Komatsu PC400-7E0 PC450-7E0 Excavator Shop Manual – SEN03578-01

Description

Komatsu PC400-7E0 PC450-7E0 Excavator Shop Manual

This Komatsu PC400-7E0 PC450-7E0 Excavator Shop Manual (Form No. SEN03578-01) is the complete workshop reference for the PC400-7E0, PC400LC-7E0, PC450-7E0 and PC450LC-7E0 hydraulic excavators. It brings together specifications, structure and function, standard value tables, testing and adjusting procedures, troubleshooting by failure code, disassembly and assembly instructions, and hydraulic and electrical diagrams in one document. Whether you are servicing the SAA6D125E-5 engine, diagnosing a hydraulic fault, or rebuilding a final drive, this manual provides the procedures and values needed to carry out the work correctly.

File Details

• Manual Type: Shop Manual
• Brand: Komatsu
• Models Covered: PC400-7E0, PC400LC-7E0, PC450-7E0, PC450LC-7E0
• Language: English
• Page Count: Approximately 1,006 pages
• File Format: PDF
• Form Number: SEN03578-01
• Date: 2008

Chapters Covered

• 00 Index and Foreword — Organization list of the shop manual, table of contents, safety notice, how to read the shop manual, explanation of terms for maintenance standard, handling of electric equipment and hydraulic components, handling of connectors newly used for engines, how to read electric wire code, precautions when carrying out operation, method of disassembling and connecting push-pull type coupler, 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 (engine related parts, radiator, oil cooler and aftercooler), Power train (power train, final drive, sprocket, swing machinery, swing circle), Undercarriage and frame (track frame and recoil spring, idler, carrier roller, track roller, track shoe), Hydraulic system Part 1 (hydraulic equipment layout drawing, hydraulic tank and filter, hydraulic pump), Hydraulic system Part 2 (control valve, CLSS, functions and operation by valve, merge-divider valve, attachment circuit selector valve, holding valve), Hydraulic system Part 3 (valve control, PPC valve, solenoid valve, PPC accumulator, return oil filter, center swivel joint, travel motor, swing motor, hydraulic cylinder), Work equipment, Cab and its attachments, Electrical system (engine control, electronic control system, monitor system, sensor, KOMTRAX terminal system)
• 20 Standard Value Table — Standard value table for engine related parts, standard value table for chassis related parts (backhoe specification), standard value table for chassis related parts (loading shovel specification)
• 30 Testing and Adjusting — Tools for testing, adjusting and troubleshooting; measuring engine speed; measuring air boost pressure; measuring exhaust temperature; measuring exhaust gas color; adjusting valve clearance; measuring compression pressure; measuring blow-by pressure; measuring engine oil pressure; handling fuel system parts; releasing residual pressure from fuel system; measuring fuel pressure; handling during cylinder cut-out operation; handling during no injection cranking operation; measuring fuel return rate and leakage; bleeding air from fuel circuit; checking fuel circuit for leakage; checking and adjusting fan belt and alternator belt tension; checking and adjusting air conditioner compressor belt tension; measuring swing circle bearing clearance; checking and adjusting track shoe tension; measuring and adjusting oil pressure in work equipment, swing, and travel circuits; measuring control circuit basic pressure; checking and adjusting pump PC control circuit oil pressure; checking and adjusting pump LS control circuit oil pressure; measuring solenoid valve output pressure; measuring PPC valve output pressure; adjusting play of work equipment and swing PPC valves; inspecting locations of hydraulic drift of work equipment; releasing residual pressure from hydraulic circuit; measuring oil leakage amount; bleeding air from various parts; special functions of machine monitor; procedure for turning on KOMTRAX terminal; indication by KOMTRAX terminal lamps; handling voltage circuit of engine controller; preparation work for troubleshooting of electrical system; procedure for testing diodes; Pm clinic service; undercarriage troubleshooting report
• 40 Troubleshooting — Failure code table and fuse locations; information related to troubleshooting (points to remember, sequence of events, checks before troubleshooting, classification and troubleshooting steps, information in troubleshooting table, connection table for connector pin numbers, T-branch box and T-branch adapter table); Troubleshooting by failure code (Display of code) Part 1, Part 2, Part 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 on disassembly and assembly (how to read this manual, coating materials list, special tools list, sketches of special tools); Engine and cooling system (removal and installation of fuel supply pump assembly, fuel injector assembly, engine front seal, engine rear seal, cylinder head assembly, radiator assembly, hydraulic oil cooler assembly, aftercooler assembly, engine and hydraulic oil pump assembly); Power train (final drive assembly, swing motor and swing machinery assembly, swing circle assembly); Undercarriage and frame (carrier roller assembly, track roller assembly, idler assembly, recoil spring assembly, sprocket, track shoe assembly, revolving frame assembly, counterweight assembly); Hydraulic system (center swivel joint assembly, hydraulic tank assembly, control valve assembly, hydraulic pump assembly, oil seal in hydraulic pump input shaft, work equipment PPC valve assembly, travel PPC valve assembly, hydraulic cylinder assembly); Work equipment; Cab and its attachments (operator’s cab, operator’s cab glass, front window assembly); Electrical system (air conditioner unit assembly, KOMTRAX terminal assembly, monitor assembly, pump controller)
• 90 Diagrams and Drawings — Hydraulic circuit diagram, electrical circuit diagram, connector arrangement diagram

This Komatsu PC400-7E0 PC450-7E0 Excavator Shop Manual goes well beyond a basic service guide. The structure, function and maintenance standard chapter explains how each major component works and what the maintenance criteria are, serving as reference material for troubleshooting. The standard value table gives the specifications and judgement criteria needed to evaluate parts during testing and adjusting. The testing and adjusting chapter provides the measuring instruments, methods, and adjustment procedures for the engine, hydraulic system, swing, travel, and work equipment circuits. The troubleshooting section is divided by failure mode and includes failure code tables, electrical system diagnostics, hydraulic and mechanical system diagnostics, and engine troubleshooting. The disassembly and assembly section covers the special tools, removal, installation, disassembly, and assembly procedures for the major components, along with tightening torques and coating materials. The diagrams section rounds out the manual with hydraulic circuit diagrams and electrical circuit diagrams.

For anyone maintaining, repairing, or rebuilding a PC400-7E0, PC400LC-7E0, PC450-7E0, or PC450LC-7E0 excavator, this Komatsu PC400-7E0 PC450-7E0 Excavator Shop Manual provides the complete technical foundation. The engine coverage alone makes it valuable, but the hydraulic system and electrical system sections are equally important for diagnosing the complex issues these machines can develop. The disassembly and assembly procedures help ensure that components are removed, inspected, and reinstalled correctly, with the proper tools and torque values. The troubleshooting tables and failure code diagnostics can save hours of guesswork by pointing directly at the affected circuit or component.

What This Manual Enables You to Do

• Identify and resolve Komatsu PC400-7E0 PC450-7E0 excavator fault codes using the detailed failure code troubleshooting tables covering engine, electrical, hydraulic, and mechanical systems.
• Measure, test, and adjust the engine and hydraulic systems using the procedures and standard values given for the SAA6D125E-5 engine and the closed-center load sensing (CLSS) hydraulic system.
• Disassemble and reassemble major components — final drive, swing machinery, hydraulic pump, control valve, travel motor, swing motor, hydraulic cylinders, and work equipment — using the special tool lists, removal and installation steps, and tightening torques.
• Understand the structure and function of each major system, from the engine and cooling system through the power train, undercarriage, hydraulic system, and electrical system, including the electronic control system, monitor system, and KOMTRAX terminal.
• Perform routine testing and adjusting tasks such as measuring engine speed, boost pressure, exhaust temperature, valve clearance, compression pressure, oil pressure, and hydraulic circuit pressures.

Why the Komatsu PC400-7E0 PC450-7E0 Excavator Shop Manual Matters

Working on a hydraulic excavator without the correct specifications and procedures invites costly mistakes. A hydraulic pressure set incorrectly, a torque value guessed at, or a failure code misdiagnosed can lead to component damage, downtime, and unnecessary parts replacement. This manual provides the values, tolerances, and step-by-step methods that Komatsu specifies for these machines, so the work is done right the first time. The troubleshooting sections are particularly valuable because they walk through the diagnostic logic for the electrical, hydraulic, and mechanical systems, helping to pinpoint the root cause rather than just the symptom.

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The Komatsu PC400-7E0 PC450-7E0 Excavator Shop Manual is delivered as an instant PDF download after payment. There is no shipping, no waiting for a physical book, and no restrictions on where or how you use it. You can access it on any device — laptop, tablet, or smartphone — and print the pages you need for the workshop. The searchable text makes it quick to locate a specific specification, failure code, or procedure, so you spend less time flipping through pages and more time getting the machine back in service.