Komatsu PC10-7, PC15-3, PC20-7 Excavator1989–1994) Shop Manual (OEM)

Equip your shop with the definitive factory reference. This 262-page official Komatsu shop manual (Publication SEBM020P0703, Rev. 3) maps out the core mechanical, electrical, and hydraulic systems of the 1989–1994 PC10-7, PC15-3, and PC20-7 series.

Comprehensive System Specifications

• Detailed hydraulic circuit diagrams covering three distinct control valve setups.
• Standard judgment values for engine speed, valve clearance, and compression pressure on 3D78N-1B, 3D84N-2K, and 3D84N-2H engines.
• Comprehensive torque tables for bolts, nuts, and split flange hardware.
• Component mapping for swing machinery, travel motors, and monitor panel systems.

Workshop-Ready Technical Data Testing and calibration specs are laid out clearly for routine maintenance, performance checks, or complex troubleshooting. For instance, the manual specifies fuel injection timing at 16±1 degrees B.T.D.C. for the PC10-7, while the PC15-3 and PC20-7 are dialed to 14±1 degrees B.T.D.C.

Hydraulic performance standards define specific relief pressures across the 7-spool and 2-spool control valves. You will find the main relief pressure for the PC10-7 boom and arm circuits documented at 175 kg/cm², and the swing motor safety valve set pressure for the PC15-3/PC20-7 clearly listed at 155 kg/cm².

Note: Heavy equipment maintenance carries inherent safety risks. Always verify factory procedures and adhere to standard shop safety practices before performing high-pressure hydraulic testing or engine calibrations.