Printed by Komatsu under publication number SEBM015903, this 661-page factory book is the Komatsu PC228US-2, PC228USLC-1, PC228USLC-2 shop manual PDF for the hydraulic excavator. Testing and Adjusting takes up about a third of the pages, with troubleshooting charts and error code tables that trace a fault from the monitor display to the connector pins and the reading expected there. From there, Disassembly and Assembly handles the starting motor, alternator and fuel injection pump, Maintenance Standard sets wear limits for the final drive, swing circle and swing machinery, and full hydraulic and electrical circuit diagrams close the book. Bring the oil to 45 to 55°C before you measure hydraulic pressure, and look for 20 to 30 V at the PPC lock solenoid with the safety lever at FREE. Nobody digs while one reading is missing. Bookmarks split the PDF by section, and the text layer lets you type a connector number and land on the right page in seconds.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| General | 27-43 | Specification Dimension Drawings, Specifications, Weight Table |
| Structure and Function | 44-158 | Engine Related Parts, Hydraulic Pump, Control Valve |
| Testing and Adjusting | 159-385 | Tools for Testing, Adjusting, And Troubleshooting, Measuring Engine Speed, Testing and Adjusting Hydraulic Pressure |
| Disassembly and Assembly | 386-613 | Starting Motor, Alternator, Fuel Injection Pump |
| Maintenance Standard | 614-656 | Final Drive, Swing Circle, Swing Machinery |
| Others | 657-661 | Hydraulic Circuit Diagram, Electrical Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| PC228USLC-1 |
| Starting motor | 24V, 4.5 kW | p. 31 |
| Battery | 12V, 110 Ah × 2 | p. 31 |
| Fuel control dial abnormality detection area | 0 to 0.25 V | p. 136 |
| Boom potentiometer voltage | 0.30 - 0.57 V | p. 174 |
| Operating Weight | 22,900 kg | p. 30 |
| All Models |
| Oil temperature when measuring | 45 - 55°C | p. 207 |
| Air bleed plug tightening torque | 17.15 ± 2.45 Nm {1.75 ± 0.25 kgm} | p. 211 |
| Potentiometer input signal voltage (Boom) | 0.31 - 0.57 V | p. 215 |
| Engine Oil Pan Capacity (Specified) | 26.3L | p. 42 |
| Hydraulic Tank Capacity (Specified) | 239L | p. 42 |
| Fuel Tank Capacity (Specified) | 340L | p. 42 |
| Offset boom specification machine |
| Potentiometer input signal voltage (Arm) | 0.33 - 1.11 V | p. 215 |
