Komatsu WA350-1 Wheel Loader Shop Manual, 1990–2000 (P/N SEBM04230107)

Komatsu Shop Manual P/N SEBM04230107 covers WA350-1 wheel loaders, serial number 10001 and up, with chassis repair, testing and adjustment procedures.

PDF Text Search and Enlarged Wiring Sheets

Search, bookmarks and diagram detail: The PDF is partially searchable through an OCR text layer, with embedded bookmarks for chapters and individual procedures. Several wiring sheets have no searchable text. Small wiring labels require zooming, and the earlier circuit sheets have light print.

One printable 781-page PDF in English, including the original cover, contents page, four revision-list pages, eight enlarged wiring-diagram panels, three blank pages and one manual-revision form.

Loader Repair and EVMS Troubleshooting

The selected topics below outline the workshop coverage. Other documented work includes fan-belt adjustment and counterweight removal and installation.

• Engine testing and service: Valve-clearance and injection-timing adjustment, compression and oil-pressure testing, plus removal and installation of the engine and related assemblies.

• Power-train repair: Step-by-step torque-converter, TORQFLOW transmission and transfer disassembly and assembly, differential and planetary final-drive repair, plus stall-speed and transmission-pressure diagnosis.

• Steering and articulation: Steering-linkage testing and adjustment, steering gear, valve and cylinder repair, and center-hinge-pin removal and installation.

• Brakes and air system: Air-system testing, brake bleeding, brake and parking-brake performance checks, and overhaul of the brake valve, chamber, slack adjuster, wet-disc brake and spring cylinder.

• Work hydraulics: Pump and main-control-valve service, pressure and drift tests, lift/dump cylinder overhaul, work-equipment removal, and bucket-positioner and boom-kick-out adjustment.

• Electrical diagnosis: Serial-specific wiring diagrams, connector-terminal views and YES/NO charts for starting, stopping, preheating, transmission control, parking-brake control and Electronic Vehicle Monitoring System (EVMS) faults.

Prepared for service-workshop operations, this manual is suited to trained service technicians and experienced heavy-equipment mechanics with hydraulic test equipment and facilities for handling heavy assemblies.

Engine Service and Overhaul Boundary

Engine coverage includes S6D110-1 mounting and chassis integration. Component removal and installation extends to the fuel-injection pump, water pump, cylinder head, turbocharger, radiator, oil cooler and fuel tank.

Internal engine work: This chassis publication does not provide a complete internal engine overhaul. The cover directs engine detail to the separate 110 Series Engine Shop Manual, which is not included.

Serial Breaks and Hydraulic Configurations

Steering and frame: Steering-linkage layouts change at serial 10187, and center-hinge pin mounting-bolt specifications change at 10515. The 11118 break affects axle mounts, center-hinge details, transmission-control-valve and electrical layouts, bucket linkage and standard-value tables.

Pump and valve options: Power-train and steering hydraulic circuit diagrams accompany separate 2-spool and optional 3-spool work-equipment schematics, including the attachment circuit. The SAR(3)-080 hydraulic pump is paired with an SAR(3)-050 steering pump on earlier machines and an SAR(3)-040 from serial 11118.

Optional emergency steering coverage includes the pump, diverter valve and security valve. Parking-brake troubleshooting identifies machines equipped with air parking brakes.

Power-Train Assembly Details

Power-train procedures also cover removal of the complete converter/transmission/transfer assembly, transmission-control-valve service, drive-shaft disassembly and assembly, and differential bearing-preload, backlash and tooth-contact adjustment.

EVMS Charts and Monitor Service

The E-1–E-15 electrical charts and M-1–M-33 monitor charts pair voltage, continuity and resistance checks with connector locations and terminal views. These references let technicians distinguish wiring and sensor faults from monitor-module faults when investigating warning displays and gauge problems.

Monitor service includes speedometer-module adjustment after tire or module changes and machine-monitor removal and installation.

Cab and Air-Conditioning Service

Daikin air-conditioning coverage includes piping and electrical circuit diagrams, along with removal and installation of the cab, air-conditioner unit, condenser, dry receiver and compressor.

Shop Tools and Assembly Cautions

Tools and reference data: Factory tables identify the 799-203-8000 tachometer, 799-101-5000 hydraulic tester, 795-502-1204 compression gauge and 790-303-1001 SA-pump flow-meter kit.

Reference tables cover component weights, oil and coolant capacities, wire codes, standard bolt, nut, flare-nut and split-flange torques, operating test data, wear limits, fits, clearances and pump repair limits.

Assembly cautions: The SA gear-pump chapter addresses dowel-pin-bore and contact-surface damage from prying or striking parts, plus damage to reused oil seals at the drive-gear splines. Center-hinge notes cover spacer orientation and protection of the dust-seal lip.

Work on the articulated frame, raised work equipment, pressurized hydraulic or air circuits, brakes, spring-loaded components and heavy assemblies requires the frame safety bar or appropriate locks, secure blocking and lifting equipment described in the manual.

Air-System and Differential Specification Examples

With coolant within its operating range, the air-system test section specifies governor cut-in pressure of 7.0 ± 0.3 kg/cm² and cut-off pressure of 8.3 ± 0.3 kg/cm².

Differential assembly data specify 0.25–0.33 mm backlash between the bevel gear and pinion, alongside illustrated tooth-contact patterns.