Shop manual SEBM000906 applies to a single machine, the PC50UU-2 hydraulic excavator, and this 828-page Komatsu PC50UU-2 service manual PDF reproduces it, so you know it fits the unit in your yard before a cover comes off. Testing and Adjusting fills over a third of the book, and its judgement standard value tables give you the factory figure to hold each pressure and electrical reading against. Disassembly and Assembly runs about as long, covering the fuel injection pump, cylinder head, swing machinery and swing motor, while hydraulic and electric circuit diagrams trace the lines from main pump to spool control valve. Fill the engine oil pan to 9.1 L (8.5 L on a refill) and run standard 10 mm bolts to 66 ± 7 Nm. Some days it's you, the machine, and nobody to ask. Bookmarked by section and text-searchable, the PDF sits on the laptop in your service truck, so it goes wherever the excavator does.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| General | 27-44 | General Assembly Drawing, Specifications, Weight Table |
| Structure and Function | 45-170 | Power Train System, Swing Machinery, Track Frame, Hydraulic Piping Diagram, Main Pump, Spool Control Valve, Swing Motor |
| Testing and Adjusting | 171-463 | Table of Judgement Standard Value, Standard Value Table for Electrical Parts, Tools for Testing, Adjusting, And Troubleshooting |
| Disassembly and Assembly | 464-759 | Starting Motor, Alternator, Fuel Injection Pump, Water Pump, Cylinder Head, Swing Machinery and Swing Motor |
| Maintenance Standard | 760-819 | Swing Machinery, Idler, Track Roller |
| Others | 820-828 | Hydraulic Circuit Diagram, Electric Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Standard tightening torque for metric bolts (6mm) | 13.2 ± 1.4 Nm | p. 16 |
| Standard tightening torque for metric bolts (8mm) | 31 ± 3 Nm | p. 16 |
| Engine oil pan capacity (Specified) | 9.1 L | p. 42 |
| Engine oil pan capacity (Refill) | 8.5 L | p. 42 |
| Pressure valve relief cracking pressure | 38.3 ± 14.7 kPa | p. 62 |
| Pressure valve suction cracking pressure | 0 - 4.5 kPa | p. 62 |
| Oil temperature when measuring | 45-55°C | p. 221 |
| Hydraulic hose and tube cork dimensions (Nominal 06) | 6 mm (D), 5 mm (d), 8 mm (L) | p. 467 |
| Hydraulic hose and tube cork dimensions (Nominal 10) | 10 mm (D), 8.5 mm (d), 12 mm (L) | p. 467 |
| PPC Valve Centering spring (for P3, P4) installed load | 55.9 N (5.7 kg) | p. 809 |
| PPC Valve Centering spring (for P1, P2) installed load | 29.4 N (3.0 kg) | p. 485 |
