This is the factory Kioti workshop manual for the DK50S, DK55, DK501 and DK551 utility tractors, publication A13-WOO. It spans 382 pages and covers the 50 and 55 horsepower models, including cab equipped versions.Coverage runs across the general specifications, engine, clutch, transmission, rear and front axles, brakes, steering, the hydraulic system, the cabin heater and air conditioner, and the full electrical system, with wiring diagrams, tightening torques and troubleshooting tables.Independent mechanics and owners use it to rebuild the clutch, service the shuttle transmission, diagnose weak hydraulics, adjust the power steering relief pressure and repair the cab climate system. Every procedure comes with the factory clearances, torque values and exploded views needed to complete the job.
What's Inside This Kioti DK50–DK551 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-56 | Safety Instructions, Specifications, Tightening Torques, Special Tools, Periodic Maintenance Schedule, Lubrication and Service |
| Engine | 57-112 | Engine Structure, Disassembly and Reassembly, Cylinder Head and Valves, Pistons and Connecting Rods, Crankshaft and Main Bearings, Cooling System, Fuel System, Check and Adjustment |
| Clutch System | 113-129 | Clutch Structure, Disassembly and Reassembly, Clutch Disc and Pressure Plate, Check and Adjustment |
| Transmission System | 130-192 | Transmission Structure, Main Gearshift, Sub Gearshift, Shuttle Transmission, Disassembly and Reassembly, Check and Adjustment |
| Rear Axle | 193-203 | Rear Axle Structure, Differential, Rear Axle Shaft, Disassembly and Reassembly |
| Brake System | 204-215 | Brake Structure, Disassembly and Reassembly, Brake Adjustment, Parking Brake |
| Front Axle | 216-240 | Front Axle Structure, Disassembly, Knuckle and King Pin, Front Differential, Check and Adjustment |
| Steering System | 241-264 | Steering Structure, Steering Gear Disassembly, Power Steering Unit, Steering Cylinder, Check and Adjustment |
| Hydraulic System | 265-312 | Hydraulic Oil Flow Schematic, Hydraulic Circuit, Hydraulic Filter, Hydraulic Pump, Power Steering, Steering Cylinder, PTO Clutch Valve, 4WD Quick-Turn System, Hydraulic Lift System, Control Valve Disassembly, Lift Cylinder, 3-Point Hitch, Check and Adjustment |
| Cabin System | 313-335 | Heater Structure, Air-Conditioner Structure, Troubleshooting, Trouble Diagnosis, Manifold Gauge Diagnosis, Disassembly and Assembly |
| Electrical System | 336-382 | Wiring Diagram, Instrument Panel, Fuse Box, Relay Box, Starting System, Ignition Circuit, Starter Motor, PTO Circuit, Component Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Power steering unit relief pressure | 120 kgf/cm2 / 11.8 MPa | p. 251 |
| 4WD/QT(AB) valve operation pressure | 166.7 ~ 186.3 N·m / 17 ~ 19 kgf·m / 123.0 ~ 137.4 lbf·ft | p. 287 |
| Rear wheel attaching nut torque | 260.0 ~ 304.1 N·m / 26.5 ~ 31.0 kgf·m / 191.7 ~ 224.2 lbf·ft | p. 197 |
| Front wheel attaching nut torque | 166.6 ~ 186.2 N·m / 17.0 ~ 19.0 kgf·m / 123.0 ~ 137.5 lbf·ft | p. 221 |
| Clutch pedal free play | 20 ~ 30 mm / 0.79 ~ 1.18 in. | p. 119 |
| Clutch disc surface to rivet depth (Allowable Limit) | 0.3 mm / 0.012 in. | p. 119 |
| Transmission oil filter replacement interval | 100 hours | p. 29 |
| Hydraulic pump capacity (1st gear) | 14.53 cc/rev | p. 251 |
| Hydraulic pump capacity (2nd gear) | 6.61 cc/rev | p. 251 |
| Brake pedal free play | 25 ~ 40 mm / 0.984 ~ 1.574 in. | p. 207 |
| Brake disc thickness (Allowable Limit) | 4.0 mm / 0.1574 in. | p. 207 |
| PTO clutch seal ring thickness (Allowable limit) | 2.5 mm / 0.098 in. | p. 192 |
Kioti DK50–DK551 Series Common Problems This Manual Covers
Loss of drive or gear engagement
When the tractor will not move under load or grinds going into gear, the cause is often clutch wear, a shift linkage problem or internal transmission damage. The transmission chapter covers the shuttle transmission and gearshift service.
Manual Section: Transmission System p. 130Weak or erratic hydraulic lift
Slow implements or a hitch that drifts point to a worn pump, low fluid or clogged filtration. The hydraulic chapter details the pump, control valve, lift cylinder and filter, with the power steering relief pressure.
Manual Section: Hydraulic System p. 265Uneven or failing brakes
Brakes that pull to one side or feel spongy usually need adjustment or worn discs replaced. The brake chapter gives the pedal free play spec, disc thickness limit and parking brake service.
Manual Section: Brake System p. 204Hard starting or overheating
Hard starting, rough running or overheating trace to fuel delivery, air intake or cooling faults. The engine chapter carries the fuel system, cooling system and valve clearance procedures.
Manual Section: Engine p. 57Heavy or wandering steering
Steering that feels heavy or wanders often means low hydraulic oil, a worn steering unit or a front end out of alignment. The steering chapter covers the power steering unit and cylinder.
Manual Section: Steering System p. 241Clutch slipping or dragging
A slipping or dragging clutch usually comes from incorrect pedal free play or a worn disc. The clutch chapter provides the free play setting, disc wear limit and cover bolt torques.
Manual Section: Clutch System p. 113Frequently Asked Questions
Which models does this manual cover?
It covers the Kioti DK50S, DK55, DK501 and DK551 tractors, including the 50 and 55 horsepower engines and cab equipped versions.
Does it list torque specs such as head and wheel bolts?
Yes. The engine chapter gives the cylinder head screw torque, and the axle chapters list the front and rear wheel nut torques for these models. p. 57
How do I check or adjust the hydraulic pressure?
The hydraulic chapter covers the system pressures, including the power steering unit relief pressure of 11.76 MPa, along with pump and control valve service. p. 265
Does it cover the cab heater and air conditioner?
Yes. The cabin chapter documents the heater and air conditioner structure, trouble diagnosis and manifold gauge testing for cab equipped models. p. 313
What do I get after purchasing this Kioti DK50–DK551 Series manual?
This is a 382-page searchable PDF ready for immediate download. Works on any device — pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Are there wiring harness diagrams in this Kioti DK50–DK551 Series manual?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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