1995+ Komatsu Avance PC128UU-1 & PC128US-1 Excavator - Shop Manual & Troubleshooting Guide (2000)

Komatsu Avance PC128UU-1 & PC128US-1 Shop Manual - Complete Service & Troubleshooting Guide

This high-quality, professional-grade Shop Manual is the ultimate resource for owners, operators, and technicians of the Komatsu Avance excavator series. Whether you are performing routine maintenance or tackling a complex hydraulic overhaul, this manual provides the technical depth and step-by-step clarity required to keep your machine in peak operational condition.

Specifically designed for the North American and international markets, this guide covers the unique "Ultra-Short Tail" and "Offset Boom" configurations that make these excavators industry favorites for confined urban jobsites.

Comprehensive Model & Serial Number Coverage

This manual is verified for the following Komatsu machine models and serial number ranges:

• PC128UU-1 (Ultra-Short Tail / Offset Boom Excavator): Serial Number 2347 and up
• PC128US-1 (Ultra-Short Tail Excavator): Serial Number 1715 and up

Both models are powered by the high-performance S4D102E-1 engine. For deep-dive engine internal repairs, this manual seamlessly integrates with the 102 Series Engine Shop Manual.

Key Technical Features & Benefits

• CLSS (Closed-center Load Sensing System): Detailed breakdowns of Komatsu’s advanced hydraulic system for precise control and fuel efficiency.
• Advanced Troubleshooting (E-Mode): Comprehensive diagnostic charts for the electronic control system, including error code interpretations (e.g., Error Codes 31-34 for Potentiometer issues).
• Maintenance Standards: Crucial data on wear limits and tolerances to help you decide when a part needs replacement versus repair.
• Electronic Control System: Deep insights into the "Automatic Horizontal Excavation" system and "One-Touch Deceleration" functions.
• Undercarriage Versatility: Covers specific maintenance for Road Liners, Triple Grouser shoes, and Integrated Rubber shoes.

What Is Included in This Manual

1. General Information (Section 01)

   • Detailed specification drawings and dimensions for transport.
   • Comprehensive Weight Tables for all major components (e.g., Revolving frame: 1,280 kg; Counterweight: 3,400 kg for PC128US-1).
   • Complete list of lubricants, fluids, and capacities for all ambient temperature ranges.

2. Structure and Function (Section 10)

   • Visual and technical explanations of the PTO (Coupling), Swing Machinery, and Travel Motors.
   • Hydraulic circuit diagrams and wiring schematics for both standard and automatic excavation models.

3. Testing and Adjusting (Section 20)

   • Standard value tables for engine and chassis performance.
   • Procedures for measuring engine speed, exhaust color, and hydraulic relief pressures.
   • Instructions for "Bleeding Air" from the hydraulic pump and cylinders.

4. Disassembly and Assembly (Section 30)

   • Professional "Removal and Installation" guides for the main pump, swing motor, and final drives.
   • Specialized instructions for the "Boom Holding Valve" and "Center Swivel Joint."

5. Maintenance Standards (Section 40)

   • Clearance and wear criteria for the swing circle, control valves, and hydraulic cylinders.

Why This Manual Is Essential

Owning this manual means you are no longer dependent on expensive dealership service calls for every minor issue. With the specific "Standard Tightening Torque" tables and "Special Tool Lists" included, you have the data to perform factory-level repairs in your own workshop or in the field.

Maximize your uptime and preserve the resale value of your Komatsu excavator by following the exact service intervals and procedures defined by the original equipment manufacturer.