1995–1996 Komatsu PC300HD-6 & PC300LC-6 Hydraulic Excavator Shop Manual (P/N CEBM3006C2)

Komatsu Shop Manual CEBM3006C2, dated June 1996, covers the 1995–1996 PC300LC-6 and PC300HD-6, with serial numbers A80001 and up for both models. This chassis volume documents hydraulic, power train, and electrical repair, along with engine-related specifications and removal procedures.

Supplied as a 763-page PDF in English, in one file.

• Hydraulic repair: Main pump, control valve, center swivel joint, boom holding valve, and hydraulic cylinder disassembly and assembly, with component inspection standards.

• Travel and swing: Separate LC and HD final-drive and travel-motor procedures, swing-motor overhaul, swing machinery repair, and swing-circle bearing clearance checks.

• Testing and adjustment: TVC and LS pressure tests, PPC valve checks, hydraulic drift diagnosis, track tension adjustment, and hydraulic circuit air bleeding.

• Electrical troubleshooting: Electronic control system, governor/pump controller, and machine monitor system diagnosis, with service-code tables, connector pin assignments, and electrical circuit diagrams.

• Undercarriage and equipment: Idler and recoil spring service, track and carrier roller overhaul, track-shoe replacement, and boom, arm, and bucket removal.

• Engine-related work: Engine/main-pump removal, governor-motor adjustment, and radiator/hydraulic-cooler replacement; detailed engine component repair requires the separate Engine Shop Manual.

Written for service workshop personnel, the manual calls for a dustproof work area and special test equipment when overhauling hydraulic components.

Hydraulic Systems and Component Repair

The hydraulic sections explain the HPV140+140 main pump, BAR-020 control pump, and Closed Center Load Sensing System (CLSS), including pressure compensation and load relief operation. Control-valve drawings distinguish the standard 7-spool arrangement from 8-, 9-, and 10-spool configurations with additional service valves.

Factory procedures cover the pump merge/divider valve, pressure-compensation valves, PPC shuttle valve, and LS-EPC solenoid valve. Functional descriptions also address the safety lock valve and suction safety valves.

Main-pump inspection goes into contact checks between the cylinder block and valve plate, rocker cam and cradle, and valve plate and end cap. The assembly instructions explain how incorrect servo-piston tightening can damage the rocker cam and cradle.

Hydraulic circuit diagrams, hydraulic piping drawings, and CLSS operating diagrams accompany tests for work equipment, swing, and travel circuits. Hydraulic drift tests cover cylinder packing, control valves, and the boom holding valve.

Travel Drive, Undercarriage, and Structural Work

The travel-motor sections distinguish the HMV160ADT-2 for the LC from the KMV280ADT for the HD. Separate final-drive and idler procedures keep model-specific assembly details and inspection limits identifiable before repair.

Track frame and recoil spring coverage includes track-shoe selection, roller configurations, and undercarriage wear standards. Removal and installation procedures also cover the sprocket, revolving frame, operator's cab, and counterweight.

Boom, arm, and bucket cylinder procedures include internal disassembly and seal installation. Machine specification drawings accompany work-equipment dimensional tables and pin/bushing clearance limits.

Electrical Diagnosis and Engine-Related Scope

Electrical wiring diagrams and separate E-, C-, F-, and M-mode circuit diagrams support governor control, pump control, input-signal, and monitor-system troubleshooting. A connector arrangement diagram and connector pin-number tables provide pinout-level detail, alongside wire thickness and color codes.

The service code table, solenoid actuation table, bit pattern chart, and table of failure modes and causes link monitor-panel indications to circuit checks. These references help distinguish wiring or sensor faults from controller and hydraulic problems before components are removed.

Diagnostic tools include T-adapter box 799-601-7100. Governor-motor adjustment instructions warn that moving the motor lever abruptly with its spring linkage removed can generate electricity and damage the governor controller.

Engine scope: Engine-speed and exhaust-smoke checks, engine/main-pump removal, damper service, and radiator work are included. The separate Engine Shop Manual, which is not included, is required for valve-clearance measurement and detailed procedures for the fuel injection pump, turbocharger, water pump, starting motor, alternator, thermostat, engine oil cooler, engine front seal, nozzle holder, and cylinder head.

Removal and installation coverage also extends to the air conditioner compressor, condenser, air conditioner unit, governor/pump controller, and monitor panel.

Specification and Reference Data

Reference tables include standard bolt and nut tightening torques, split flange bolt and flared nut torques, fluid capacities for hydraulics, swing machinery, and engine cooling, and conversion tables.

Standard value tables cover engine, chassis, and electrical checks. Hydraulic pump delivery data, relief-valve pressure adjustments, swing-motor rotating-torque checks, and component wear limits support testing and reassembly.

Before testing pressurized systems or removing heavy assemblies, technicians must follow the manual's precautions for residual hydraulic pressure, supported work equipment, and lifting operations.

File Format and Readability

The page total includes one cover, one contents page, four revision-list pages, one publication-information page, one order form, and one manual-revision form. The 22 large-format diagram pages are also included in the total.

Text search: An embedded OCR layer supports searches across much of the manual. Some diagrams and repair pages lack searchable text, and recognition errors can affect results.

Navigation: Embedded PDF bookmarks link to the main sections and individual procedures. The legacy MAIN MENU entry points to an external file.

Diagram readability: Small connector numbers and wire codes require zooming on the large electrical schematics.