motor.

IMPORTANT: Do not allow valves to relieve for

more than 10 seconds or hydraulic oil may overheat.

Procedure:

1.park tractor on a level surface

2.Turn key switch to OFF position.

3.Make sure 4WD lever is in unlocked 2WD position.

11.Position gauges so they can be read from operator’s seat.

12. Perform test from operators seat.Make sure park brake in engaged and press right and left brake pedals.Place range transmission shift lever in 3 (high) position.Start engine and run at full throttle.

4-14

13.Slowly depress forward directional pedal and observe gauge.Gauge should slowly rise to approximately 41368 KPa±±±±1378KPa

(6000psi ±200psi)and relief valve will open with an audible squealing noise.

14.Repeat same procedure with reverse pedal.

Specifications:

-Pump pressure should reach approximately

41368 KPa±±±±1378KPa (6000psi ±200psi) in either direction and then relieve.

Results:

-If pressure will not reach 41368 Kpa Maximum

(6000psi) in either direction,check charge Pressure.(SEE ”CHARGE PUMP PRESSURE TEST on page 14 )

-If charge pressure is good and hydrostatic pump

pressure will not get up to relief pressure

hydrostatic pump is worn or damaged.

-If pressure reaches 41368KPa(6000psi) in one

direction and not the other,one of the relief valves is defective or the seat is leaking.

3.CHARGE PUMP PRESSURE TEST

Procedure:

1.Park tractor on a level surface and set park brake.

2.Turn key switch to OFF position.

3.Shift transmission to NEUTRAL.

IMPORTANT:Make sure to relieve system

pressure before loosening any system lines or hoses.

4. Cycle all controls to relieve any pressure that

may be in the hydraulic system.

3.CHARGE PUMP PRESSURE TEST

Reason: To ensure that charge pump is operating at

specified pressure to supply oil to hydrostatic pump. Equipment:

JT03344 2,000 Kpa (300 psi) Gauge JT03017 Hose with quick coupler JT03240 7/16-20M 37°X7/17-20 F 37 °

Elbow

JT03264 Quick coupler F7/16-20 F 37 °

Adaptor

JT05480 Quick coupler MXM14-1.5

ORB Adapter

NOTE:4WD shaft removed for clarity

5.Underneath the tractor,at the front of the tunnel ,locate the hydrostatic transmission, Remove the plug in the charge pressure test port.

6.Assembled test equipment as shown and install to test port.

7.Start engine and run at high idle (2500~2700rpm).

8.Check pressure reading gauge.

Specifications: Charge Pressure------1723-2068KPa(250-300psi).

Results:

-Charge pressure should reach 1723-2068KPa (250-300 psi) cannot obtained;the mesh inlet filter may be restricted,the suction line may be restricted or leaking air,or front hydraulic pump may be defective

4-15

4. HYDRAULIC SYSTEM BLEED PROCEDURE

Reason:

To remove air trapped in the hydraulic system which will prevent proper operation. Procedure:

IMPORTANT: If contamination is found in

hydraulic system filter or inside reservoir,flush entire hydraulic system.

NOTE: Fill the hydraulic oil filter with new oil

before installing.

1.Install a new hydraulic oil filter.

2.Fill the transaxle with specified and recommended Transmission oil to the proper level in sight glass.

3.Disconnect in plug to fuel shutoff solenoid.

4.Turn the key to START and hold for 10 seconds.Turn the key to OFF.

5.Reconnect wires to fuel shutoff solenoid.

6.Raise tractor front end and support on suitable stands.

7.Start the engine and run at low idle.

IMPORTANT

:If steering fails to respond, or

pump pressure is not being delivered to steering

control unit(SCU),shut engine off and check to see that steering hoses are connected to the correct SCU ports.

8.Slowly turn the steering wheel left and right

until wheels turn smoothly indicating that any trapped air has been bled back to the reservoir.

IMPORTANT:If rock shaft fails to react to lift

control lever movement,shut engine off and check hose clamps on suction tube elbow and manifold to ensure that they are properly tightened.

9.Operate rockshaft several times until it operates smoothly.

10.Stop the engine and check the hydraulic reservoir oil level.Fill as needed.Check all line connections for leaks;tighten if necessary.

11.Lower the tractor to the ground.

12.Drive tractor in forward and reverse several

times until transmission operates smoothly.

4-16

SECTION 7. REPAIR

1.TRACTOR SPLITTING (FRONT)

Note: It is not necessary to remove the flywheel

housing from the engine unless engine is being removed.Split the tractor between the tunnel and flywheel housing as outlined in the story below.

Prepare the Tractor:

1.Remove any mid or front attachments and mid .

2.Park tractor on a level surface.Engage park brake,shut off engine.

3.Disconnect battery negative terminal.

4.Remove floor mat.

5.Remove the operator’s platform.

6.Remove LH and RH closeout panels.

7.Remove seat and seat platform.

8.Remove fenders.

9.Cycle all hydraulic controls to relieve system

pressure.

13.Disconnect two work port tubes form SCV

14.Remove two cap screws and two spacers that attach tube support bracket to frame. Remove

To avoid injury from escaping

Note: Hydraulic reservoir contains approximately

26L(6.8gal) of oil.Have a suitable container ready to catch drain oil.

10.Drain hydraulic reservoir.

11.If tractor is equipped with SCV,raise RH rear of tractor and support on suitable stands.

12.Remove RH rear wheel and tire.

tube support bracket and as an assembly.

15.Install RH rear wheel and tire.

16.Locate and disconnect all electrical connectors attaching wiring harness switches and lights on rear half of tractor.Unfasten wiring harness from cable clips and move harness away from rear half of tractor.

4-17

CAUTION:

hydraulic oil under pressure ,relief the

pressure in the system by stopping the engine and operating all hydraulic control valves.

All electrical connectors attaching wiring harness switches and lights on rear half of tractor.

All electrical connectors attaching wiring harness switches and lights on front half of tractor.

4-18

Brake rod.

17.Disconnect lower brake rods at rear brake levers.

18.Remove turnbuckle at front of lower brake rods, and remove brake rods from tractor

Turn buckle

19.Disconnect hydraulic pressure tube at lower Left side of Transmission

Magnetic cruise

22.Disconnect hydraulic supply tube at SCV or manifold block,Remove tube.

20.Remove hydraulic pressure tube clamp

21.Remove magnetic cruise at front transmission

23.Remove 4WD drive shaft and couplers by removing snap ring and sliding couplers onto shaft until clear of stub shaft

4-19

24.Remove hydraulic filter.

25.Disconnect two hydraulic charge pressure tubes from hydrostatic transmission

28.Disconnect switch connector

Rod

26.Loosen hose clamp and disconnect suction tube from manifold.

NOTE:Tractor shown split for clarity.

27.Disconnect rod from hydrostatic control linkage.

29 .Remove 5 screws connecting tunnel to

flywheel housing.Note length and location of screws when removing.

IMPORTANT: Check for ,and disconnect any

additional accessory wires or hydraulic tubes connecting rear half to front half before splitting tractor.

30.Release park brake and place gear shift in NEUTRAL.

31.Gently pry around edges of flanges to separate tractor halves.

32.Roll tractor halves apart.

4-20

Assemble Tractor Sections.

NOTE:Splines on all drive shafts and couplers

must be aligned before tractor sections are bolted together.

1.Align splines on hydrostatic transmission drive shaft and engine fly wheel.

2.Move tractor sections together and retain with

5 screws.Tighten bolts to 90-110N.m.

3.Remove screws retaining splitting stands to tractor sections.Remove splitting stands.

NOTE: Tractor shown split for clarity.

6.Connect suction tube to manifold.Tighten hose clamp

7. Connect two hydrostatic charge pressure tubes

to hydrostatic transmission.Tighten to 40-57N.m (30-43lb-ft).Check opposite ends of both tubes to make sure they are tight.

8. Install a new hydraulic oil filter

4.Install rod as an assembly.Attach turn buckle to hydrostatic control linkage and retain with nut.

5.Connect switch connector

9. Install 4WD drive shaft and couplers. Slide couplers onto shafts,and retain with snap ring

4-21

10. Install hydraulic supply tube to tractor. Connect hydraulic supply tube to SCV. Tighten tube nut to 55-79N.m(40-59lb-ft).

11.Connect hydraulic pressure tube at lower Left side of Transmission

14.Connect lower brakes rods to rear brake levers.Retain with turn buckle and nuts.

Rod

12.Install hydraulic pressure tube clamp

13. Install brake rods to brake bell cranks. Retain with specified length

Turn

buckle

15.Route wiring harness through cable clips. Locate and connect all electrical connectors attaching wiring harness to switches and lights on rear half of tractor.

16.Install SCV tube support bracket and tubes as an assembly.Install two cap screws and two spacers to attach tube support bracket to frame.

17.Raise RH rear of tractor and support on suitable stands.Remove RH rear wheel and tire.

Brake

rod

4-22

18.Connect four work port tubes to SCV. Tighten tube nuts to 40-57N.m(30-43 lb-ft).

19.Connect battery negative terminal.

20. Install fenders.

21.Install seat and seat platform

22.Install LH and RH closeout panels.

23.Install operator’s platform.

24. Install floor mat.

25.Refill hydraulic oil reservoir to proper

level.

26.Bleed air from hydraulic system (See HYDRAULIC SYSTEM BLEED

PROCEDURE)

2.HYDRAULIC TRANSMISSION

REMOVAL & INSTALLATION

Removal:

1.Park tractor on level surface.Stop engine

and release hydraulic pressure by operating all controls.

NOTE: Drive shaft may come out with

transmission.If removed with transmission,remove from transmission,and install into tunnel and range transmission.

Installation:

Installation is the reverse of removal.

- Clean flanges of transmission and tunnel before applying sealant.

- Apply TB1215 sealant to flanges of

transmission where it contacts the tunnel.

- Tighten the screws attaching transmission to

tunnel to 126-154 N.m(95-115lb-ft).

IMPORTANT:

If neutral adjustment locking screws was loosened,neutral adjustment procedure must be

performed. See “HYDROSTATIC PEDAL

AND NEUTRAL ADJUSTMENT”

CAUTION

To avoid injury from escaping hydraulic oil under pressure ,relief the pressure in the system by stopping the engine and operating all hydraulic

2.Separate tractor engine and tunnel sections. (See TRACTOR SPLITTING(FRONT).

3.Remove two cap screws,two spacers,and

two lock nuts,and disconnect transmission forward and reverse control rods.

NOTE: 1 screw is removed from the top of

the tunnel section ,from the outside.

4. Remove five screws attaching transmission to tunnel section.Note length and location of screws when removing.

NOTE:Oil may drain from the pump and

motor unit after it is removed.Have a suitable container ready to catch excess oil.

5.Gently pry around edges of flanges to break sealant.Remove transmission.

4-23

components

CAUTION

Hydraulic transmission weights approximately 34Kg(751lb).attach a suitable lifting device to transmission before removing screws

3.HYDROSTATIC TRANSMISSION

DISASSEMBLY

4. Remove gasket from pump assembly.

Back plate Disassembly:

IMPORTANT: The pump body and motor body are aluminum and can be easily damaged by steel tools.Be careful to not damage machined surfaces.Do not use screw driver or other sharp objects to pry pump or motor body from back plate.

1.Remove eight socket head screws Securing the hydrostatic motor to the back plate.tap of the motor housing with a plastic mallet to loosen it from the valve plate.Keep the

Cap screws

Hydrostatic

motor

Gasket

Hydrostatic

pump

Spring pin

Dowel pin

Motor valve plate

3.Remove cap screw and nut.Remove holder and arm as an assembly.

NOTE:Pump and motor valve plates are

very similar in appearance,but are not interchangeable.Note shape of valve plates when removing.Valve plates are not fastened to back plate,but may adhere slightly because of oil between the machined surfaces.

5.Remove valve plates from the back plate.

6.Remove two dowel pins.

NOTE:Unless spring pin used to locate

valve plate is damaged or loose,do not remove.If replacement is necessary, Use care not to scratch the machined surfaces of the back plate.

4-24

assembly level or tip output end down to

keep the rotating assembly from sliding off of shaft.Pull the motor housing,shaft,and rotating assembly away from back plate.

2.Remove the four socket head cap screws securing the pump to the back late. Remove pump.

Reverse

Relief valve

Forward

Relief valve

Charge pressure

Relief valve

7.Mark the forward and reverse relief valves and their ports to ensure they go into the correct holes during assembly.Remove the relief valves from the back plate.Clean the relief valves in a suitable solvent,and check for damaged springs or seats.

NOTE: The relief valves are dual purpose valves.

Each valve contains two springs.A weak spring

(check valve when other circuit is in use) and a strong spring(6000psi relief valve).Valves can not be adjusted,and there is no serviceable parts inside. If any malfunction is suspected,replace the relief valve.

8.Examine the relief valve faces,and the seats in the

IMPORTANT:To avoid damage to needle bearings When removing or installing,press only against side of bearing with lettering. When removing bearings from the back plate,be Extremely careful to not damage machined surfaces.

10.Inspect pump side needle bearing.Bearing should spin freely,and needles should not fall out of bearing cage.If replacement is necessary, press bearing out from the motor side of the housing.

11.On the motor side of the back plate,remove the

cooler bypass valve and check for damage or debris in spring or seating areas.Clean or

Valve face

Relief Valve

O-ring

Relief Valve spring

Valve face

Cooler bypass valve

Plug

Filter bypass valve

Needle bearing

8.Examine the relief valve faces,and the seats in the

back plate.The faces of the check valve and the seats in the back plate should be free of burns and defects.

IMPORTANT:Damage to pump may occur if charge

pressure relief valve and cooler bypass valve springs are accidentally swapped.Keep valves and springs separated or label them to prevent mix-up.

9.Remove the charge pressure relief valve and check for damage or debris in spring or seating areas.

Clean or replace parts as required.

replace parts as required.

12.Remove the filter bypass valve and check for damage or debris in spring or seating areas. Clean or replace parts as required.

13.Inspect the motor side needle bearing.Bearing

should spin freely,and needles should not fall out of bearing cage. If replacement in necessary, remove using a suitable blind hole puller.

14.Remove three plugs from pump side,and one plug from motor side of back plate, and clean out oil passages using a suitable solvent and compressed air.

4-25

Charge pressure

relief valve

Plugs

NOTE: If neutral adjustment cap screw is loosened,neutral adjustment procedure must be

performed.see “HYDRAULIC PEDAL AND

NEUTRAL ADJUSTMENT”

15.Inspect pivot and cam followers on neutral return lever for smooth operation.Replace parts as needed.

Back plate Assembly:

1.On motor side of the back plate,install the

filter bypass valve.Tighten to 16-20N.m

8. If the bearings were removed from the back plate,press new ones into position using a suitable bearing driver.The numbers on the bearing should face the outside of the back plate.press the bearing in until 2.3±0.2 mm (0.09in ±0.010in) of the race remains above the surface of the back plate.

9. If removed,install the spring pin that is used to position the valve plate.Allow the pin to protrude from the back plate approximately

4.4mm(0.17in).

4. HYDRAULIC PUMP DISASSEMBLY

(12-15lb

ft).

NOTE:Cooler bypass valve spring and charge relief valve spring could accidentally be mixed up.Charge relief valve spring is thicker.

2.Install the cooler bypass valve.Tighten to 28-33 N.M(21-24 lb-ft).

IMPORTANT: Old O-rings,gaskets and seals

will leak.Always install new O-rings,

gaskets and seals during assembly.

3.Install new O-ring to plug.Install plug.

Tighten to 13-16N.m(115-142lb-in)

4.On pump side of back plate,install new

O-ring to the three plugs.Install plugs. Tighten to 135-149N.m(100-110 lb-in).

5.Install forward and reverse relief valves in

ports marked at disassembly.Tighten to 135-149N.m(100-110lb-ft).

6. Install charge pressure relief valve.Tighten to 37-41N.m(27-30lb-ft).

7.Install two dowel pins.

IMPORTANT: The pump body is aluminum

and can be easily damaged by steel tools.

Be careful to not damage machined surfaces.

Do not use screw driver or other sharp

objects to pry pump body from back plate.

1.If not already done,remove four socket head cap screws securing the pump to the back plate .Tap pump body with a plastic mallet to remove pump.

4-26

Cap screws

Hydrostatic

motor

2. Remove cap screw and nut.Remove speed control lever and neutral switch as an assembly.

3.Remove gasket from pump assembly.

The following parts will be needed to disassemble

the piston block. 2ea------------3/8 IDX1-1/4 in .OD flat washers. 1ea------------3/8X 5in.N.C. cap screw 1ea------------3/8 in .N.C.nut 1ea------------1/2 in.Drive Socket with 1-1/8 in.OD

6.Place one of the flat washers over the 3/8X 5 in

cap screw.Install cap screw through spline end of piston block so that the washer rests on the three pins.

Gasket

Hydrostatic

pump

Retaining ring

4.Remove the rotating assembly from the housing.

5.If the piston did not come out with the piston block,remove the pistons along with the spider and pivot.

NOTE: Disassembling the piston block assembly is

not necessary unless the spring or pins are damaged.

7.Place the socket,then the washer over the end of the cap screw.

8.Screw on nut and slightly compress the spring

inside the piston block.

9.Using snap ring pliers,remove the internal

retaining ring.

10.Carefully back off nut until spring tension is

relieved.

11.Remove the nut,washer,and cap screw.

4-27

Rotating assembly

12.Remove washers,springs,pins,and pin retainer.

13.Inspect parts for wear or damage.Replace if needed.

Shaft removal and Disassembly:

1.Remove the internal snap ring retaining the seal.

NOTE: Use care when pressing shaft out of

housing to prevent shaft from falling to floor and being damaged.

2. Press the shaft out of the housing from the back plate side until the seal releases from the bore.

1.Remove three cap screws and shaft end cap.

2.Remove three cap screws and pain end cap.

3.Remove bearing cones from both ends of the control shaft.Inspect bearing cones for smooth operation,wear,or damage.Replace parts as needed.

Seal

Internal snap ring

Bearing cone

Bearing cup

Seal

3.Remove the seal and washer.

4.Remove the retaining Ring from the shaft. Remove thrust washers and thrust bearing.

Control disassembly.

4.Replace seal in shaft end cover.

5.Inspect bearing cups for wear or damage.Replace bearings as needed.

6.Remove cam plate from housing.

4-28

Cap screw

Shaft end cap

Plain end cap

Cam plate

7. Remove shim.

8. Remove thrust plate.

9.Inspect needle bearing in housing,If the

2.Inspect the piston block surface that makes contact with the valve plate.This surface should be smooth and free of deep scratches.

3.Check the piston movement in the block bore.If the pistons are sticky in the bore,examine the bore for scoring or contamination.

thrust plate

needle bearing

Wear surface

Shoe face

Spider

Pivot

needles remain in the cage and spin freely, there is no need to replace them,If replacement is necessary,bearing may be removed with a bearing driver.

5.HYDROSTATIC PUMP INSPECTION

1. Inspect the bronze side of the valve plate for wear.Replace the valve plate if

any wear,scoring,or scratched exist.

4.Inspect the outside of the pistons .Replace if scored or worn.

5.Inspect the shoes.Replace if loosed on the ball

end of the piston,or if shoe face area is worn or damaged.

6.Inspect the spider.Replace if worn in the area

where it contacts the pivot.

7.Inspect the pivot.Replace if worn or damaged.

8.Examine the machined surfaces of the back

plate.Replace if scored or damaged.

4-29

valve plate

9.Inspect the shaft for damage on the bearing surfaces or in the splined areas.

10.Inspect thrust bearing and washers for

wear.

11.Inspect the servo piston for scratched and

wear.

12.Replace seal.Replace worn or damaged

parts as required.

6. HYDROSTATIC PUMP ASSEMBLY

1.Clean all parts in a suitable solvent and dry with lint free rag.

IMPORTANT: Due to extremely tight

tolerances and finish of internal surfaces it is very important to maintain absolute cleanliness during pump assembly.Coat all internal surfaces with clean 10W30 motor oil when assembling.

Housing and shaft assembly.

2. Apply a small amount of grease to back of thrust plate and install thrust plate into cam plate.

3. Install shim.

4. Install cam plate assembly into housing.

Numbers out

Recessed in Bore

2.0mm ±0.3mm (0.078 in±0.15in).

Cam plate

1.If the needle bearing was removed from the housing.the new one can be pressed from the outside inward until the bearing race is

recessed in the bore approximately 2.0mm

±0.3mm(0.078 in±0.15in).Be sure that the

numbers on the bearing race are facing to the outside of the housing.

5. Install bearing cones to both ends of the control shaft.

4-30

thrust plate

Bearing cone

O-ring

IMPORTANT:Old O-rings,gaskets,and seals

will leak.Always install new O-rings, gaskets, and seals during assembly.

IMPORTANT:Old O-rings,gaskets,and seals

will leak.Always install new O-rings, gaskets, and seals during assembly.

6. Install new O-rings on shaft end cap and plain end cap..

7.Install plain and shaft end caps.Retain with

three cap screws.

8.Rotate control shaft and feel for smooth

operation.Check for end play.If there is end play,remove shaft end cap and increase shim thickness until there is no end play.

NOTE:Control shaft turning force measurement

10.install the external snap ring,thrust washer, and thrust bearing on the shaft.install the outside thrust washer and external snap ring.

11.Install the washer and a new seal onto the shaft.

12.Install the shaft assembly into the housing. Using the appropriate size socket,or a clean piece of pipe,tap the shaft seal into the bore in

the housing until the seal is below the retaining ring groove.

Secure shaft into housing with internal snap ring.

Rotating assembly installation:

1.If the piston block assembly was disassembled

Cap screw

Shaft end cap

Plain end cap

Seal

Internal snap ring

is taken while shaft is turning. Amount of force

required to begin turning shaft is higher.

9.Using a suitable torque wrench,measure the amount of force required to turn the control shaft.While the shaft is turning,the amount of turning force should be 25±5lb-in.Increase,or decrease the amount of shim on the shaft end of the cam plate until the force required is within the specification.

1.If the piston block assembly was disassembled

complete the following.If not,Skip to step 10.

2.Install the three pins in oversize grooves in spline end of piston block with the heads facing inside of the block.

3.Install the pin retainer.

4.Install the washers and spring.

5.Using same tools used to compress spring during disassembly of block,install washer, spring,second washer,cap screw and nut in the piston block

6.Compress spring.

7.install retaining ring.

8.Remove spring compression tools from the piston block.

4-31

9.Place an appropriate size socket in the hole in the piston block to keep the pivot in

place while installing the pistons.Slide the pivot down so that the flat side rests on the top of the three pins.

10.With the pistons in place in the spider,

lower the pistons into the piston block.

NOTE: It is not necessary to put the pistons

in the original position.Any piston can be installed in any hole.

13.Apply a small amount of grease to the steel side of the valve plate to hold it in place during pump installation.

14.Install pump valve plate on back plate.

15.Place a new gasket on the pump.

16.Install the pump assembly on to the back plate assembly.Make sure valve plate and gasket stay in position.Tighten the socket head cap screws to 37-42N.m(27-31lb-ft).

7. HYDROSTATIC MOTOR DISASSEMBLY

Shoe face

Spider

Pivot

11. Tilt the pump housing so that the open end is facing slightly downward.

12.Slide the rotating assembly up the shaft

until it meshes with the splines on the shaft.

IMPORTANT:The motor body is aluminum

and can be easily damaged by steel tools.Be careful to not damage machined surfaces. Do not use screw driver or other sharp objects to pry motor body from back plate.

1.If not already done,remove motor from back plate.Remove eight socket head cap screws securing the motor to the back plate.Tap the motor housing with a plastic mallet to loosen it from the valve plate.Keep the assembly level or tip output end down to keep the rotating assembly from sliding off of shaft.Pull the motor housing,shaft,and rotating assembly away from back plate.

4-32

Rotating assembly

Valve plate

Cap screws

Hydrostatic

motor

NOTE: pump and motor valve plates are

very similar in appearance,but are not

interchangeable.Note shape of valve plates when removing.Valve plates are not fastened to back plate,but may adhere slightly because of oil between the machined surfaces.

2.Remove valve plate from the back plate.

3.Remove two dowel pins.

NOTE: Unless spring pin used to locate

valve plate is damaged or loose, do

not remove.If replacement is

3. Remove cam washer from back of motor housing.

Shaft Removal and Disassembly.

Spring pin

Dowel pin

Motor valve plate

necessary, use care not to scratch the machined surface of the back plate.

Rotating Unit Removal and Disassembly:

1.Invert the motor and remove the rotating assembly from the housing

2.If the pistons did not come out with piston block,remove the pistons along with the spider and pivot.

1.Remove the internal snap ring retaining the seal.

2.Gently tap the shaft with a plastic hammer until the seal release from the housing.

NOTE: Use care when removing shaft from

housing to prevent shaft from falling to floor and being damaged.

4-33

Seal

Internal snap ring

3. Remove the seal and washer.

4.Remove the retaining ring from the shaft. Remove thrust washers and thrust bearing.

5. Inspect the shaft for damage in the

bearing and spline area.

6. Inspect the thrust bearing and washers for

wear.

3. Remove the seal and washer.

4.Remove the retaining ring from the shaft. Remove thrust washers and thrust bearing.

5. Inspect the shaft for damage in the

bearing and spline area.

6. Inspect the thrust bearing and washers for

wear.

Hydrostatic Motor Inspection

1.Inspect the needle bearings in the back plate and the motor housing.If the needles remain in the cage and spin freely,there is

no need to replace them.

3. Inspect the bronze side of the valve plate for ear,Replace the valve plate if any wear,scoring,or scratches exist.

4.Inspect the piston block surface that

makes contact with the valve plate. This surface should be smooth and free of deep scratches.

5.Check the piston movement in the piston block bore.If the pistons are sticky in the bores examine the bores for scoring or contamination.

Piston shoe

Piston

Piston block

Spider

no need to replace them.

2.If the needle bearing in the motor housing needs to be replaced, it can be pressed out with the appropriate size bearing driver.If

the bearing in the back plate must be replaced it must be pulled out with a slide hammer or blind hole puller.

IMPORTANT: When removing bearing

from back plate,be extremely careful to not damage machined surfaces.

6. Remove the pistons and spider assembly.

7.Examine the outside of the pistons for finish condition.They should not show wear or deep scratches.

8.inspect the piston shoes for a snug fit on the ball end of the pistons.Check the face of the shoes for a flat smooth surface.

9.Examine the spider for wear in the pivot area.

10.Examine the pivot to ensure smoothness

and no signs of wear.

4-34

Wear Surface

Cam washer

11.Inspect the cam washer shoe surface.It should be free of scratches and wear marks.

IMPORTANT: Piston face damage can be

caused by towing unit,dry start-up, or loss of charge pressure.

Piston Block Disassembly:

NOTE: Disassembling the piston block

assembly is not necessary unless the spring or pins are damaged.

The following parts will be needed to disassemble

the piston block. 2ea------------3/8 IDX1-1/4 in .OD flat washers. 1ea------------3/8X 5in.N.C. cap screw 1ea------------3/8 in .N.C.nut 1ea------------1/2 in.Drive Socket with 1-1/8 in.OD

14.Screw the nut on and slightly compress the spring inside the piston block.

15.Use retaining ring pliers to remove the internal retaining ring.

16.Carefully back off tension on nut until spring is slack.

17.Remove the nut,Washer,and cap screw.

18.Remove washers,spring,pins,and pin retainer.

19.Inspect the spring inside the piston block for

damage.Inspect pins for straightness.

8.HYDROSTATIC MOTOR ASSEMBLY

12.Place one of the flat washers over the 3/8X5 in. cap screw through spline end of piston block so that the washer rests on the three pins.

13.place the socket and then the washer over the end

of the cap screw.

IMPORTANT: Due to extremely tight tolerances, and finish of internal surfaces,it is very important to maintain absolute cleanliness during the assembly of the motor.Coat all internal surfaces with clean 10W30 motor oil when assembly

Main shaft Bearing Installation:

Note: All needle bearings are pressed in with

numbers facing out.

4-35

Retaining ring

Needle Bearing

(numbers facing out)

1. If the bearings were removed from the back plate, a new one can be pressed in,Numbers up,using the correct size bearing driver.

The back plate bearing should be pressed in

until 2.3±0.2 mm (0.09in ±0.010in) is left above the bore.

2. If spring pin that is used to position the

valve plate was removed or damaged,install a new one.Allow the pin to protrude from the back plate approximately 4.4mm(0.17 in)

Cam plate and shaft Installation

4.Apply some grease to the “THIS SIDE DOWN” side of the cam washer before installing into motor housing so it will stay in place while installing rotating assembly.

5.Install the inside snap ring,thrust washer,and thrust bearing on shaft.Install the outside thrust washer and snap ring.

6.Install the shaft into the housing.Install the

washer and the new shaft seal.Secure them with the retaining ring.

Rotating Unit Assembly and Installation:

1.If the piston block assembly was

Numbered end

3.The housing bearing should be pressed on the numbered side,from the outside of the housing inward.Until the numbered end is recessed 2.0mm ±0.3mm(0.078±0.015in) in the housing bore.

disassembled complete the following.

If not , skip to step 10.

2.Install the three pins in oversize grooves in spline end of piston block with the heads facing inside of the block.

3.Install the pin retainer.

4.install the washers and spring.

5.Using same tools used to compress spring during disassembly of block install washer, spring,second washer,cap screw and nut in the piston block.

6.Compress spring.

7.Install retaining ring.

8.Remove spring compression tools from the

piston block

4-36

9.place an appropriate size socket in the hole in the piston block to keep the pivot in place while installing the pistons.

10.With the pistons in place in the spider,

lower the pistons into the piston block.

NOTE:It is not necessary to put the pistons

in the original position.Any piston can be installed in any hole.

13.if removed,install the spring pin in the back plate used to retain the valve plate.

Allow the pin to protrude from the back

plate approximately 4.4mm(0.17 in)

14.If removed, install two dowel pins.

15.Apply a small amount of grease to the steel side of valve plate to hold it in place for installation.Place the valve plate in position on the back plate with steel side against back plate.

IMPORTANT: Install motor housing with

cam plate slope marking as shown.

Shoe face

Spider

Pivot

Cam plate slope marking

11.Tilt the motor housing so that the open end is facing slightly downward.

12.Slide the rotating unit up the shaft until it meshes with the splines on the shaft.

If installed incorrectly the tractor

will go backwards when forward pedal in depressed.

16.install the motor assembly onto the back plate assembly with the cam plate marking as shown.

Make sure that the valve plate and cam washer stay in position.

IMPORTANT: Damage to pump may occur

if retaining cap screws are not tightened

evenly,and in a criss-crossing pattern to

keep pump mounting flange and back plate parallel.

17.install eight socket head cap screws to retain motor to back plate.Tighten evenly in a criss-crossing pattern so that pump mounting flange and back plate remain parallel.Tighten to 10-14N.m (87-123lb-in).

4-37

Spring pin

Dowel pin

Motor valve plate

TYM T303HST, T353HST Workshop Manual

Specifications and Main Features

Frequently Asked Questions

User Manual