TYM T303HST Instruction manual

TYM
WORKSHOP MANUAL
FOR
TRACTORS
(T303HST/T353HST)
#604-9, Namsan-dong, Changwon-city, Kyungnam, Korea ■
■■
■TEL:[phone],FAX:[phone]■
■■
■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-----------------------------------------------------------
UNIVERSALSYMBOLS---------------------------------------------------
SECTION 1. TRACTOR TYPESAND 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.
Manufacturerreserves 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
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. Astream 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.
CAUTION
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
SIGNALWORDS.
Asignal 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
missing
or
damaged
safety
signs
.
RECOGNIZE SAFETY INFORMATION
This symbol, Safety-Alert Symbol, meansATTENTION!YOUR
SAFETY IS INVOLVED.
The message that follows the symbol contains important information
about safety. Carefully read the message
missing
or
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.
STAYCLEAR 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.
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. OnlyAuthorized 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
KEEPRIDERS 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 BATTERYEXPLOSIONS
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.
PREVENTACID 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.
If
you
spill
acid
on
yourself
;
If
you
spill
acid
on
yourself
;
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 VENTILATEDAREA
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 INSTRUCTIONSABOVE CAN CAUSE SERIOUS
INJURYTO THE OPERATOR.
Location: On FENDER LH
Part No.: 1260-904-070-1A
TOAVOID 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
MANUALTHOROUGHLY,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 BATTERYEXPLOSION.
KEEPSPARKS OR OPEN
FRAMES AWAY FROM
BATTERY.
DO NOT JUMP START.
BURNS CAN RESULT FROM
BATTERYACID.
IN CASE OF CONTACT FLUSH
IMMEDIATELYWITH 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
INSTRUCTIONSABOVE 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

UNIVERSALSYMBOLS
Some of the universal symbols have been shown below with an indication of their meaning
Engine speed
rev/minX100) Pressured- open 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
Stop
Neutral
Turn signal
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.
stamped on plate on the L.H.S of Axle bracket
1-15
stamped on plate on the L.H.S of Axle bracket
1.MODELNAME PLATE
The plate indicates the model and type of the tractor.
①Model name
②Production 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 cm3
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”)
R1 Front 7-16, 4PR
Rear 11.2-24, 8PR
R1 Front 8-16, 4PR
Rear 12.4-24, 6PR
R4 Front 27X10, 50-15, 8PR
Rear 12.5-20 R4, 12PR
R3 Front 27X10, 50LL-15, 6PR
Rear 41X14, 00-20- RL
Front
Center pin
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)