2004 Kioti Daedong DK50S, DK55, DK501, DK551 Tractor Workshop Manual (P/N A13-WOO)

• 382-page December 2004 factory workshop manual PDF set for KIOTI (Daedong) DK50S/DK501 and DK55/DK551 tractors, divided into 11 system chapters.
• Engine coverage is matched to the tractor variants: the DK50S/DK501 uses the 4A200TA diesel, while the DK55/DK551 uses the 4A220T. The engine chapter covers removal, internal disassembly, inspection, reassembly, testing, and adjustment.
• Clutch and transmission repair content includes pedal and safety-switch adjustment, tractor separation, clutch inspection, shuttle/main/range/creep shift diagnosis, transmission teardown, synchronizer and differential service, front-wheel-drive/Quick Turn clutch work, and PTO-clutch repair.
• Axle, brake, steering, and hydraulic sections address the rear planetary axle, wet-disc brakes, front axle and bevel gears, hydrostatic steering unit and cylinder, gear pump, hydraulic filter, joystick valve, PTO/4WD control valves, power lift, and MLS control valve.
• Electrical and cab chapters provide system-level diagnosis through wiring diagrams, connector and terminal views, fuse-testing information, starting, charging, glow-plug, PTO, and instrument-panel circuits, R134a air-conditioning service, heater diagnosis, and compressor disassembly.
• Configuration-specific material is separated for ROPS and cabin tractors, USA/Australia systems, and Japan-only horizontal control, rotary level control, Quick Turn, and Quick Turn plus Auto Brake equipment.

File breakdown: General 58 pages; Engine 56; Clutch 16; Transmission 62; Rear Axle 10; Brake 12; Front Axle 26; Steering 24; Hydraulic 48; Cabin 24; Electrical 46.

Model and Configuration Coverage

The publication follows the factory’s two-part format: mechanism sections explain construction and operation, while servicing sections provide troubleshooting, removal, disassembly, inspection, reassembly, adjustment, specifications, and acceptable limits. The specification table identifies the DK50S/DK501 with the 1,999 cc 4A200TA engine and the DK55/DK551 with the 2,197 cc 4A220T engine. Both ROPS and factory-cab machines are represented in the safety, maintenance, separation, HVAC, fuse, and wiring material.

Regional differences matter on these tractors, and the manual does not treat every circuit as universal. USA/Australia coverage includes the applicable PTO and standard 4WD arrangements. Japan-only sections document the electrohydraulic horizontal-control and rotary-level systems, Quick Turn, Quick Turn plus Auto Brake, related safety switches, solenoids, relays, terminal layouts, and fault checks. The hydraulic chapter also covers the auxiliary control valve where equipped.

Powertrain, Chassis, and Hydraulic Repair Depth

Engine repair goes well beyond scheduled maintenance. The manual covers compression and valve-clearance checks, cylinder-head removal, injector heat-seal replacement, rocker-arm service, timing-gear and camshaft work, piston and connecting-rod inspection, crankshaft and main-bearing service, oil-pump checks, cooling-system tests, injection timing, and nozzle testing. Factory dimensions and service limits are supplied for the head, valves, guides, springs, rocker gear, tappets, camshaft, timing gears, cylinder bores, piston rings, connecting rods, crankshaft journals, thermostat, radiator, and fuel components.

The clutch section includes pedal and safety-start switch adjustment, tractor separation, clutch removal and assembly, disc and pressure-plate inspection, release-bearing checks, and the clutch center guide listed in the special-tools section. Transmission coverage follows power flow through the shuttle, main shift, range and creep sections, front-wheel-drive/Quick Turn drive, PTO gearing, and shift linkages. Internal repair work includes case separation, shaft and gear disassembly, synchronizer inspection, PTO clutch service, differential teardown, bevel-gear backlash and tooth-contact adjustment, and final shift checks.

Chassis chapters handle rear-axle planetary service, wet-disc brake adjustment and inspection, front-axle separation, differential and bevel-gear setup, steering-pump and control-unit service, and steering-cylinder repair. The hydraulic section adds pump and filter service, PTO modulating-valve diagnosis, 4WD/Quick Turn valve pressure checks, joystick-valve removal, lift-system teardown, MLS control-valve inspection, and position, draft, and sensitivity adjustments.

Diagrams, Diagnostics, and Factory Data

Useful drawings include the Engine Disassembled View, Power Train Diagram, Transmission Shift Linkage Structure, Hydraulic Oil Flow Schematic, Power Steering Hydraulic Circuit, and the USA instrument-panel circuit and connector view. Electrical coverage extends to the main wiring diagram, ignition circuits with and without the horizontal controller, alternator and charging diagrams, glow-plug controller time chart, USA/Australia PTO circuit, Japan-only rotary-level and Quick Turn circuits, plus air-conditioning and heater schematics.

The General chapter provides the maintenance checklist from daily inspections through 800-hour, annual, and two-year service, followed by service-as-required items. Across the set, technicians get general and component-specific torque tables, approved lubricant and fluid data, pressure-test specifications, electrical test values, clearances, backlash and preload data, wear limits, and adjustment specifications.

The manual also calls out rebuild traps that are easy to miss. Engine timing gears use match marks, the cylinder-head gasket and shim have a defined orientation, and main-bearing components are indexed; incorrect assembly can upset timing or lubrication and damage internal parts. In the transmission, the 4WD/Quick Turn clutch thrust-collar oil groove must face the gear and the differential shim locations must be preserved, or backlash and tooth contact can be lost. The cab chapter requires R134a-only equipment and sealed open lines because contamination or an incorrect charging connection can damage the compressor and create a high-pressure hazard.

Heavy repair work should be performed with the tractor securely supported, implements lowered, stored hydraulic pressure relieved, and the battery isolated. Refrigerant recovery and charging involve high-pressure equipment and are identified in the manual as specialist work.