When a swing motor goes lazy or a final drive starts weeping oil, the Komatsu PC100-5, PC120-5 shop manual PDF (OEM ID SEBM02020508) puts 644 pages of factory data behind your repair, covering both hydraulic excavators plus the PC120-5 Mighty. Testing and Adjusting is the heaviest chapter, roughly two fifths of the book, built around the standard value table, hydraulic pressure checks and troubleshooting charts that walk a fault from symptom to failed component. Hydraulic schematics show oil routing from pump to cylinders, wiring diagrams trace the electrical circuits, and the Maintenance Standard sets wear limits for final drive, swing machinery and track rollers. Refill the hydraulic system with 100 L of its 150 L total and keep 12 L in the engine oil pan. A guessed relief pressure can split a hose. Bookmarks take you straight to the right chapter, and text search lands on any spec in seconds.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| Structure and Function | 25-190 | Engine Related Parts, Hydraulic Tank and Fuel Tank, Hydraulic Pump |
| Standard Value Table | 192-235 | Table of Judgement Standard Value, Standard Value Table for Electrical System, Adjusting Valve Clearance, Measuring Compression Pressure |
| Testing and Adjusting Hydraulic Pressure | 236-261 | Testing and Adjusting Charging Pump Pressure, Testing and Adjusting Main Pump Control Pressure, Testing and Adjusting Travel Deviation, Adjusting PPC Valve, Bleeding Air |
| Troubleshooting | 262-448 | Troubleshooting of Pump Controller System (C Mode), Troubleshooting of Pump Controller Input Signal System (F Mode), Troubleshooting of Hydraulic and Mechanical System (H Mode), Troubleshooting of Monitor System (P Mode) |
| Disassembly and Assembly | 449-607 | Starting Motor and Alternator, Engine Oil Cooler and Fuel Injection Pump, Water Pump and Nozzle Holder |
| Maintenance Standard | 608-644 | Final Drive, Swing Machinery, Track Roller |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Engine oil pan capacity (Specified) | 12 L | p. 22 |
| Hydraulic system capacity (Refill) | 100 L | p. 22 |
| Hydraulic System Capacity (Specified) | 150L | p. 24 |
| Fuel tank capacity | 250 L | p. 52 |
| Fuel Tank Capacity (Specified) | 250L | p. 24 |
| Arm cylinder rod outside diameter | 75 mm | p. 130 |
| Arm cylinder inside diameter | 115 mm | p. 130 |
| Hydraulic drift (no load) - PC120 Boom | Max. 10 mm | p. 396 |
| PC100-5 Serial No. 28001-29805, PC120-5 Serial No. 30001-32304 |
| Hydraulic tank capacity | 150 L | p. 52 |
| Hydraulic tank oil amount | 100 L | p. 52 |
| PC100-5 |
| Governor motor linkage angle (PC100) | 48° ± 4°12' | p. 142 |
| PC120-5 |
| Governor motor linkage angle (PC120) | 50° ± 4°12' | p. 142 |
