Komatsu WA350-1 Wheel Loader Shop Manual (P/N SEBM04230107)

• This 781-page PDF is Komatsu Shop Manual SEBM04230107 for WA350-1 wheel loaders, serial number 10001 and up. Serial-specific drawings and specifications include breaks at 10187, 10515, and 11118.
• Engine-side coverage includes S6D110-1 engine mounting and chassis integration, valve-clearance and injection-timing adjustment, compression and oil-pressure testing, and removal and installation of the fuel-injection pump, water pump, cylinder head, turbocharger, radiator, oil cooler, complete engine, and fuel tank.
• Power-train repair procedures cover removal of the torque converter/transmission/transfer assembly; internal disassembly and assembly of the torque converter, TORQFLOW transmission, transfer, control valve, differentials, drive shaft, and planetary final drives; plus stall-speed and transmission-pressure diagnosis.
• Steering and brake chapters document steering-linkage testing and adjustment, steering gear/valve/cylinder repair, center-hinge-pin removal and installation, 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-equipment content distinguishes 2-spool and optional 3-spool hydraulic circuits, with pump and main-control-valve service, hydraulic pressure and drift testing, lift/dump cylinder overhaul, work-equipment removal, and bucket-positioner and boom-kick-out adjustment.
• Serial-specific electrical diagrams, connector-terminal views, and YES/NO diagnostic flowcharts support starting, stopping, preheating, transmission control, parking-brake control, and Electronic Vehicle Monitoring System (EVMS) faults. Speedometer-module adjustment and machine-monitor removal and installation are also included.

Workshop Scope and Engine Boundary

Komatsu describes this publication as technical information for service-workshop operations. Its overhaul detail, heavy-component handling requirements, and reliance on hydraulic test equipment make it best suited to trained service technicians and experienced heavy-equipment mechanics with the proper shop facilities.

The engine material does not provide a complete internal S6D110-1 overhaul. It covers the loader installation, testing and adjustment work, and removal or installation of the listed engine assemblies; the cover directs full engine detail to the separate 110 Series Engine Shop Manual. That distinction is important when selecting documentation for an in-frame repair or complete engine rebuild.

Serial and Equipment Variations

The manual separates early and later steering-linkage layouts at serial 10187 and shows a center-hinge mounting-bolt specification change at serial 10515. The larger change at serial 11118 affects axle-mount and center-hinge views, transmission-control-valve and electrical layouts, bucket linkage, and standard-value tables. It also identifies the SAR(3)-080 hydraulic pump with an SAR(3)-050 steering pump on earlier machines and an SAR(3)-040 steering pump from serial 11118.

Optional-equipment coverage includes a 3-spool work-equipment valve and attachment circuit, emergency steering pump with diverter and security valves, air parking-brake troubleshooting, and a Daikin cab air conditioner. Cab, air-conditioner unit, condenser, dry receiver, and compressor removal and installation are covered.

Diagrams, Diagnostics, and Shop Data

Useful visual references include the power-train hydraulic circuit, steering hydraulic circuit, 2-spool and 3-spool work-equipment schematics, serial-specific machine wiring diagrams, the air-conditioner wiring diagram, and EVMS connector and fault-flow views. The electrical section contains E-1 through E-15 charts for starting, parking-brake, transmission, and preheat faults, plus M-1 through M-33 charts for monitor displays, warning devices, gauges, and sensors.

Factory tool 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 sections provide 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.

The SA gear-pump chapter warns against prying the cover or striking internal parts because the dowel-pin bore and contact or sliding surfaces can be damaged; it also calls for protecting the drive-gear spline when the oil seal is reused. Center-hinge assembly notes identify the required spacer orientation and protection of the dust-seal lip.

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