Komatsu WA180-3 Avance Wheel Loader 1998–2008 Shop Manual (P/N SEBM005804, SEBM011900)

• Two Komatsu shop-manual PDFs, 1,155 pages total: P/N SEBM005804 for WA180-3 serial 50001 and up, plus P/N SEBM011900 for WA180-3 EU spec., serial 53001 and up.
• Separates S6D95L-series machine coverage for serial 50001-52999 from the later S6D102E-series configuration, with machine-level engine testing and removal/installation procedures for the engine, fuel injection pump, cylinder head, turbocharger, and cooling components.
• Covers torque converter and transmission removal, internal transmission and clutch-pack overhaul, control/solenoid/accumulator valve service, stall and oil-pressure testing, and power-train troubleshooting.
• Covers axle removal, differential and axle-housing overhaul, final-drive inspection, brake-booster and wet-disc brake repair, brake bleeding, parking-brake adjustment, center-hinge work, and steering-valve/priority-valve service.
• Covers hydraulic/steering pump and main control valve removal, boom and bucket cylinder repair, work-equipment removal and installation, hydraulic pressure testing, bucket-positioner and boom-kick-out adjustment, and post-repair air bleeding.
• Includes hydraulic and electrical schematics, auto-shift controller failure-code diagnosis, transmission cut-off, kick-down and neutralizer circuits, E.C.S.S., air-conditioning circuits, and EU-spec emergency-steering coverage.

Coverage and Manual Scope

This package contains two distinct Komatsu publications. The 608-page main volume carries a May 1998 print date and covers WA180-3 machines from serial 50001 upward. Its specification and troubleshooting sections divide the machine at serial 53001: serial 50001-52999 is listed with the S6D95L-1, while serial 53001 and up is listed with the S6D102E-1-1A.

The 547-page EU-spec volume carries a December 1997 print date and applies specifically to WA180-3 EU-spec machines from serial 53001 upward. Its General section identifies the configuration as WA180-3D with the S6D102E-1 engine. This volume adds the ground-driven emergency steering pump, security and diverter valves, transmission auto-shift controller, and Electrically Controlled Suspension System.

Both manuals provide machine-level engine tests and selected engine-related removal and installation work, but they do not replace a complete internal engine overhaul manual. The covers direct full engine details to the separate Komatsu 95 Series and 102 Series Engine Shop Manuals. Included WA180-3 procedures cover valve-clearance adjustment, compression and injection-timing checks, engine removal, cylinder-head removal and installation, fuel injection pump and nozzle holder work, turbocharger removal and installation, and cooling-system components.

Component and System Overview

The Structure and Function sections trace the power train from the torque converter through the hydraulically actuated transmission, clutch packs, drive shafts, torque-proportioning differential, and planetary final drives. Transmission coverage includes the modulation fill valve, control valve, solenoid valve, accumulator valve, and directional and speed-clutch operation.

Steering and brake chapters explain the steering column, priority and cushion valves, orbit-roll steering valve, brake booster, sealed wet-disc service brakes, and transmission-shaft parking brake. Hydraulic coverage follows the tank, combined hydraulic/steering pump, main control valve, boom and bucket cylinders, work-equipment linkage, bucket positioner, and boom kick-out. Repair chapters provide removal, installation, disassembly, assembly, inspection, and related adjustment coverage for these assemblies.

Circuit-tracing material includes the Transmission Hydraulic System Diagram, Transmission Hydraulic Circuit Diagram, Work Equipment Hydraulic Circuit Diagram, Electrical Wiring Diagram, Air Conditioner Electrical Circuit Diagram, and the EU-spec emergency-steering circuit. Section views and functional drawings support the torque converter, transmission control valve, priority valve, brake booster, main control valve, and related hydraulic assemblies.

Testing, Troubleshooting, and Repair Procedures

Testing and Adjusting covers engine and chassis standard values, stall-speed checks, torque-converter and transmission pressure tests, steering checks, brake performance and disc-wear tests, brake-system bleeding, parking-brake linkage checks, work-equipment hydraulic pressure, valve-spool travel, hydraulic drift, cycle performance, bucket-positioner adjustment, and boom kick-out adjustment.

Troubleshooting is organized by system. The main volume separates engine charts for the two serial ranges and includes power-train, steering, brake, and work-equipment fault isolation. The EU-spec volume adds auto-shift controller diagnostics with a failure-code table and checks for forward/reverse solenoids, high/low and speed solenoids, directional and gear-shift lever signals, travel-speed and engine-speed signals, kick-down, cut-off, neutralizer, buzzer, and controller power circuits.

The tool tables identify factory service equipment such as the 799-203-9000 multi-tachometer kit, 799-101-5002 hydraulic tester, 799-601-7400 T-adapter kit, 793-310-1300 transmission-clutch stand, 793-510-1600 differential mandrel, and 793-605-1001 brake tester. Maintenance Standard sections provide inspection criteria and wear limits for the transmission, control valves, differential, final drives, axle mounts, center hinge, brakes, hydraulic pump, cylinders, linkage, bucket, positioner, and kick-out mechanism.

Specification and Data Highlights

Reference data includes tightening tables for metric fasteners, flared nuts, split-flange bolts, O-ring boss joints, and O-ring boss plugs. The General sections add fluid capacities, lubricant selection by ambient temperature, component weights, and configuration-specific machine and engine specifications. System chapters supply pressure-test specifications, operating-force and travel data, adjustment criteria, clearance data, and disassembled-part inspection standards.

Several cautions are especially useful during major repair work. New transmission clutch piston seals must be formed with the specified shaping fixtures before installation; fitting them unshaped can damage the seal. The steering-valve rotor and drive shaft must retain the indexed relationship shown in the manual because that alignment determines valve timing. During differential and axle repair, shim movement must preserve total shim thickness to avoid changing bearing preload, and the brake piston must be pressed evenly with the specified fixture rather than driven in with a hammer, which can damage the piston and O-rings.

Before working beneath raised equipment, separating the articulated frame, opening hydraulic circuits, servicing brakes, or handling the transmission and axle assemblies, support and isolate the machine as directed in the manual.