Komatsu PC78UU-6 and PC78US-6 Mini Excavator Shop Manual (SEBM025118)

SEBM025118 covers the PC78UU-6 and PC78US-6, Komatsu's zero and short-tail 7-tonne class excavators. It has a full section on the offset boom.

Fits

PC78UU-6 from serial 22832 and PC78US-6 from serial 4001. Engines listed are the 4D95LE-2 and S4D95LE-3-A. For engine overhaul on the 4D95LE-2, see our SEBM018803.

Quick facts

• Manual Number: SEBM025118
• Models: PC78UU-6, PC78US-6
• Serials: 22832 / 4001 and up
• Engines: 4D95LE-2, S4D95LE-3-A
• Machine Type: Mini excavator
• Format: PDF, 1,025 pages

What's in it

After the general specs and fluids, section 10 covers structure, function and maintenance standards for the swing machinery, travel motor, final drive, hydraulic pump, CLSS control valve, PPC and EPC valves, blade, offset boom, work equipment and electrical. Section 20 gives the standard values, pressure checks, adjustments and troubleshooting.

Section 30 covers disassembly and assembly. Section 50 is unusual: it lists the parts that differ on the PC78US-6 built for Norway. Section 90 has the circuit diagrams.

These machines are a favorite with utility contractors and builders in towns, and the offset boom is what makes them useful in tight spaces. It's also a common source of wear and leaks, so the offset boom pages get used a lot.

Table of contents

• 01 General - specs, weight table, fuel, coolant and lubricants
• 10 Structure, function and maintenance standard - swing machinery, travel motor, final drive, hydraulic pump, CLSS control valve, PPC and EPC valves, blade, offset boom, work equipment, electrical
• 20 Testing and adjusting - standard values, pressure checks, adjustments and troubleshooting
• 30 Disassembly and assembly - removal, installation and rebuild of the main components
• 50 Other specifications - parts that differ on the PC78US-6 for Norway
• 90 Others - hydraulic and electrical circuit diagrams

Before you buy

Two models with different serial starts. Check your plate.

PDF, 1,025 pages, English. Download link straight after checkout. We're an independent seller with no link to Komatsu.