Official-Issue Komatsu PC78US-6 & PC78UU-6 Excavator Service Manual - Precision Maintenance, Diagnostics & Repair
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Sample pages from the Official-Issue Komatsu PC78US-6 & PC78UU-6 Excavator Service Manual - Precision Maintenance, Diagnostics & Repair manual
Purchase Information
Komatsu PC78UU-6, PC78US-6 excavator shop manual - Technical Specifications
- Document Number / Seller:
- 30458 / Sarah Stewart
- File Size:
- 45.31 MB
- File Type:
- Language:
- English
- Pages:
- 1027
- Printable:
- Yes
- Estimated Download Time:
- 0.93 Minutes
- Delivery Format:
- Digital (PDF) - Instant Access
- Category:
- Excavator
- Brand:
- Komatsu
- Reviewed and Approved:
- Dec 21, 2025
Komatsu Models and Parts Covered in this Excavator Manual
Komatsu PC78 Series
- PC78UU-6 (1998-2007)
- PC78US-6 (1998-2007)
Complete Manual Information
Komatsu PC78UU-6 & PC78US-6 Excavator Shop Manual | Complete Service, Repair & Maintenance Guide
Keep your Komatsu excavators running at peak performance with the definitive technical resource. This professional-grade shop manual covers the Komatsu PC78UU-6 and PC78US-6 models, providing deep-dive technical data, troubleshooting procedures, and step-by-step assembly instructions essential for owners, fleet managers, and heavy equipment technicians.
Precise Model & Serial Number Coverage
This manual is specifically engineered for the following machines:
- PC78UU-6: Serial Number 22832 and up
- PC78US-6: Serial Number 4001 and up
- PC78US-6 (Norway & EU Specification): Serial Number 4809 and up
Engine Specifications Included
The guide provides full support for the high-performance Komatsu engines mounted in these models:
- Komatsu 4D95LE-2 Diesel Engine (Serial No. Range: PC78UU-6: 22832-23500 | PC78US-6: 4001-5500)
- Komatsu S4D95LE-3-A Turbocharged Diesel Engine (Serial No. Range: PC78UU-6: 23501 and up | PC78US-6: 5501 and up)
Comprehensive Technical Sections
Maximize your uptime with detailed chapters organized for fast navigation:
- 01 General Information: Machine dimensions, weight tables, and complete performance specifications.
- 10 Structure, Function & Maintenance Standard: In-depth explanations of the PTO, cooling system, and the advanced hydraulic pump systems (LPD45+45).
- 20 Testing and Adjusting: Critical data for engine speed adjustments, hydraulic pressure relief settings (26.5 MPa / 3,840 PSI), and electrical system diagnostics.
- 30 Disassembly and Assembly: Professional procedures for removing and installing components like the control valve, swing machinery, and hydraulic cylinders.
- 50 Other Specifications: Special technical data for Norway and EU-specific models, including the boom hydraulic anti-burst valve and overload alarm functions.
Why This Manual is Essential
- Elite Troubleshooting: Includes monitoring codes and error code lists (e.g., E02, E03, E431) to identify electrical and hydraulic faults instantly.
- Detailed Hydraulics: Full coverage of the 7-spool and 8-spool control valves, variable-capacity piston motors, and PPC lock functions.
- Maintenance Accuracy: Provides exact tightening torques for metric bolts, O-ring boss joints, and split flange bolts to ensure structural integrity.
- Mobile-Friendly Layout: Clear, bulleted information and logical section breaks make this guide easy to read on your phone or tablet while you are in the field.
Stop guessing and start repairing with the factory-level precision that only a genuine Komatsu shop manual can provide.
Note: Pricing and download availability are determined by the seller. Review the FAQ for lifetime download guarantee details.
Download Instructions for Komatsu Excavator Manual
Frequently Asked Questions - Komatsu Excavator Manual
What does this Komatsu manual cover?
This comprehensive service manual covers detailed repair procedures, maintenance schedules, troubleshooting guides, and technical specifications for Official-Issue Komatsu PC78US-6 & PC78UU-6 Excavator Service Manual - Precision Maintenance, Diagnostics & Repair. It includes information for the following models: **Komatsu PC78 Series** - PC78UU-6 (1998-2007) - PC78US-6 (1998-2007).
Is this manual suitable for beginners?
Yes, this Komatsu manual is designed for both professional technicians and DIY enthusiasts. It includes step-by-step procedures with clear illustrations and safety guidelines for Excavator maintenance and repair.
What file format will I receive?
You will receive this manual as a PDF file (45.31 MB), which is compatible with all devices. The manual is fully searchable and printable for your convenience.
How quickly can I access the manual after purchase?
You'll receive instant access to your Komatsu Excavator manual immediately after payment completion. The download link is valid for 3 days, with lifetime re-download guarantee.
Can I print specific sections of the manual?
Absolutely! This digital manual allows you to print any section you need, from individual pages to complete chapters, making it perfect for workshop use.
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