Komatsu PC400-8 PC400LC-8 PC450-8 PC450LC-8 Excavator Shop Manual SEN02223-03

Description

Komatsu PC400-8, PC400LC-8, PC450-8, PC450LC-8 Excavator Shop Manual

This Komatsu PC400-8 PC400LC-8 PC450-8 PC450LC-8 Excavator Shop Manual SEN02223-03 is the complete workshop reference for the PC400-8, PC400LC-8, PC450-8 and PC450LC-8 hydraulic excavators, serial number 70001 and up. It covers the SAA6D125E-5 engine and every major machine system — powertrain, undercarriage, hydraulics, work equipment, cab and electrical — with specifications, testing procedures, troubleshooting tables, disassembly and assembly instructions, and hydraulic and electrical diagrams.

Whether you are servicing a single machine or running a fleet, this Komatsu PC400-8 PC400LC-8 PC450-8 PC450LC-8 shop manual gives you the factory procedures and standard values needed to diagnose faults correctly and complete repairs to specification.

File Details

• Manual type: Shop Manual
• Brand: Komatsu
• Models covered: PC400-8, PC400LC-8, PC450-8, PC450LC-8
• Serial number: 70001 and up
• Engine: SAA6D125E-5
• Document number: SEN02223-03
• Language: English
• File format: PDF
• Publication date: 2008 (05-08) with earlier sections dated 2007 (04-07)
• Page count: 1,023 pages

Chapters Covered

• 00 Index and foreword — composition of shop manual, safety notice, how to read the shop manual, explanation of terms for maintenance standard, handling of connectors for engines, handling of electric equipment and hydraulic components, how to read electric wire code, precautions when carrying out operation, disassembling and connecting push-pull couplers, standard tightening torque table, conversion table
• 01 Specification — specification dimension drawings, specifications, weight table, table of fuel, coolant and lubricants
• 10 Structure, function and maintenance standard — Engine and cooling system, Power train (swing circle, swing machinery, final drive, sprocket), Undercarriage and frame (track frame and recoil spring, idler, carrier roller, track roller, track shoe), Hydraulic system Parts 1–3 (hydraulic equipment layout, hydraulic tank and filter, hydraulic pump, control valve, CLSS, attachment circuit selector valve, holding valve, valve control, solenoid valve, PPC accumulator, return oil filter, travel motor, swing motor, hydraulic cylinder), Work equipment, Cab and its attachments, Electrical system (engine control, electronic control system, monitor system, idle stop guidance, user code/failure code display, sensor, KOMTRAX)
• 20 Standard value table — standard service value table for engine related parts, standard value table for chassis related parts
• 30 Testing and adjusting — tools for testing, adjusting and troubleshooting, engine speed, air boost pressure, exhaust temperature, exhaust gas color, valve clearance, compression pressure, blow-by pressure, engine oil pressure, EGR valve drive pressure, fuel system handling, fuel pressure, cylinder cut-out operation, fuel return rate and leakage, bleeding air from fuel circuit, fuel circuit leakage, fan/alternator belt, air conditioner compressor belt, swing circle bearing clearance, track shoe tension, work equipment/swing/travel circuit oil pressure, control circuit basic pressure, pump PC and LS control circuit oil pressure, solenoid valve output pressure, PPC valve output pressure, PPC valve play, hydraulic drift inspection, residual pressure release, oil leakage testing, bleeding air from various parts
• 40 Troubleshooting — failure code table and fuse locations, general information on troubleshooting, troubleshooting by failure code (Parts 1–3), troubleshooting of electrical system (E-mode), troubleshooting of hydraulic and mechanical system (H-mode), troubleshooting of engine (S-mode)
• 50 Disassembly and assembly — general information, engine and cooling system, power train, undercarriage and frame, hydraulic system, work equipment, cab and its attachments, electrical system
• 90 Diagrams and drawings — hydraulic circuit diagram, electrical circuit diagram, connector arrangement diagram

Across these sections the manual documents the complete SAA6D125E-5 engine service data, the CLSS (Closed center Load Sensing System) hydraulic circuit, the swing and travel motor assemblies, the control valve and pressure compensation valves, the undercarriage and recoil spring, and the electronic control system linking the pump controller, engine controller and machine monitor. Standard values, repair limits and tightening torques are given alongside the procedures so that each repair can be checked against a known reference.

What This Manual Enables You To Do

With this Komatsu PC400-8 PC400LC-8 PC450-8 PC450LC-8 shop manual you can carry out engine diagnostics and top-end overhauls, rebuild final drives and swing machinery, set up and adjust the hydraulic pump and control valve, service the undercarriage, and trace electrical faults using the E-mode, H-mode and S-mode troubleshooting charts and the failure code tables. The testing and adjusting chapter walks through each pressure and speed check with standard and permissible values, so you can confirm whether a component is within specification or due for replacement.

Why Correct Procedures and Specifications Matter

Komatsu excavators in the PC400 and PC450 class rely on precise hydraulic and electronic calibration. Using the wrong pump control pressure, valve clearance or torque figure can cause poor digging performance, overheating, or premature component failure. This shop manual provides the exact measurement conditions, adjustment values, and disassembly sequences required to keep the machine running to factory tolerances.

Instant PDF Delivery

The manual is delivered as a PDF download immediately after payment — no shipping, no waiting. It can be viewed on any device, printed for the workshop, and taken to the job site. Pages are laid out in the original factory section order so you can navigate from index to specification to procedure quickly.

This Komatsu PC400-8 PC400LC-8 PC450-8 PC450LC-8 Excavator Shop Manual SEN02223-03 covers serial numbers 70001 and up and is intended for professional technicians, fleet maintenance departments and owner-operators who need the full factory service documentation for these machines.