2003-2008 Komatsu PC27/PC30/PC35/PC40/PC50MR-2 Service Manual
Complete factory service documentation for Komatsu mini excavators. Covers hydraulic systems, engine specifications, and component procedures. SEBM032406 reference manual (622 Pages)
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Models Covered & Key Technical Specifications
Komatsu PC27MR-2, PC30MR-2, PC35MR-2, PC40MR-2, PC50MR-2 — 2003–2008 Detailed Technical Archive | Hydraulic Excavator Series Repository.
- Calibrated Engine Displacement: 1.330 to 2.189 liters {1,330 to 2,189 cc} is specified as the piston displacement range across all excavator models.
- Prescribed Maximum Torque Output: 83.2 Nm {8.4 kgm} at 1,560 rpm represents the peak crankshaft torque for PC27MR-2 diesel engines Framework.
- Standard Hydraulic System Pressure: 24.5 MPa {250 kg/cm2} maintains the main pump discharge set pressure across all configurations Standards.
- Measured Boom Cylinder Capacity: 552.5 mm stroke length with 75 mm inside diameter establishes the boom actuator displacement Protocol.
- Maximum Digging Depth Performance: 3,800 mm represents the deepest excavation reach for the largest PC50MR-2 model Architecture.
- Nominal Ground Pressure Rating: 28.4 to 36.3 kPa {0.29 to 0.37 kg/cm2} limits the track contact stress on operating surfaces Guidelines.
Professional Workshop Service Manual & Technical Specifications
Professional Hydraulic Manual: Mini Excavator Official Komatsu PC27MR-2, PC30MR-2, PC35MR-2, PC40MR-2, PC50MR-2 Excavator Service & Repair Manual, covers 2003-2008 Calibration-Manual
Model-Designation: PC27MR-2 through PC50MR-2 (2003-2008) // Application-Range: Mini excavator systems / Closed-center load sensing hydraulic configuration // System-Coverage: Engine, hydraulic systems, work equipment, controls, electrical components.
| Document Section | Content Coverage | Reference |
|---|---|---|
| General Specifications | Dimension drawings, working range, bucket capacity, weight table | Complete specifications provided |
| Engine & Hydraulic Systems | Cooling system, power train, hydraulic components layout | See Chapters 01, 10 |
| Control Systems | Solenoid valves, PPC valves, swing machinery, travel motors | Documented with operation sequences |
| Work Equipment | Cylinders, boom, arm, bucket, blade assemblies | Complete dimensions and clearance data |
Maintenance hierarchies are structured into general overviews, hydraulic system documentation, control valve specifications, and work equipment standards, emphasizing the process of identifying component relationships and operational parameters throughout the manual's comprehensive sections.
Reassembly procedures are specified for engine components, hydraulic cylinders, control assemblies, and swing motor units, with detailed torque specifications for fasteners, including head bolts ranging from 412 to 1,067 Newton-meters depending on component size and application. Service intervals are documented for hydraulic oil changes, filter replacement, and hose inspection based on operating hours and fluid degradation monitoring. Component locations are identified for the engine control system, electrical harnesses, hydraulic pump assembly, and load-sensing valve configuration. Service procedures are documented for bleeding air from pumps, cylinders, swing motors, and travel motors following hydraulic system maintenance or component replacement. Calibration requirements are specified for fuel injection timing, engine idle speeds (low and high), valve clearance adjustment at normal operating temperature, and alternator belt tension measured as deflection under finger pressure.
The manual documents torque specifications for the swing machinery bearings to ensure proper preload and smooth rotation without excessive friction resistance.
Maintenance information covers engine performance parameters including compression pressure measurement, fuel consumption ratios, engine oil pressure at various operating speeds, cooling system capacity, and exhaust emissions data recorded as Bosch smoke index values.
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