This document provides maintenance and service information for KIOTI tractors models DK50S/55(DK501/551). It is divided into chapters that cover general information, the engine, clutch, transmission system, rear axle, brake system, front axle, steering system, hydraulic system, cabin systems, electric systems and safety procedures. The document includes specifications, troubleshooting tips, disassembly/assembly instructions, and maintenance schedules for various intervals such as daily, every 50 hours, every 100 hours and yearly. Safety warnings are provided throughout and indicated with signs for danger, warning and caution.

1. CONTENTS
CHAPTER 1 GENERAL.....................................................................................................................1-1
1. TRACTOR INDENTIFICATION ....................................................................................................................... 1-3
2. TRACTOR VIEW ............................................................................................................................................... 1-4
3. GENERTAL PRECATIONS
3.1 ASSEMBLY AND DISASSEMBLY ......................................................................................................... 1-5
3.2 ELECTRICAL SYSTEM ......................................................................................................................... 1-6
3.3 TUBE AND RUBBERS.......................................................................................................................... 1-7
3.4 LUBICANT .............................................................................................................................................. 1-7
4. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING................................................... 1-8
5. SPECIFICATION .............................................................................................................................................. 1-9
6. LUBRICANTS,FUEL AND COOLANT ......................................................................................................... 1-10
7. TIGHTENING TORQUE ................................................................................................................................ 1-11
7.1 GENERAL USE SCREW,BOLTS AND NUTS .................................................................................. 1-11
7.2 STUD BOLTS ....................................................................................................................................... 1-11
7.3 AMERICAN STANDARD SCREW,BOLTS AND NUTS WITH UNC OR UNF THREADS............ 1-12
8. MAINTENANCE CHECK LIST ...................................................................................................................... 1-13
9. CHECK AND MAINTENANCE ...................................................................................................................... 1-15
9.1 DAILY CHECK...................................................................................................................................... 1-15
9.2 EVERY 50 HOURS.............................................................................................................................. 1-19
9.3 EVERY 100 HOURS ........................................................................................................................... 1-21
9.4 EVERY 200 HOURS ........................................................................................................................... 1-26
9.5 EVERY 400 HOURS ........................................................................................................................... 1-31
9.6 EVERY 600 HOURS ........................................................................................................................... 1-32
9.7 EVERY 800 HOURS ........................................................................................................................... 1-32
9.8 EVERY 1 YEAR .................................................................................................................................... 1-32
9.9 EVERY 2 YEARS ................................................................................................................................. 1-33
9.10 SERVICE AS REQUIRED ...................................................................................................................1-35
10.TIRES .............................................................................................................................................................. 1-38
CHAPTER 2 ENGINE ........................................................................................................................2-1
1. FEATURE .......................................................................................................................................................... 2-3
2. LUBRICATING SYSTEM ................................................................................................................................. 2-4
3. COOLING SYSTEM.......................................................................................................................................... 2-5
4. FUEL SYSTEM ................................................................................................................................................. 2-6
5. TROUBLESHOOTING ..................................................................................................................................... 2-7
6. SERVICING SPECIFICATION ...................................................................................................................... 2-10
6.1 ENGINE BODY .................................................................................................................................... 2-10
6.2 LUBRICATING SYSTEM ..................................................................................................................... 2-13
6.3 COOLING SYSTEM ............................................................................................................................. 2-14

2. 6.4 FUEL SYSTEM ..................................................................................................................................... 2-14
6.5 TIGHTENING TORQUE ...................................................................................................................... 2-15
7. DISASSEMBLING AND MAINTENANCE ..................................................................................................... 2-16
7.1 SEAPRATING THE ENGINE .............................................................................................................. 2-16
7.2 ENGINE DISASSEMBLED VIEW ...................................................................................................... 2-25
7.3 ENGINE BODY .................................................................................................................................... 2-27
7.4 LUBRICATING SYSTEM ..................................................................................................................... 2-50
7.5 COOLING SYSTEM ............................................................................................................................. 2-52
7.6 FUEL SYSTEM ..................................................................................................................................... 2-54
CHAPTER 3 CLUTCH .......................................................................................................................3-1
1. FEATURES ........................................................................................................................................................ 3-3
2. TROBLESHOOTING ........................................................................................................................................ 3-4
3. SPECIFICATIONS,TIGHTENING TROQUES AND SPECIAL TOOLS ...................................................... 3-5
3.1 SPECIFICATIONS ................................................................................................................................. 3-5
3.2 TIGHTENING TORQUES ..................................................................................................................... 3-5
3.3 SPECIAL TOOLS................................................................................................................................... 3-5
4. CHECK, DISASSEMBLYING AND MAINTENANCE ..................................................................................... 3-6
4.1 ADJUSTMENT OF PEDAL.................................................................................................................... 3-6
4.2 DISASSEMBLING AND ASSEMBLY OF CLUTCH ............................................................................. 3-7
4.3 INSPECTION AND REPAIR ............................................................................................................... 3-13
CHAPTER 4 TRANSMISSION SYSTEM ........................................................................................4-1
1. STRUCTURE ................................................................................................................................................... 4-3
1.1 POWER TRAIN DIAGRAM .................................................................................................................... 4-3
1.2 POWER TRAIN ...................................................................................................................................... 4-4
1.3 TRANSMISSION SHIFT LINKAGE STRUCTURE ........................................................................... 4-10
2. TROUBLESHOOTING ................................................................................................................................... 4-15
2.1 TROUBLESHOOTING FOR SHUTTLE SHIFT ................................................................................ 4-15
2.2 TROUBLESHOOTING FOR MAIN SHIFTS SECTION IN OPERATION ERROR ........................ 4-15
2.3 TROUBLESHOOTING FOR AUXILIARY AND CREEP SHIFTS IN OPERATION ERROR ......... 4-16
2.4 TROUBLESHOOTING FOR REAR DIFFERENTIAL GEAR IN OPERATION ERROR ............... 4-16
2.5 TROUBLESHOOTING FOR FRONT WHEEL DRIVE IN OPERATION ERROR ......................... 4-17
2.6 TROUBLESHOOTING FOR PTO CLUTCH IN OPERATION ERROR ......................................... 4-17
2.7 TROUBLESHOOTING FOR PTO IN OPERATION ERROR........................................................... 4-17
2.8 TROUBLESHOOTING FOR PARKING BRAKE IN OPERATION ERROR.................................... 4-17
3. SPECIFICATIONS .......................................................................................................................................... 4-18
3.1 TIGHTENING TORQUES ...................................................................................................................4-18
4. DISASSEMBLING AND MAINTENANCE ..................................................................................................... 4-19
4.1 DISASSEMBLING TRANSMISSION.................................................................................................. 4-19
4.2 SERVICING .......................................................................................................................................... 4-54

3. CHAPTER 5 REAR AXLE ..................................................................................................................5-1
1. STRUCTURE ................................................................................................................................................... 5-3
2. TROUBLESHOOTING ..................................................................................................................................... 5-4
3. TIGHTENING TORQUE .................................................................................................................................. 5-5
4. DISASSEMBLING AND MAINTENANCE ....................................................................................................... 5-6
4.1 DISASSEMBLING REAR AXLE ............................................................................................................ 5-6
4.2 MAINTENANCE.................................................................................................................................... 5-10
CHAPTER 6 BRAKE..........................................................................................................................6-1
1. STRUCTURE ................................................................................................................................................... 6-3
2. TROUBLESHOOTING ..................................................................................................................................... 6-5
3. SPECIFICATIONS ............................................................................................................................................ 6-5
4. TIGHTENING TORQUE .................................................................................................................................. 6-6
5. CHECK,DISASSEMBLING AND MAINTENANCE ........................................................................................ 6-7
5.1 ADJUSTMENT OF THE BRAKE .......................................................................................................... 6-7
5.2 DISASSEMBLING AND ASSEMBLY .................................................................................................... 6-8
5.3 SERVICING .......................................................................................................................................... 6-11
CHAPTER 7 FRONT AXLE ...............................................................................................................7-1
1. STRUCTURE ................................................................................................................................................... 7-3
2. TROUBLESHOOTING ..................................................................................................................................... 7-4
3. SPECIFICATIONS ............................................................................................................................................ 7-5
4. TIGHTENING TORQUE .................................................................................................................................. 7-7
5. CHECK,DISASSEMBLING AND MAINTENANCE ........................................................................................ 7-8
5.1 CHECK AND MAINTENANCE ............................................................................................................. 7-8
5.2 SEPARATING FRONT AXLE............................................................................................................... 7-10
5.3 DISASSEMBLING THE FRONT AXLE .............................................................................................. 7-12
5.4 SERVICING .......................................................................................................................................... 7-22
CHAPTER 8 STEERING SYSTEM ..................................................................................................8-1
1. STRUCTURE ................................................................................................................................................... 8-3
1.1 CHARACTERISTICS............................................................................................................................. 8-3
1.2 HYDRAULIC CIRCUIT OF POWER STEERING SYSTEM .............................................................. 8-4
1.3 GEAR PUMP .......................................................................................................................................... 8-5
1.4 POWER STEERING UNIT.................................................................................................................... 8-6
1.5 STEERING CYLINDER ........................................................................................................................ 8-7
1.6 OIL FLOW ............................................................................................................................................... 8-8
2. TROUBELSHOOTING ................................................................................................................................... 8-10
3. SPECIFICATIONS .......................................................................................................................................... 8-11
4. DISASSEMBLING AND MAINTENANCE ..................................................................................................... 8-12

4. 4.1 SEPARATING THE HYDRAULIC PUMP ........................................................................................... 8-12
4.2 SEPARATING THE STEERING UNIT ............................................................................................... 8-14
4.3 DISASSEMBLING OF THE STEERING CYLINDER....................................................................... 8-23
4.4 SERVICING .......................................................................................................................................... 8-24
CHAPTER 9 HYDRAULIC SYSTEM ...............................................................................................9-1
1. STRUCTURE ................................................................................................................................................... 9-3
1.1 HYDRAULIC OIL FLOW SHEMATIC ................................................................................................... 9-3
1.2 HYDRAULIC CIRCUIT SHEMATIC ..................................................................................................... 9-4
1.3 HYDRAULIC FILTER SHEMATIC ........................................................................................................ 9-5
1.4 HYDRAULICPUMP SHEMATIC ........................................................................................................... 9-5
1.5 POWER STEERING SYSTEM ............................................................................................................. 9-6
1.6 PTO CLUTCH VALVE SYSTEM ........................................................................................................... 9-8
1.7 4WD,Q/T AND Q/T (AB) SYSTEM........................................................................................................ 9-9
1.8 JOYSTICK VALVE ................................................................................................................................ 9-10
1.9 HORIZONTAL CONTROL SYSTEM (ONLY JP) .............................................................................. 9-11
1.10 HYDRAULIC POWER LIFT SYSTEM................................................................................................ 9-12
1.11 AUXILIARY CONTROL VALVE (IF EQUIPPED) ............................................................................... 9-13
2. TROUBLINGSHOOTING...............................................................................................................................9-14
2.1 JOYSTICK VALVE ................................................................................................................................ 9-14
2.2 HYDRAULIC LIFT SYSTEM ............................................................................................................... 9-15
3. CHECKING,DISASSEMBLING AND MAINTENANCE ............................................................................... 9-16
3.1 HYDRAULIC FILTER .......................................................................................................................... 9-16
3.2 HYDRAULIC PUMP............................................................................................................................. 9-16
3.3 POWER STEERING UNIT.................................................................................................................. 9-18
3.4 PTO CLUTCH VALVE.......................................................................................................................... 9-19
3.5 4WA,Q/T AND Q/T(AB) VALVE............................................................................................................ 9-23
3.6 JOYSTICK VALV................................................................................................................................... 9-27
3.7 HORIZONTAL CONTROL VALVE ...................................................................................................... 9-28
3.8 HYDRAULIC LIFT SYSTEM ............................................................................................................... 9-30
CHAPTER 10 CABIN SYSTEM ...................................................................................................... 10-1
1. STRUCTURE ................................................................................................................................................. 10-3
1.1 HEATER ................................................................................................................................................ 10-3
1.2 AIR-CONDITIONER ............................................................................................................................ 10-4
2. TROUBLESHOOTING ................................................................................................................................... 10-6
3. INSPECTION AND ADJUSTMENTS ......................................................................................................... 10-14

5. CHAPTER11 ELECTRIC SYSTEM..................................................................................................11-1
1. HOW TO WIRING DIAGRAM ........................................................................................................................ 11-3
1.1 WIRE CODE ......................................................................................................................................... 11-3
1.2 WIRE SIZEW ........................................................................................................................................ 11-3
1.3 INSTRUMENT PANEL BULBS .......................................................................................................... 11-4
1.4 RELAY AND SWITCH.......................................................................................................................... 11-5
1.5 MULTIPLE SWITCH ............................................................................................................................ 11-5
1.6 RELAY BOX .......................................................................................................................................... 11-6
1.7 FUSE CHECK...................................................................................................................................... 11-7
1.8 WIRING DIAGRAM .............................................................................................................................. 11-9
2. INSTRMENT PANEL .................................................................................................................................... 11-11
2.1 SYMBOL DESCRIPTION.................................................................................................................. 11-11
2.2 CIRCUIT DIAGRAM OF INSTRUMENT(USA) ............................................................................... 11-14
3. STSRTING SYSTEM .................................................................................................................................... 11-15
3.1 IGNITION CIRCUIT(WITHOUT THE INSTALLATION OF HORIZONTAL CONTROLLER ....... 11-15
3.2 IGNITION CIRCUIT(HORIZONTAL CONTROL INSTALLATION EXPECTATION ONLY JP ..... 11-16
3.3 MAJOR COMPONENTS ................................................................................................................... 11-17
4. CHARGING SYSTEM................................................................................................................................... 11-22
4.1 CIRCUIT DIAGRAM ........................................................................................................................... 11-22
4.2 AC (ALTERNATING CURRENT)ALTERNATOR ............................................................................ 11-23
5. ENGINE GLOW PLUG SYSTEM ................................................................................................................ 11-25
5.1 CIRCUIT DIAGRAM ........................................................................................................................... 11-25
5.2 MAJOR COMPONENTS ................................................................................................................... 11-26
6. PTO SYSTEM(ONLY USA) .......................................................................................................................... 11-29
6.1 CIRCUIT DIAGRAM ........................................................................................................................... 11-29
6.2 CIRCUIT DESCRIPTION ................................................................................................................. 11-30
6.3 TROUBLESHOOTING ...................................................................................................................... 11-30
7. ROTARY LEVEL CONTROL INSTALLATION(ONLY JP) ......................................................................... 11-31
7.1 SYSTEM COMPOSITION PARTS .................................................................................................... 11-31
7.2 OUTLINE ............................................................................................................................................ 11-32
7.3 LEVEL CONTROL INSTALLATION FUCTION ............................................................................... 11-34
7.4 ELECTRIC CIRCUIT ........................................................................................................................ 11-36
7.5 TERMINAL ARRANGEMENT TABLE ............................................................................................... 11-37
8. QUECK TURN(ONLY JP) ........................................................................................................................... 11-38
8.1 ELECTRIC CIRCUIT ........................................................................................................................ 11-38
8.2 MAIN PARTS COMPOSITION .......................................................................................................... 11-40
8.3 REPAIRS FOR QUECK TURN1 MALFUCTION ............................................................................ 11-42
9. AIR CONDITIONING SYTEM ...................................................................................................................... 11-43
9.1 CIRCUIT DIAGRAM ........................................................................................................................... 11-43
9.2 MAJPR COMPONENTS .................................................................................................................... 11-44
10.HEATER SYSTEM ........................................................................................................................................ 11-46

6. TO THE READER
1
A13-WOO Dec. 2004
TO THE READER
This Workshop Manual has been prepared to provide servicing personnel with information on the mechanism,
service and maintenance of KIOTI (DAEDONG) tractors DK50S/55(DK501/551). It is divided into two parts, “Mecha-
nism” and “Servicing”.
„
„
„
„
„ MECHANISM
Information on the construction and functions are included. The part should be completely understood before
proceeding with troubleshooting, disassembling or servicing.
„
„
„
„
„ SERVICING
In this section you will find general precautions, maintenance and special tools. The are other sections which
include troubleshooting, servicing, specifications lists, disassembling, assembling and servicing that explains in
detail procedures, precautions, factory specifications and acceptable limits.
This manual contains the latest production information on illustrations and specifications based on the most up to
date production information available at the time of publication.
We reserve the right to make changes throughout the entire manual at any time without notice.

7. DK50S/55(DK501/551)
2 A13-WOO Dec. 2004
SAFETY STARTING
1. Always use the safety start switch to start the en-
gine and never by any other means.
2. Do not alter or remove any part of machine safety
system.
3. Before starting the engine, make sure that all shift
levers are in neutral positions or in the disengaged
positions.
4. Never start the engine unless you are in the
operator’s seat.
A13W002A
This symbol, the industry’s “Safety Alert Symbol”, is used throughout this manual and the decals on the machine
itself to warn of the possibility of personal injury. It is essential that you read the instructions and safety regulations
before you attempt to repair or operate this unit. Read these instructions carefully.
SAFETY FIRST
SIGNS
DANGER
WARNING
CAUTION
IMPORTANT
DESCRIPTION
This mark indicates hazardous situation which, if not observed, may
result in death or fatal injury.
This mark should be indicated for most dangerous situations only.
This mark indicates potentially hazardous situation which, if not
observed, may result in death or moderate injury.
This mark indicates potentially hazardous situation which, if not
observed, may result in minor or moderate injury. And this mark can be
used as a warning against unsafe activities.
This mark indicates emphasis on notable characteristics in working
procedures or information on working procedures and technology for
convenient use.
NOTE Gives helpful information.
BEFORE SERVICING AND REPAIRING
1. Read all safety instructions in this manual and be
aware of the safety decals on your machine itself.
2. Thoroughly clean your work area and the machine.
3. Make sure the machine is on firm and level ground
and that the parking brake is set.
4. Lower the implement to the ground.
5. Stop the engine and remove the key.
6. Disconnect the negative battery cable.
7. Place a “DO NOT OPERATE” tag in operator station.
A13W001A

8. TO THE READER
3
A13-WOO Dec. 2004
SAFETY WORKING
1. Do not operate or service the machine while under
the influence of alcohol, medication, or other
substances.
2. Never wear loose fitting clothing and always use
safety equipment appropriate to the job.
3. Never use improvised tools, parts or procedures.
Use only recommended tools appropriate to the
work.
4. Be careful to perform all work safely when servicing
is done by two or more people.
5. Always support the machine by safety stands. Never
work under the machine that is supported solely by
a jack.
6. Do not touch any rotating or hot parts while the en-
gine is running.
7. Never remove the radiator cap while the engine is
running, or immediately after stopping. Only remove
radiator cap when it is cool enough to touch with
bare hands. Slowly loosen the cap to relieve pres-
sure before removing completely.
8. Escaping fluid (fuel or hydraulic oil) under pressure
can penetrate the skin causing serious injury.
Relieve pressure before disconnecting hydraulic or
fuel lines. Tighten all connections before applying
pressure.
A13W003A
A13W004A
AVOID FIRES
1. Never smoke or allow flames or sparks in your work
area, as fuel is extremely flammable and explosive
under certain conditions.
2. Always disconnect the negative battery cable first
and reconnect it last to avoid sparks from an acci-
dental short circuit.
3. Battery gas will ignite. Keep sparks and open flame
away from the top of battery, especially while
charging.
4. Be careful not to spill fuel on the engine.
A13W005A

9. DK50S/55(DK501/551)
4 A13-WOO Dec. 2004
DISPOSE OF FLUIDS PROPERLY
1. Observe relevant environmental protection regula-
tions when disposing of oil, fuel, coolant, electro-
lyte and other harmful waste. Never pour fluids into
the ground, down a drain, or into a stream, pond, or
lake.
A13W008A
VENTILATE WORK AREA
1. Exhaust contains poisonous carbon monoxide, so
you should never run the engine in a closed area. If
the engine must be running while performing
maintenance, make sure the area is well ventilated.
PREVENT ACID BURNS
1. Sulfuric acid in battery electrolyte is poisonous. It is
strong enough to burn skin, clothing and cause
blindness if splashed into eyes. Keep electrolyte
away from eyes, hands and clothing. If you spill elec-
trolyte on yourself, flush with water, and get medi-
cal attention immediately.
A13W006A
A13W007A

10. TO THE READER
5
A13-WOO Dec. 2004
PREPARE FOR EMERGENCIES
1. Be sure to keep a first aid kit and fire extinguisher
handy at all times.
2. Keep emergency numbers for the nearest fire
department, hospital, doctor and ambulance
service, near your telephone in case of emergency.
A13W009A

11. DK50S/55(DK501/551)
6 A13-WOO Dec. 2004
z The following safety decals are installed on the machine.
If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the
parts list.
A13W010A
ROPS
SAFETY DECALS

12. TO THE READER
7
A13-WOO Dec. 2004
(1) Parts No. : T4625-52191 (2) Parts No. : T4837-51181
A13W011A
CABIN

13. DK50S/55(DK501/551)
8 A13-WOO Dec. 2004
(5) Parts No. : T2325-50743
(4) Parts No. : T4818-52142
(6) Parts No. : T4625-52351
(7) Parts No. : T4625-52361
(3) Parts No. : T4685-52311
(8) Parts No. : T4625-53191

14. TO THE READER
9
A13-WOO Dec. 2004
(9) Parts No. : T2241-50702
(11) Parts No. : T4837-51093
(10) Parts No. : T2445-50724
(13) Parts No. : T4818-52132
(12) Parts No. : T2615-54112
(14) Parts No. : T2615-55112

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your reading. Please Click
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16. DK50S/55(DK501/551)
10 A13-WOO Dec. 2004
CARE OF DANGER, WARNING AND CAUTION LABELS
1. Keep danger, warning and caution labels clean and free from obstructing material.
2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.
3. Replace damaged or missing danger, warning and caution labels with new labels.
4. If a component with danger, warning or caution label(s) is replaced, make sure new label(s) is (are) attached
in the same locations(s) as the replaced component.
5. Mount new labels by applying on a clean dry surface and pressing any bubbles to outside edge.
(16) Parts No. : T2615-53561
(15) Parts No. : T4817-52201

17. CHAPTER 1
GENERAL

18. GENERAL
1-3
A13-WOO Dec. 2004
A13W101A
1. TRACTOR IDENTIFICATION
When contacting your local KIOTI (DAEDONG) distributor, always specify engine serial number, tractor serial
number and hour meter reading.
(1) Statutory Plate (2) Identification Plate (3) Engine Serial Number
(4) Hour Meter
A13W103A
A13W102A