Komatsu PC45MR-3 PC55MR-3 Hydraulic Excavator Shop Manual PDF Download

Description

Manual Overview

This is the official factory shop manual for the Komatsu PC45MR-3 and PC55MR-3 hydraulic excavators. Produced by Komatsu, this comprehensive technical document provides all the information required for workshop-level service, repair, maintenance, and troubleshooting. It is the definitive resource for professional mechanics and serious owners working on these compact excavators.

Models & Equipment Covered

This manual is specifically designed for the following excavator models and serial number ranges:

• Komatsu PC45MR-3 — Serial Numbers: 5001 and up
• Komatsu PC55MR-3 — Serial Numbers: 15001 and up

The manual covers both Canopy and Cab specifications, with detailed information on the Komatsu 4D88E-6 engine (28.5 kW / 38.2 HP), the Closed Center Load Sensing System (CLSS) hydraulic system, and all undercarriage and work equipment components.

Main Systems & Subjects Included

This massive 680+ page manual is structured to provide complete technical support for every major system:

• 00. Index and Foreword — Safety notices, how-to-read instructions, standard torque tables, and conversion tables.
• 01. Specification — Complete machine specifications, dimension drawings, working range charts, weight tables, and fluid capacity charts.
• 10. Structure, Function, and Maintenance Standard — Detailed breakdown of engines, cooling systems, power trains, undercarriages, and hydraulic system components (pumps, motors, valves).
• 20. Standard Value Table — Standard service values for engine and chassis components, including pressures, speeds, and clearances.
• 30. Testing and Adjusting — Procedures for testing engine performance, hydraulic pressures, travel deviation, and adjusting key components like valve clearance, fuel injection timing, and the LS differential pressure.
• 40. Troubleshooting — Extensive troubleshooting guides for electrical (E-mode), hydraulic/mechanical (H-mode), and engine (S-mode) systems, complete with failure code tables.
• 50. Disassembly and Assembly — Step-by-step instructions for removing and installing major assemblies, including the engine, hydraulic pump, swing motor, track components, and hydraulic cylinders.
• 90. Diagrams and Drawings — Full hydraulic circuit diagrams and electrical wiring schematics.

Repair & Maintenance Coverage

This manual enables you to perform a full range of service tasks:

• Engine Repair — Fuel injection pump removal/installation, valve clearance adjustment, compression testing.
• Hydraulic System Overhaul — Pump, motor, and control valve disassembly and assembly. Detailed CLSS operation and pressure adjustments.
• Undercarriage Service — Track shoe removal, idler and roller disassembly, recoil spring assembly, and track tension adjustment.
• Electrical Diagnosis — Complete wiring diagrams and step-by-step troubleshooting for starting, charging, and control systems.
• Component Rebuilds — Complete procedures for rebuilding the swing machinery, travel motors, and hydraulic cylinders.

Why This Manual Is Useful

Owning this OEM shop manual gives you dealer-level diagnostic and repair capability for your PC45MR-3 or PC55MR-3 excavator. Instead of relying on guesswork or sending the machine away for costly repairs, you can accurately troubleshoot problems, perform critical adjustments, and complete major overhauls yourself. This manual is an essential investment for reducing downtime and maintenance costs.

Instant PDF Download

This digital edition is available for immediate download upon purchase. Delivered in high-resolution PDF format, it is searchable and can be viewed on your computer, tablet, or smartphone, ensuring you have the critical information you need right at your workspace.