Komatsu WA800-3 Wheel Loader Shop Manual SEBM013409 – Complete Service, Repair & Troubleshooting Guide PDF

Description

Komatsu WA800-3 Shop Manual – SEBM013409

This is the complete Komatsu WA800-3 Shop Manual, document number SEBM013409, covering the WA800-3 wheel loader from serial number 50001 and up. The manual mounts the SA12V140-1 engine and is organized into six major sections: General, Structure and Function, Testing and Adjusting, Disassembly and Assembly, Maintenance Standard, and Others (including full electric circuit diagrams). Every chapter group is broken down to component level, making this the primary reference for anyone servicing, repairing, or rebuilding the WA800-3.

File Details

• Manual type: Shop Manual (Service & Repair)
• Brand: Komatsu
• Model: WA800-3 Wheel Loader
• Document number: SEBM013409
• Serial number coverage: 50001 and up
• Engine: SA12V140-1 (see 12V140-1 Series Engine Shop Manual for engine details)
• Language: English
• File format: PDF
• Page count: Approximately 1,224 pages

Chapters Covered

The Komatsu WA800-3 Shop Manual follows the manufacturer’s standard six-section layout, with each section further divided into major component groups.

• 01 General – General assembly drawing, machine specifications, weight table, list of lubricants and water
• 10 Structure and Function – Power train system, engine control, servo cylinder, radiator and cooler, damper, torque converter, transmission, transfer, transmission control valve, drive shafts, center support, axle, final drive, center hinge pin, tire and wheel, steering piping, steering pump, switch pump, steering demand valve, brake valve, parking brake, work equipment hydraulics, main piston pump, PPC valve, main control valve, work equipment linkage, cab, air conditioner, electric circuit diagrams, machine monitor system, and more
• 20 Testing and Adjusting – Standard value tables for engine, chassis, and electrical parts; measuring engine speed, exhaust gas color, valve clearance, compression pressure, blow-by pressure, fuel injection timing, oil pressure, exhaust temperature, boost pressure; belt tension adjustments; torque converter and transmission oil pressure testing; steering oil pressure; brake performance testing; PPC pressure; work equipment hydraulic pressure; bleeding procedures; troubleshooting (S, T, M, K, E, H, J, A, WRK modes)
• 30 Disassembly and Assembly – Starting motor, alternator, engine oil cooler, fuel injection pumps, water pump, nozzle holder, turbocharger, engine front/rear seals, cylinder head, radiator, engine, damper, torque converter, transmission, transfer, PTO, center support, drive shaft, front axle, rear axle, differential, final drive, steering, brake valve, slack adjuster, brake, parking brake, hydraulic pump, piston pump, PPC valve, work equipment control valve, cab, floor frame, center hinge pin, work equipment, hydraulic cylinders, air conditioner, fuel tank, counterweight
• 40 Maintenance Standard – Engine mount, transmission mount, damper, torque converter, transmission, transfer, drive shaft, center support, differential, final drive, axle mount, center hinge pin, steering, brake, parking brake, PPC valve, pumps, main control valve, hydraulic cylinder, bucket linkage, bucket positioner
• 90 Others – Full 16-part electric circuit diagram set, including steering wheel and joystick steering specifications and AJSS (Advanced Joystick Steering System) specifications

This manual gives the technician the complete mechanical and hydraulic blueprint of the WA800-3 – from the SA12V140-1 engine mounting and damper through the torque converter and 3-forward/3-reverse planetary transmission, out to the axles and final drives, and across the steering, brake, and work equipment hydraulic circuits. It also contains the electrical circuit diagrams, monitor system diagnostics, and component-level disassembly and assembly procedures that a workshop needs to carry out major repairs correctly.

What You Can Do With This Manual

The WA800-3 is a 98,300 kg wheel loader with an 11.0 m³ bucket and a 19,800 kg rated load. Servicing it correctly requires more than general mechanical knowledge – it requires the exact procedures, tightening torques, pressure settings, and clearances that this manual provides. With this Komatsu WA800-3 Shop Manual you can:

• Diagnose engine, transmission, torque converter, steering, brake, and hydraulic faults using the testing and adjusting procedures and the standard value tables
• Rebuild the SA12V140-1 engine, including cylinder head, valve clearance adjustment, fuel injection timing, and compression testing
• Overhaul the torque converter, transmission, transfer case, differential, and final drives with correct assembly clearances and torque specifications
• Repair the steering demand valve, Orbit-roll valve, PPC valve, main control valve, and hydraulic cylinders
• Service the brake system, slack adjusters, parking brake, and accumulator charge valve
• Trace and troubleshoot electrical faults using the 16-part electric circuit diagram set and the controller failure-code tables
• Set the machine monitor system, maintenance monitor, joystick steering, and AJSS control systems
• Carry out the complete disassembly and assembly of every major component with the correct sequence and special tools

Why This Manual Matters

Using the wrong torque, the wrong pressure setting, or the wrong assembly sequence on a machine of this size can turn a repair into a major failure. This Komatsu WA800-3 Shop Manual gives you the manufacturer’s own specifications: the engine speed ranges, the transmission main relief pressure, the pilot reducing pressure, the modulating pressure, the accumulator charge cut-in and cut-out pressures, the steering relief pressure, and the work equipment relief pressure. It also gives the wear limits and repair standards for every major component, so you can judge whether a part can be reused or must be replaced.

For a workshop that services the WA800-3, this is the reference document that keeps every job – from a routine adjustment to a full powertrain overhaul – within factory specification.

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Instant PDF Delivery

This Komatsu WA800-3 Wheel Loader Shop Manual (SEBM013409) is delivered as an instant PDF download after payment. No shipping, no waiting. You can open it on any device – laptop, tablet, or smartphone – and print the pages you need for the workshop floor. Whether you are diagnosing a fault, ordering parts, or rebuilding a major assembly, the full manual is in your hands immediately.