Covering the DK50S, DK55, DK501, and DK551 tractors, this 382-page OEM manual (A13-WOO) details every system from the engine to the electrical harness. You will find hydraulic schematics with complete circuit routing and full wiring diagrams, including a dedicated guide on reading them. The manual features troubleshooting procedures for the engine, clutch, transmission, brakes, steering, and hydraulics. It also includes torque tables for general fasteners, stud bolts, and UNC/UNF threads. The maintenance schedule outlines daily checks through every-2-year service intervals, removing the guesswork from routine upkeep. Torque the rear wheel attaching nuts to 260.0–304.1 N·m and set clutch pedal free play to 20–30 mm before reassembly. Because downtime costs money, having the factory numbers on the first try is critical. This bookmarked, searchable PDF opens on any device and drops you straight into the section you need.
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 | 11.76 MPa / 120 kgf/cm² / 1706.79 psi | 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 | Every 200 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
Kioti DK55 clutch slips under load after extended field work, tractor loses drive p. 119
Check clutch pedal free play; it should measure 20-30 mm (0.79-1.18 in.) per the spec on page 119. If free play is correct but slip persists, remove the clutch cover and measure disc-to-rivet depth. Replace the disc if rivet depth falls below the 0.3 mm (0.012 in.) allowable limit. Torque clutch cover bolts to 23.5-27.4 N·m on reassembly.
Manual Section: Clutch TroubleshootingHydraulic three-point hitch won't lift implements or raises slowly under full load p. 29
Verify transmission oil level and condition first; low or dirty fluid is the most common cause. Replace the transmission oil filter at the 200-hour service interval on page 29. Inspect fittings for air intrusion. A healthy main pump delivers 37.4 L/min (9.88 gpm) at rated speed; output well below that points to internal pump wear or bypass.
Manual Section: Hydraulic System TroubleshootingEngine cranks but won't fire or turns over too slowly in cold weather
Inspect the air cleaner element; clean with compressed air below 686 kPa (99 psi) and replace yearly or after six cleanings per page 38. Check glow relay operation and measure each glow plug resistance; a failed plug reads open circuit or shorts near zero ohms. Follow the no-start diagnostic to rule out fuel delivery faults.
Manual Section: Engine TroubleshootingTractor pulls hard to one side when stopping, uneven brake pedal resistance p. 207
Adjust each brake pedal independently until free play equals 25-40 mm (0.984-1.574 in.) per the spec on page 207; unequal adjustment is usually the first culprit. If adjustment doesn't fix the pull, remove the brake cover and measure disc thickness. Discard any disc worn below 4.0 mm (0.157 in.). Torque the brake shaft to 367.8-431.6 N·m on reassembly per page 208.
Manual Section: Brake TroubleshootingPTO shaft won't engage at all or drops out unexpectedly under implement load p. 192
Check the PTO switch and power supply first; most non-engage faults are electrical before they're mechanical. If power reaches the solenoid but the clutch won't grab, disassemble the PTO clutch and measure seal ring thickness. Replace any ring worn below 2.5 mm (0.098 in.) allowable limit per page 192. Inspect clutch plates for glazing or oil contamination.
Manual Section: Electric System Troubleshooting (PTO System)Frequently Asked Questions
How do I reset the hydraulic pressure on a Kioti DK55?
To adjust the hydraulic pressure, specifically for the steering relief valve, you need to adjust the relief adjusting plug (29). The variable amount of pressure per revolution of this plug is 15 kgf/cm2 (213 psi). This adjustment should be performed after the assembly is completed.
What are the torque specs for the Kioti DK50S/DK55 front axle or wheel bolts?
For the Kioti DK50S/DK55, the wheel bolt torque specifications are: for nut (1), 17 ~ 19 kgf·m (167~186 N·m, 123~137 lbf·ft); for bolt, 20 ~ 23 kgf·m (196 ~ 225 N·m, 145 ~ 166 lbf·ft); and for nut (2), 28 ~ 32.5 kgf·m (275 ~ 319 N·m, 203 ~ 235 lbf·ft). Specifically for the front wheel attaching nut, the torque is 17.0 ~ 19.0 kgf·m (166.6 ~ 186.2 N·m, 123.0 ~ 137.5 lbf·ft).
Why is my Kioti DK55 showing an error code or warning light?
Your Kioti DK55 may show a warning light for several reasons. A yellow hydraulic system warning lamp indicates that hydraulic pressure has dropped below a specified value due to high oil temperature (approx. 60 5°C) or a blocked oil filter. A red engine oil lamp signifies excessive oil consumption or pressure drops, specifically below 0.5 0.1kg/Cm². A red charge lamp indicates problems in the battery charging system.
What does the DK55 hydraulic problem/pressure adjustment procedure look like?
For hydraulic pressure adjustment, specifically for the steering relief valve, you need to adjust the relief adjusting plug (29). The pressure changes by 15 kgf/cm2 (213 psi) per revolution of this plug. If you encounter hydraulic problems like inability to build pressure, troubleshooting suggests checking if the main pressure relief valve is blocked open, and if so, removing and cleaning or replacing it.
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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