1989-1994 Komatsu PC10-7, PC15-3, PC20-7 Excavator Shop Manual

Technical Scope and Data for 1989–1994 Komatsu PC10-7, PC15-3, PC20-7 Excavators

• Covers 1989–1994 Komatsu PC10-7, PC15-3, and PC20-7 mini excavators, including canopy and cab configurations with steel or rubber track shoe options
• Official Komatsu shop manual, publication number SEBM020P0703, revision 3
• Documents key machine data across 262 pages, including detailed hydraulic circuit diagrams for three distinct control valve setups
• Features comprehensive tables for standard tightening torques of bolts, nuts, and split flange hardware
• Provides judgment standards for engine speed, valve clearance, and compression pressure across 3D78N and 3D84N series engines
• Includes how factory workshop documentation is structured to aid navigation through electrical and hydraulic test procedures
• OCR text layer lets you jump to a torque spec by keyword
• Indexed PDF search covers every chapter and appendix
• This 020P07 edition remains the primary reference document for the 1989–1994 PC10-7, PC15-3, and PC20-7 series builds

Structural and Functional Documentation

The 1989–1994 Komatsu PC10-7, PC15-3, PC20-7 shop manual details the core systems of these mini excavators. It covers the mechanical design of the swing circle, swing machinery, and travel motors. The text maps the hydraulic system including piping, control valves, and cylinders. Electrical circuit diagrams for the engine stop motor and monitor panel systems are also provided.

Testing procedures for the 1989–1994 Komatsu PC10-7, PC15-3, PC20-7 are extensive. Standard judgment values for the 3D78N-1B, 3D84N-2K, and 3D84N-2H engines are documented for engine speed and valve clearance. The fuel injection timing for the PC10-7 is set at 16±1 degrees B.T.D.C., while the PC15-3 and PC20-7 are specified at 14±1 degrees B.T.D.C.

Specification Highlights

Hydraulic system performance is defined by specific relief pressures and flow rates across the 7-spool and 2-spool control valves. The main relief pressure for the PC10-7 boom and arm circuits is documented at 175 kg/cm². The swing motor safety valve set pressure for the PC15-3 and PC20-7 is 155 kg/cm². Reference only — always consult a certified technician before performing service on this equipment.

An official 262-page Komatsu OEM shop manual covering the 1989–1994 PC10-7, PC15-3, and PC20-7, documenting engine, hydraulic, electrical, and chassis specifications for the 020P07-series excavator build.