Before you crack a hose fitting or pull a travel motor, this 630-page Komatsu PC35MR-2 shop manual PDF (SEBM032411) belongs open on the bench, covering five MR-2 hydraulic excavator variants from the PC27MR-2 to the PC50MR-2. Troubleshooting fills nearly a third of the book. It is split into electrical E-mode, hydraulic and mechanical H-mode, and monitor panel M-mode checks for travel deviation, swing performance, hydraulic drift and engine start failure. Structure, Function and Maintenance Standard is the largest section and walks through swing machinery, track frame and control valve. The back of the manual carries hydraulic and electrical circuit diagrams for tracing a fault from pump to cylinder. Run track shoe bolts on the PC27MR-2, PC30MR-2 and PC35MR-2 to 130 to 145 Nm, and a 22 mm flared hose nut to 78.5 ± 19.6 Nm. Guess wrong and you pay twice: new hose, second teardown. Bookmarks and a live text layer take you to the right E-mode or H-mode table in seconds.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| General | 27-60 | Specification Dimension Drawing, Working Range Drawing, Specifications, Weight Table, Lubricants, Fuel and Coolant Specifications |
| Structure, Function and Maintenance Standard | 61-269 | Cooling System, Swing Machinery, Track Frame, Control Valve |
| Standard Value Tables | 270-295 | Engine Related Parts, Chassis Related Parts, Performance of Hydraulic Pump, Machine Posture for Performance Measurement |
| Testing and Adjusting Procedures | 296-355 | Engine Speed Measurement, Exhaust Gas Color, Valve Clearance, Compression Pressure, Alternator Belt Tension, Air Conditioner Compressor Belt Tension |
| Troubleshooting - Electrical System (E-Mode) | 356-447 | Troubleshooting Sequence, Wiring Harness Handling, Fuse Box Connection, Engine Start Failure, Windshield Wiper, Air Conditioner |
| Troubleshooting - Hydraulic and Mechanical System (H-Mode) | 448-483 | Work Equipment Speed/Power, Travel Deviation, Swing Performance, Blade Operation, Hydraulic Drift |
| Troubleshooting - Monitor Panel System (M-Mode) | 484-543 | Monitor Panel Self-Check, Alarm Buzzer, Engine Oil Pressure Caution, Charge Level Caution, Coolant Temperature Gauge, Fuel Level Gauge |
| Disassembly and Assembly | 544-618 | Removal and Installation of Fuel Injection Pump Assembly, Removal and Installation of Radiator and Hydraulic Oil Cooler Assembly |
| Others | 619-630 | Hydraulic Circuit Diagram, Electrical Circuit Diagram |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Tightening torque for flared nuts | 24.5 ± 4.9 Nm to 294.2 ± 49 Nm | p. 16 |
| Tightening torque for O-ring boss plugs | 5.88-8.82 Nm to 274.4-367.5 Nm | p. 17 |
| PC27MR-2, PC30MR-2, PC35MR-2 |
| Tightening torque of shoe bolt | 130 – 145 Nm {13 – 14.5 kgm} | p. 86 |
| Hydraulic Tank Capacity (PC27, 30, 35MR-2) | 30L | p. 91 |
| PC27MR-2, PC30MR-2 |
| Main relief valve adjustment screw adjustment amount per turn (PC27, 30MR-2) | 12.6 MPa {128 kg/cm2} | p. 322 |
| PC35MR-2, PC40MR-2, PC50MR-2 |
| Main relief valve adjustment screw adjustment amount per turn (PC35, 40, 50MR-2) | 19.6 MPa {200 kg/cm2} | p. 323 |
| PC40, 50MR-2 |
| Revolving frame assembly mounting bolt torque | 98 – 123 Nm | p. 600 |
| Swing circle assembly mounting bolt torque | 98 – 122.5 Nm | p. 601 |
| PC27MR-2, PC35MR-2 |
| Engine Oil Capacity (PC27, 35MR-2) | 7.7L | p. 59 |
| PC40MR-2, PC50MR-2 |
| Engine Oil Capacity (PC40, 50MR-2) | 8.0L | p. 59 |
