Komatsu PC400-8 PC400LC-8 PC450-8 PC450LC-8 Hydraulic Excavator Operation & Maintenance Manual

Description

Komatsu PC400-8 / PC450-8 Operation & Maintenance Manual

This is the full Operation & Maintenance Manual for the Komatsu PC400-8, PC400LC-8, PC450-8 and PC450LC-8 hydraulic excavators. It is the reference Komatsu supplies with the machine so that operators and maintenance personnel can run, inspect, service and troubleshoot the excavator safely and correctly. The document is issued as form number PEN00360-01 and applies to machines from serial number PC400-70290 and up and PC450-70290.

Inside, the manual walks through every major system on the machine in the order a working technician actually needs it — daily checks, start-up and warm-up, operating the work equipment, shutting down, then the full periodic maintenance programme with hour-based service intervals, plus specifications and attachment guidance. Because this same manual covers both the PC400 and PC450 families, it also gives the small dimensional and capacity differences between the four variants (standard and LC undercarriage) so the correct figures can be applied to the correct machine.

File Details

• Manual type: Operation & Maintenance Manual
• Brand: Komatsu
• Models covered: PC400-8, PC400LC-8, PC450-8, PC450LC-8
• Document number: PEN00360-01
• Language: English
• Pages: 387
• File format: PDF
• Publication date shown: 09-09
• Engine covered: Komatsu SAA6D125E-5 diesel engine

Chapters Covered

The table of contents reflects the structure Komatsu uses across its excavator manuals, and every section below is present in this file:

• 1. Foreword and Introduction
  • Before reading this manual
  • Safety information and signal words
  • Use of machine and directions of machine
  • Visibility from operator’s seat
  • Product identification number (PIN) / machine serial no. plate
  • EPA regulations, engine number plate, service meter location
• 2. Safety
  • Safety labels and their locations on the machine
  • General precautions common to operation and maintenance
  • Precautions before starting operation and preparations for safe operation
  • Fire prevention and precautions when getting on or off the machine
  • Precautions related to protective structures (ROPS / FOPS)
  • Precautions for operation, jobsite, starting engine, transportation, towing and lifting
  • Precautions for maintenance — including high-pressure oil, high-temperature coolant, high-voltage, and accumulator handling
• 3. Operation
  • Machine view illustrations and overall machine view
  • Controls and gauges — detailed breakdown
  • Monitoring system: emergency monitors, caution monitors, basic check monitors, meter display, ECO gauge
  • Switches, control levers and pedals
  • Sun roof, windshield and door lock
  • Cap with lock, drink box, magazine box, ashtray
  • Air conditioner controls (auto and manual operation)
  • Radio operation and antenna
  • Fuse, fusible link and controllers
  • Machine operations and controls — before starting engine, starting engine, moving, steering, swinging, work equipment controls, working mode, prohibited operations
  • Transportation, lifting machine, transportation posture, and track frame gauge procedure
  • Cold weather operation, long term storage and troubleshooting actions
  • Other trouble and electronic control system diagnostics
• 4. Maintenance
  • Maintenance information and outline of service
  • Wear parts list and recommended fuel, coolant and lubricant
  • Tightening torque specifications
  • Safety critical parts list
  • Maintenance schedule chart with interval-based service
  • Maintenance interval for hydraulic breaker
  • Maintenance procedures for every interval: initial 1000 hours, when required, every 50 / 100 / 250 / 500 / 1000 / 2000 / 4000 / 5000 / 8000 hours
  • Air cleaner element cleaning and replacement, cooling system cleaning, track tension, bucket teeth and side cutter replacement, bucket clearance
  • Engine oil, fuel filters, hydraulic oil filter, swing machinery, final drive and damper case oil procedures
  • Bleeding air from the hydraulic system and releasing pressure in the hydraulic circuit
  • Checking charge pressure of nitrogen gas in accumulator
• 5. Specifications
  • Operating weight, bucket capacity and engine data
  • Overall dimensions for all four models
  • Working ranges — digging reach, digging depth, digging height, dumping height
• 6. Attachments and Options
  • General precautions for safety with attachments
  • Bucket with hook
  • Machine ready for attachment — locations, stop valve, selector valve, attachment control pedal, lock pin
  • Hydraulic circuit, oil flow path and additional breaker filter
  • Attachment removal, installation and operations
  • Handling the electric priming pump
  • Attachment guide, track shoes selection and recommended attachment operations
  • Handling machines equipped with KOMTRAX
• 7. Index

Between the covers, this Komatsu PC400-8 PC450-8 manual collects everything from first-start-of-day checks through to full component service. The operation chapter is written so an operator can safely run the machine and understand every warning monitor and switch before it lights up; the maintenance chapter converts the same material into an hour-driven schedule with the actual procedures and torque values to carry it out. The specification chapter gives the figures that matter for transport planning and job setup, and the attachment chapter covers how to safely put a breaker, crusher or other attachment to work on these excavators. It is not a workshop overhaul manual, but it is the document Komatsu expects the machine to be operated and serviced from.

What This Manual Covers in Use

The content is organised so that a working owner, operator or maintenance technician can move directly to the answer they need. The monitoring system chapter explains the machine monitor in detail — emergency monitors, caution monitors, basic check monitors, the engine coolant and hydraulic oil temperature gauges, fuel level monitor, engine oil pressure, air cleaner clogging, maintenance interval indicator and the ECO gauge, plus the working mode and travel speed displays. The operation chapter covers starting the engine, warming up the engine and hydraulic equipment, moving forward and reverse, steering, swing operation, work equipment control, and the recommended applications (backhoe, shovel, ditching and loading work). It also walks through prohibited operations that shorten machine life — swing force for compacting, digging with travel force, cylinder stroke-end loading, and operating the bucket as a lever.

For maintenance planning, the schedule chart groups service by interval so it is easy to see at a glance what is due: initial 1000-hour service, then every 50, 100, 250, 500, 1000, 2000, 4000, 5000 and 8000 hours. Included are the wear parts list, the recommended fuel / coolant / lubricant table, and the tightening torque specifications for metric bolts and hydraulic hose fittings. This is the section that makes the Komatsu PC450-8 maintenance manual a genuinely useful long-term reference rather than a one-time read.

Safety content is heavy and deliberate — as you would expect from a Komatsu manual. It includes label locations on the machine, precautions for getting on and off, ROPS/FOPS limitations, handling accumulator and gas spring, high-pressure oil injury prevention, high-voltage precautions, and emergency escape from the operator’s cab. Operators new to this size of machine benefit from reading this section before doing anything else.

Who This Manual Is For

Owners running a PC400-8 or PC450-8 in earthmoving, quarrying, demolition or general excavation will find this the reference to keep in the cab for daily checks, warnings and periodic service. Service technicians, fleet managers and maintenance planners can use it as the basis for planning intervals, ordering the right filters, and applying the correct fluid capacities and tightening torques. It also supports operator training and site-specific procedure writing, since the safety and operation chapters map directly to the machine’s own labels and control layout.

Because both undercarriage variants and both engine platforms are covered, the manual is useful across the whole PC400/PC450-8 series rather than a single machine. The differences in track length, operating weight and working ranges between PC400-8, PC400LC-8, PC450-8 and PC450LC-8 are all listed in the specification tables, so you can apply the correct figures to whichever unit is on site.

What You Can Do With This Manual

With this Komatsu PC400-8 PC400LC-8 PC450-8 PC450LC-8 Operation & Maintenance Manual on hand you can correctly perform daily walk-around checks, interpret every monitor lamp and warning on the machine display, start and warm the machine safely, operate the work equipment and travel controls as intended, plan and carry out all scheduled maintenance from the 50-hour greasing up to the 8000-hour replacement tasks, replace wear parts like bucket teeth and side cutters, adjust track tension, bleed air from the fuel and hydraulic systems, and install or remove an attachment using the correct hydraulic circuit and lock pin positions.

Following the procedures and specifications printed in this manual is what keeps a Komatsu excavator reliable, safe and productive in the long run. Incorrect fluid choices, incorrect torque values, or short-cutting the safety steps can turn routine work into a costly failure or a serious injury. Having the exact Komatsu figures in front of you removes that risk.

IMAGES PREVIEW

This listing is delivered as an instant-download PDF — no shipping, no waiting. The file can be opened on any device with a PDF reader, viewed on a laptop in the workshop or tablet in the cab, and printed page-for-page if you prefer a paper copy beside the machine. Keep it with the excavator for the life of the machine.