Kioti Daedong DK50S/DK55/DK501/DK551 Tractor Workshop Manual (2004)

The December 2004 KIOTI (Daedong) factory workshop manual covers DK50S/DK501 tractors with 4A200TA engines and DK55/DK551 tractors with 4A220T engines. Mechanism sections explain construction and operation; servicing sections provide troubleshooting, maintenance, repair procedures, specifications, and allowable limits.

Searchable Chapter PDFs and Wiring Detail

Text search and circuit detail: All 11 PDFs contain searchable text and embedded section bookmarks. Small wire codes in the main wiring diagram require zooming for comfortable reading.

ZIP download containing 11 printable PDFs, with 382 pages total: General 58; Engine 56; Clutch 16; Transmission 62; Rear Axle 10; Brake 12; Front Axle 26; Steering 24; Hydraulic 48; Cabin 24; Electrical 46. The total includes the contents, foreword and safety pages, 11 chapter dividers, and 16 blank pages.

Engine, Drivetrain and Tractor-System Repair

The following selection of covered work spans the main tractor systems. Other topics include tire ballast and battery storage.

• Engine repair: Removal, internal disassembly, cylinder-head and crankshaft service, component inspection, reassembly, and engine testing and adjustment.

• Clutch and transmission: Tractor separation, travel-clutch inspection, shuttle/main/range/creep diagnosis, synchronizer service, PTO-clutch repair, and 4WD/Quick Turn clutch work.

• Axles and brakes: Rear planetary-axle service, front-axle separation, differential and bevel-gear setup, and wet-disc brake inspection and adjustment.

• Hydrostatic steering: Gear-pump, control-unit and steering-cylinder disassembly, relief-valve adjustment, operating-force checks, and system bleeding.

• Hydraulic controls: Pump and filter service, joystick-valve removal, PTO and 4WD valve diagnosis, power-lift teardown, and MLS control-valve inspection.

• Electrical diagnosis: Wiring diagrams, connector and terminal views, fuse testing, starting and charging circuits, glow-plug controls, PTO interlocks, and instrument-panel information.

• Cab climate systems: R134a air-conditioning diagnosis, leak testing, refrigerant recovery, evacuation and charging, heater troubleshooting, and compressor removal.

Written for servicing personnel, the manual calls for an understanding of system operation before troubleshooting or disassembly.

ROPS, Cab and Regional Configurations

ROPS and factory-cab machines are represented in the safety, maintenance, separation, fuse, and wiring material. USA/Australia PTO circuitry is distinguished from Japan-only horizontal-control, rotary-level-control, Quick Turn, and Quick Turn plus Auto Brake systems.

The regional circuit diagrams, safety-switch information, solenoid checks, relay layouts, and terminal assignments help match fault diagnosis to the installed equipment. The hydraulic chapter also explains the auxiliary control valve where equipped.

Engine Inspection, Cooling and Fuel Service

Step-by-step procedures cover cylinder-head removal, injector heat-seal replacement, rocker-arm service, timing gears, camshafts, pistons, connecting rods, crankshafts, and main bearings. The Engine Disassembled View accompanies the internal repair material.

Compression and valve-clearance checks are supported by dimensions and service limits for the head, valves, guides, springs, rocker gear, tappets, cylinder bores, piston rings, and crankshaft journals.

Oil-pump inspection, radiator and thermostat tests, water-pump service, injection-timing adjustment, and nozzle testing extend the coverage into lubrication, cooling, and fuel delivery.

Assembly notes address timing-gear marks, head-gasket and shim orientation, and indexed main-bearing components—areas where incorrect assembly can affect timing or lubrication and damage internal parts.

Clutch, Transmission and Final-Drive Setup

Clutch procedures include pedal and safety-start switch adjustment, disc and pressure-plate inspection, and release-bearing checks. The dimensioned clutch-center-guide drawing supports workshop tool fabrication.

The Power Train Diagram and Transmission Shift Linkage Structure relate the shafts, gears, and linkages to the shift-diagnosis material. Internal procedures cover case separation, shaft and gear disassembly, differential teardown, bevel-gear backlash and tooth-contact adjustment, and final shift checks.

Transmission assembly notes identify the 4WD/Quick Turn thrust-collar oil-groove orientation and differential-shim locations needed to retain the intended lubrication, backlash, and tooth contact.

Rear planetary-axle inspection includes bearing and thrust-collar wear checks. Front-axle material adds pinion turning-torque and shim adjustments; brake procedures include stop-switch adjustment and disc, plate, and cam-plate inspection.

Steering, Power Lift and Hydraulic Valves

The Hydraulic Oil Flow Schematic and power-steering hydraulic circuit show how the pumps, steering unit, cylinders, and control valves connect.

PTO modulating-valve diagnosis and 4WD/Quick Turn valve pressure checks complement the steering overhaul procedures. Power-lift work includes cylinder inspection, MLS control-valve disassembly, and position, draft, and sensitivity adjustments.

Electrical Tests, Maintenance and Cab Service

The USA instrument-panel circuit and connector view, ignition circuits with and without the horizontal controller, alternator diagrams, and glow-plug controller time chart support circuit tracing. Japan-specific rotary-level and Quick Turn information includes controller terminals and switch, relay, diode, and solenoid checks.

The General chapter supplies daily checks through 800-hour, annual, and two-year maintenance, followed by service-as-required tasks. General and component-specific torque tables, approved lubricant and fluid data, pressure-test specifications, electrical test values, clearances, backlash, preload data, and wear limits support inspection and repair planning.

Cab troubleshooting links heater and air-conditioning schematics with blower, magnetic-clutch, pressure-switch, and manifold-gauge checks. The compressor procedure covers removal from the tractor.

The refrigerant-service precautions address contamination from open lines and incorrect charging connections, which can damage the compressor or create a high-pressure hazard. Heavy repair work requires secure tractor support, lowered implements, hydraulic-pressure relief, and battery isolation; refrigerant charging is reserved for specialists.

A Preview of Engine Checks and Clutch Adjustment Data

For the covered engines, the cold intake and exhaust valve-clearance specification is 0.15 mm. The compression-test section gives a factory range of 3.24–3.73 MPa with the engine warmed up and the starter turning it at 250–350 rpm; the allowable minimum is 2.55 MPa.

Clutch-adjustment data specifies 20–30 mm of pedal free play, alongside a separate safety-start switch clearance specification.