A swing motor that drifts, a travel motor that loses power, a pump controller throwing codes onto the monitor panel: this Komatsu PC228US-3, PC228USLC-3 shop manual PDF (OEM ID SEBM023104) is the 598-page factory book for tracing those faults on both hydraulic excavators. Troubleshooting fills the largest share, tracing electrical fault modes through the pump controller, monitor panel and connector pin tables before full hydraulic and electrical circuit diagrams close the book. Disassembly chapters take the final drive, travel motor, swing machinery and control valve apart, while testing procedures handle hydraulic pressure, track shoe tension and air bleeding. Confirm the PPC oil pressure switch turns ON at 0.5 ± 0.1 MPa, and torque the swing machinery mounting bolts to 590 to 608 N·m. Guessing costs you a seal kit and a second teardown. Bookmarked, searchable pages help you confirm the failed component, so the right part gets ordered the first time.
What's Inside This Komatsu PC228US-3, PC228USLC-3 Manual
| System | Pages | Key Topics |
|---|
| General | 27-38 | Specification Dimension Drawings, Specifications, Weight Table |
| Structure, Function and Maintenance Standard | 39-210 | Track Frame and Recoil Spring, Hydraulic Pump, Control Valve, Swing Motor, Travel Motor |
| Standard Value Tables | 211-230 | Engine Standard Values, Chassis Standard Values, Electrical Related Parts Standard Values |
| Testing and Adjusting Procedures | 231-266 | Engine Speed Measurement, Valve Clearance Adjustment, Hydraulic Pressure Testing, Track Shoe Tension, Air Bleeding Procedures |
| Troubleshooting Introduction and Methods | 267-300 | Troubleshooting Sequence, Maintenance Precautions, Connector Types, Connector Pin Tables |
| Troubleshooting - Electrical Systems (N, E, C, F, M Modes) | 301-486 | Communication Abnormality, Engine Throttle and Pump Controller, Monitor Panel System, Electrical Circuit Diagrams |
| Disassembly and Assembly | 487-580 | Engine Assembly, Final Drive and Travel Motor Assembly, Swing Motor and Swing Machinery Assembly, Control Valve Assembly |
| Others | 581-598 | Hydraulic Circuit Diagram, Electrical Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Balance stop position pressure range | 0.69 MPa to 2.2 MPa | p. 72 |
| EPC valve output pressure range | 0 MPa to 2.9 MPa | p. 72 |
| Swing machinery mounting bolt | 590 - 608 N·m | p. 526 |
| Swing motor assembly mounting bolt torque | 58.8 - 73.5 N·m | p. 533 |
| PPC oil pressure switch Operating (ON) pressure | 0.5 ± 0.1 MPa {5.0 ± 1.0 kg/cm²} | p. 196 |
| PPC oil pressure switch Resetting (OFF) Pressure | 0.3 ± 0.5 MPa {3.0 ± 0.5 kg/cm²} | p. 196 |
| Track roller plug torque | 14.9 ± 5.0 N·m | p. 543 |
| Engine oil pan capacity (refill) | 24 L | p. 38 |
| Hydraulic system capacity (refill) | 126 L | p. 38 |
| Fuel tank capacity | 320 L | p. 38 |
| PC228US-3 |
| Operating weight | 21,800 kg | p. 30 |
| PC228USLC-3 |
| Operating weight | 23,100 kg | p. 32 |
