Komatsu WB97R-2 Backhoe Loader 2001–2007 Shop Manual (P/N WEBM001000)

• Exact coverage: Komatsu WB97R-2 backhoe loaders, serial number 97F20001 and up, with S4D106-1FA engine data. This is Komatsu America Corp. publication WEBM001000, printed in July 2007 and supplied as a 434-page PDF.
• Serial-specific repair procedures: Separate instructions at serial break 97F20172 cover the radiator/oil-cooler package, hydraulic and transmission coolers, engine hood, cab and HVAC group, fuel and hydraulic tanks, engine-gearbox-pump assembly, loader lift and tilt cylinders, and front working equipment.
• Hydraulic diagnosis and adjustment: Covers the piston pump, CLSS load-sensing system, LS and PC valves, working-mode control, LIFD, priority and pressure cut-off valves, steering, brake pump, and 2-/3-/6-/7-/8-spool control-valve configurations. Factory procedures include pressure testing, pump-delivery testing, bleeding, hydraulic-drift isolation, and Return-to-Dig sensor adjustment.
• Transmission and axle work: Documents the torque converter and four-forward/four-reverse transmission, clutch and powertrain pressure tests, transmission removal, front-axle overhaul, rear-axle and final-drive overhaul, differential-lock service, service and parking brake components, and ring-and-pinion depth, backlash, contact-pattern, and bearing-preload setup.
• Loader, backhoe, and cylinder repair: Provides removal, installation, disassembly, and assembly coverage for the loader and backhoe equipment, boom, arm, bucket, outriggers, swing bracket, backframe, standard and side-dig cylinders, jig arm, second arm, and boom safety and backframe-lock cylinders.
• Schematics and service data: Includes the Hydraulic Converter-Transmission Circuit Diagram, hydraulic steering and attachment circuits, CLSS/LIFD operating diagrams, multi-spool valve section views, front/rear axle exploded and sectional views, and a seven-sheet electrical diagram. Torque tables, capacities, wear limits, clearances, pressure-test specifications, and electrical reference data are included for the covered assemblies.

Shop testing and setup depth

Komatsu organized this shop manual around structure and function, testing and adjustment, disassembly and assembly, and maintenance standards. The material is suited to professional technicians and experienced mechanics who have hydraulic test gauges, safe lifting equipment, and the ability to set up axles and cylinders; it is not written as a first-time repair primer.

The testing section goes beyond basic maintenance. Engine procedures address speed, valve clearance, compression, injection timing, belts, and accelerator travel. Machine checks cover brake-pedal alignment and microswitches, attachment and steering pressures, brake operation, converter and clutch pressures, and air-conditioning fault diagnosis. The steering chapter identifies the LAGCSDS160P unit and pairs its circuit description with pressure testing and adjustment. Standard and TBG-version loaded-speed criteria are separated where applicable. Hydraulic drift checks help distinguish leakage at a cylinder from leakage through a control valve before repair work begins.

Axle, powertrain, and cylinder procedures

Removal and installation chapters cover the complete engine-gearbox-pump group, piston pump, transmission, converter, steering unit, brake pump, and cooling package. Separate procedures address the cab, tanks, control valves, and both working-equipment groups. Axle chapters continue into internal repair rather than stopping at unit replacement, with differentials, planetary final drives, swivel housings, universal joints, brake packs, and differential lock. Pinion shimming, tooth contact, and final setup are documented as well. Cylinder coverage includes dedicated seal and bushing work, with special-tool lists for notched wrenches, plungers, expanders, seal installers, gauge blocks, and work on the ATR200620 cylinder fixture.

The axle procedures warn that taking pinion-bearing preload beyond its limit invalidates the spacer setup; simply backing off the adjustment can leave the assembly incorrectly loaded. Cylinder repair notes also call out seal orientation and limited piston safety-staking locations, since incorrect assembly can damage seals or compromise piston retention.

Engine scope and safety

The engine material covers performance checks plus removal and installation of the starter, alternator, injection pump and nozzles, thermostat, coolant pump, turbocharger, and cylinder head. It does not contain a full internal S4D106-1FA short-block overhaul chapter for pistons, connecting rods, or crankshaft work.

Before teardown, lower or securely support the loader and backhoe equipment, release residual hydraulic pressure, isolate the battery, and use rated lifting equipment for heavy assemblies. Air-conditioning work requires proper R134a recovery and service equipment.