Komatsu WA200-5 / WA200PT-5 (2005) Wheel Loader Shop Manual (P/N SEBM033304)

Komatsu’s April 2005 chassis Shop Manual, P/N SEBM033304, covers the WA200-5 and WA200PT-5, serial number 65001 and up.

Text Search, Bookmarks and Circuit Diagram Detail

Search and drawing detail: The body text is searchable, with 325 embedded PDF bookmarks covering the main chapters and many individual procedures. Circuit-diagram labels are not consistently searchable, and small wiring labels require zooming.

Missing pages: Printed pages 10-12 in the HST pump section and 10-151 in the machine-monitoring section are missing. PDF pages 47 and 205 contain duplicates of printed pages 10-138 and 20-151 instead.

Delivered as a ZIP containing one printable, 774-page PDF. This total includes 27 preliminary pages, including five revision-list pages, and the two duplicate pages.

HST, Loader Hydraulics and Chassis Repair

The following selected contents highlight the main repair and diagnostic areas. Other covered jobs include fuel-tank and counterweight removal and installation.

• Engine and cooling: Installed-engine testing and removal and installation of the engine, cylinder head, injection pump, nozzle holders, radiator, aftercooler, and hydraulic oil cooler.

• HST and axles: HST pressure testing and fault diagnosis, pump and motor removal, and step-by-step transfer, axle-housing, and differential disassembly and assembly.

• Steering and brakes: Steering pressure checks and bleeding, brake performance and disc-wear checks, accumulator testing, parking-brake repair, and control-cable adjustment.

• Loader hydraulics: Control-valve and hydraulic-tank removal, hydraulic-cylinder repair, complete work-equipment removal, and bucket-positioner and boom-kick-out adjustment.

• Electrical diagnosis: HST-controller and monitor failure-code tables, connector pin data, T-adapter tables, connector-location drawings, and electrical troubleshooting charts.

• Chassis and cab: Removal and installation procedures for the center hinge pin, operator’s cab, bonded cab glass, air-conditioning unit and compressor, and monitor panel.

Komatsu prepared this shop manual for service personnel, and the depth of the hydraulic testing, electrical fault isolation, heavy-component handling, and special-tool requirements makes it best suited to experienced technicians with a properly equipped repair shop.

Loader Configurations and Hydraulic Systems

The WA200-5 uses single-link work equipment and a 2-spool valve, while the WA200PT-5 uses a parallel-link layout and a 3-spool valve with an auxiliary service circuit. Both mono-lever and optional 2-lever control layouts are shown.

The PT sections identify its attachment PPC valve, quick-coupler valve, coupler plunger, fork positioner, different bucket-cylinder repair setup, and model-only dump-speed control. These distinctions help prevent standard-loader procedures or tooling from being applied to the parallel-tool-carrier arrangement.

Hydraulic structure-and-function coverage explains the 4-gear pump unit, PPC pilot controls, lock and bypass valves, ECSS valve and accumulator, and hydraulic fan drive. Separate cylinder and linkage inspection standards support assessment of worn pins, bushings, rods, and related joints.

HST, Axles and Brake Components

The SAA6D102E-2-A engine drives a variable-displacement HST pump and two bent-axis HST motors through a multiple-shaft planetary compound transfer. The manual follows the charge, servo, relief, cutoff, shuttle, and clutch-solenoid circuits into the transfer, drive shafts, axles, limited-slip differential, and final drives.

Steering coverage explains the orbit-roll valve and optional emergency-steering circuit. Brake sections detail the brake valve, accumulators, slack adjusters, wet-disc brakes, and parking-brake mechanism.

The differential repair section warns that hammering the brake piston into place can damage both the piston and its O-ring; the assembly instructions specify installation with the designated pressing tool.

Engine Testing and Repair Limits

Engine checks cover speed, exhaust smoke, valve clearance, compression, blow-by, injection timing, and oil pressure. Symptom-based troubleshooting addresses starting problems, power loss, smoke, oil consumption, overheating, abnormal noise, and vibration.

This chassis volume includes installed-engine testing and the removal and installation work listed above. Full internal engine overhaul requires the separate 102 Series Engine Shop Manual, which is not included. Cooling-system procedures also cover the cooling fan and fan motor.

Komatsu flags an engine-removal error that can damage the damper: separating the assembly at the HST-pump mounting section can conceal the gear engagement during reassembly.

Monitor Diagnostics and Circuit Drawings

Machine-monitor service mode covers electrical and mechanical fault history, real-time sensor data, maintenance settings, model selection, tire-size and tire-deflection setup, and option selection. The initialize function is factory-only and unavailable for normal service.

Hydraulic and mechanical diagnostic charts address travel, steering, brake, lift-arm, and bucket symptoms, including an inoperative ECSS travel damper. Hydraulic drift and cycle-time checks, operating-force measurements, and a PM Clinic inspection chart provide additional assessment data.

Named graphics include the power train system diagram, HST hydraulic piping diagram, HST controller system diagram, and monitor system circuit diagram. The final section adds separate hydraulic circuit diagrams for each loader model and multi-sheet electrical circuit sets for ROPS-cab and ROPS-canopy machines.

Inspection Data and Workshop Tooling

Standard-value tables distinguish new-machine references from service limits. Component-specific torque data, wear and clearance limits, fluid capacities, and electrical test values support inspection and repair decisions.

Tool tables identify applications and part numbers, including hydraulic tester 799-101-5002, HST-controller T-adapters 799-601-9710 and 799-601-9720, oil-leak tester 799-301-1500, and hydraulic-cylinder repair stand 790-502-1003. Dimensioned sketches support local manufacture of selected transfer, axle, and differential tools.

Before testing or teardown, follow the manual’s precautions for lowering or securely blocking the work equipment, chocking the machine, releasing hydraulic pressure, disconnecting the battery where required, and supporting heavy components with rated lifting equipment.

Valve-Clearance and Speed-Sensor Setting Examples

For the WA200-5, the engine standard-value table lists intake valve clearance of 0.25 mm and exhaust valve clearance of 0.51 mm at normal temperature.

The engine-speed-sensor adjustment specifies a 0.75–1.00 mm gap between the sensor tip and the flywheel ring-gear teeth.