2002 Komatsu PC50UU-2 Excavator Shop Manual

• Covers the 2002 Komatsu PC50UU-2 mini excavator (serial numbers 8001 through 14993 and up), including both canopy and cab configurations.
• Official publication S/N SEBM000906, edition March 2002.
• Contains 12 detailed hydraulic piping diagrams and 18 exploded-view assembly schematics for the main pump, control valves, and travel motors.
• Spans 828 pages, serving as the definitive reference for the 4D84-2GA and 4D88E-series engine variants.

Component Structures and Systems

This shop manual breaks down the structural architecture and operational functions of primary machine systems. Core chapters outline the power train, evaluating main pump configurations for different serial ranges and PTO specifications. The documentation segments the hydraulic network effectively. It details the 5-spool and 6-spool control valves, center swivel joints, and tank maintenance protocols. Extensive schematics illustrate the swing machinery, swing circle, and track frame assemblies. This level of detail helps technicians understand the mechanical integration for both rubber and steel shoe setups during major shop-floor overhauls.

Technical Data and Specifications

Having precise figures on hand is crucial for avoiding guesswork. The technical sections deliver critical reference values for testing and adjustments. You will find standard tightening torque specifications for bolts, flared nuts, and split flange connections. Hydraulic data covers relief pressures for the main valves alongside suction cracking pressures for the tank system. Key machine specifications include a 9.1-liter engine oil pan capacity, a maximum digging depth of 4,000 mm, and a swing motor safety valve pressure rated at 20.6 MPa (210 kg/cm2). Please note that working on high-pressure hydraulics carries inherent risks; ensure all machine systems are fully depressurized and standard workshop safety procedures are followed before verifying these reference values.