Komatsu D31A-17, D31E-17, D31P-17, D31PL-17, D31PLL-17, D31P-17A, D31P-17B 1986–2005 Shop Manual (P/N SEBM0114C04)

• Covers 1986–2005 Komatsu D31-17 bulldozers (including D31A-17, D31E-17, D31P-17, D31PL-17, D31PLL-17, D31P-17A, and D31P-17B) equipped with 4D105-5 engines and Hydroshift transmissions
• Official factory documentation for S/N 32001 and up (Reference code SEBM0114C04)
• Features 404 pages of technical data, exploded-view mechanical drawings, and hydraulic system schematics delivered as a searchable PDF
• Standard torque tables list specifications for bolt thread diameters ranging from 6 mm to 39 mm
• Delivers primary build and assembly data, outlining precise specifications for engine-to-transmission coupling and undercarriage system maintenance
• Provides detailed disassembly and assembly procedures for the starting motor, alternator, fuel injection pump, engine oil cooler, water pump, radiator, nozzle holder, and cylinder head
• Contains essential reference materials including wiring diagrams, troubleshooting charts, electric wire code tables, component weight tables, fluid capacity charts, hoisting load capacity tables, standard tightening torque charts, and coating material tables

Component Structure and System Function

When a machine hits the bay, you need to know exactly how its major sub-systems interact. This manual breaks down the core assemblies of the D31-17 series, getting straight into the engine, power train, undercarriage, hydraulics, work equipment, and electrical circuits. The engine section maps out the radiator layout, cooling systems, fuel injection components, and PTO arrangements. On the drive side, it dives into the Hydroshift transmission. You will find clear diagrams covering clutch group functions for forward, neutral, and reverse travel. It also details how the steering clutches integrate with the bevel gear. For shop technicians, this provides a clear roadmap for identifying part assemblies and diagnosing operational issues before starting a complex teardown.

Specification Previews and Calibration Data

Accurate factory numbers ensure precision during testing and adjustments. This reference defines the exact baselines needed to verify system health. For instance, the 4D105-5 engine requires a minimum compression pressure of 32 kg/cm² at 270–350 rpm. Valve clearances are strictly set at 0.25 mm for intake and 0.45 mm for exhaust on models from S/N 150000 upward. General maintenance parameters are clearly listed, like the 17.5-liter transmission case oil requirement. You also get specific inching system and steering control valve pressures, as well as blow-by testing standards, to speed up diagnostic checks during calibration. Providing complete procedures for major tear-downs—such as full engine dismounting, fuel injection pump replacement, and cylinder head rebuilds—enables mechanics to perform these labor-intensive tasks in-house, significantly reducing outside dealership costs. Keep in mind that heavy equipment maintenance involves high-pressure hydraulics and massive physical loads. Always rely on the complete OEM documentation and adhere strictly to workshop safety standards prior to initiating any hands-on adjustments or mechanical repairs.