Your next pre-start walkaround goes by the book with this 289-page Komatsu PC78US-6 Operation and Maintenance Manual PDF (OEM ID SEAM044602T) open beside the hydraulic excavator, from fluid levels to greasing bucket pins. Roughly a quarter of the book is maintenance: a schedule chart running from the initial 250-hour check out to the 5000-hour service, a wear parts list, lubricant and coolant tables, and a tightening torque list. Ahead of that sit the monitor panel and switch layout, starting and travel procedures, slope and mud recovery, trailer loading and lifting, cold-weather operation, and an attachment section covering hydraulic breaker use and control pattern changes. Refill with 7 liters of engine oil when you change the oil and fuel filters at 500 hours, and hold 9/16-18UNF hydraulic hose fittings to 35 to 63 N·m. An oil change stalls fast over one missing refill figure. Bookmarks and a searchable text layer take you to the right interval or warning light in two clicks.
What's Inside This Operator Manual
| System | Pages | Key Topics |
|---|
| Safety | 16-53 | Safety Information, Safety Labels (Location of Safety Labels) |
| Machine View Illustrations and Controls | 54-71 | Machine View Illustrations, Monitoring System, Switches, Control Levers and Pedals |
| Machine Operations and Controls | 72-108 | Starting Engine, Stopping Engine, Machine Operation, Traveling, Swinging, Work Equipment Controls |
| General Operation Information | 109-148 | Prohibited Operations, Traveling on Slopes, Escape From Mud, Recommended Applications, Bucket Replacement |
| Transportation and Cold Weather Operation | 149-171 | Transportation Procedure, Loading and Unloading, Lifting Machine, Cold Weather Operation |
| Troubles and Actions | 172-185 | Running Out of Fuel, Towing, Discharged Battery, Electronic Control System, Machine Monitoring System |
| Maintenance | 186-259 | Maintenance Information, Lubricants, Coolant and Filters (Handling Oil, Fuel, Coolant, And Performing Oil Clinic, Electric System Maintenance), Wear Parts (List) |
| Specifications | 260-263 | Operating Weight, Bucket Capacity, Engine Horsepower, Overall Length, Overall Height, Track Width |
| Attachments and Options | 264-285 | Attachments and Options - General Inforamtion (Safety First, Attachment Installation, Bucket with Hook) |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Fuel filter replacement frequency | EVERY 500 HOURS SERVICE | p. 192 |
| Engine oil filter replacement frequency | EVERY 500 HOURS SERVICE | p. 192 |
| Engine oil refill capacity | 7 liters | p. 245 |
| Hydraulic hose tightening torque (9/16-18UNF) | 35 - 63 N·m | p. 197 |
| Hydraulic hose tightening torque (11/16-16UN) | 54 - 93 N·m | p. 197 |
| Hydraulic Hose Tightening Torque (1-14UNS) | 128-186 N·m | p. 197 |
| Standard deflection (steel shoes) | 10 to 30 mm (0.4 to 1.2 in) | p. 211 |
| Standard deflection (rubber shoes) | 1 to 3 mm (0.039 to 0.118 in) | p. 215 |
| Operating Weight (Steel shoe) | 7,190 kg | p. 261 |
| Operating Weight (Road liner) | 7,220 kg | p. 261 |
| Tightening Torque (M16 bolt) | 235-285 N·m | p. 197 |
| Tightening Torque (M24 bolt) | 785-980 N·m | p. 197 |
