Komatsu PC27-45MRX Excavator Shop Manual 965 Pages
PC27MRX–PC45MRX service documentation with complete hydraulic system, engine specifications, and component rebuild procedures. Document ID: SEBM016808
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Models Covered & Key Technical Specifications
Komatsu PC27MRX-1, PC30MRX-1, PC35MRX-1, PC40MRX-1, PC45MRX-1 (11574+, 10001+, 3930+, 1001+, 1001+) — 2003 Applied Professional Repository | MRX Series Catalog.
- Calibrated Displacement Data: 1.490 liters (1,496 cc) is measured at the 3D84E-3 engine cylinder volume Specifications.
- Factory Power Output: 20.6 kW at 2,500 rpm represents the maximum rated horsepower Framework for PC30MRX-1 configuration.
- Primary Torque Specification: 85.3 N·m (8.7 kgm) at 1,800 rpm is established at peak crankshaft output Norms.
- General Hydraulic Capacity: The main control valve requires 26.3 ± 0.49 MPa (268 ± 5 kg/cm²) relief pressure set for standard operation Logic.
- Essential Operating Temperature: Cooling water temperature reaches maximum 120°C (248°F) for optimal engine performance Parameters.
- Operational Track Tension: The undercarriage assembly produces 9.3 rpm swing speed for standard boom swing operation Bounds.
Professional Workshop Service Manual & Technical Specifications
Reference-Grade Safety Technical Manual: Mini Excavator Complete Komatsu PC27MRX Excavator Shop Manual (SN 11574+) (926 P.) | Pro Service File Service-Dossier
Diagnostic-Area: PC27MRX–1, PC30MRX–1, PC35MRX–1, PC40MRX–1, PC45MRX–1 Series (SEBM016808) // Technical-Scope: Hydraulic system architecture, engine configuration, and work equipment logic // Engineering-Base: Comprehensive factory documentation covering 947 pages of technical specifications and service procedures.
Engineering chapters address engine and transmission systems, calling for swing and travel assemblies, while containing boom and arm hydraulic configurations. The document encompasses fuel system data, cooling logic specifications, and lubrication architecture for the complete 3D82AE-3, 3D84E-3, and 4D84E-3 engine platforms. Hydraulic schematics are included for the complete closed-center load sensing system (CLSS) with variable displacement piston pump and multi-stage pressure compensation valve network. Steering component information is provided for the travel motor assembly, swing machinery architecture, and final drive transmission systems across all model variants. Assembly instructions are detailed for swing motor brake actuation, hydraulic cylinder rod seal replacement, and center swivel joint slipper seal installation procedures. Inspection guidelines are provided for track shoe tension adjustment, sprocket wear measurement using gauge alignment, and swing circle bearing inspection protocols. Alignment specifications are included for fuel control lever positioning, boom swing pedal travel calibration, and work equipment control lever stroke standardization.
The manual documents torque specifications for mounting fasteners, seal head assembly bolts, and hydraulic component connections to ensure proper assembly integration. Reference chapters include electrical wiring diagrams for all five model configurations, connector pin allocation drawings with male and female housing configurations, and machine monitor system displays covering coolant temperature gauges, fuel level sensors, and caution lamp circuits. Complete structure information identifies 12 major system chapters including general assembly data, engine control circuits, hydraulic piping layouts, valve control schematics, and troubleshooting flowcharts organized by electrical, hydraulic, and mechanical failure modes.
| Metric | System-Path | Calibration-Data |
|---|---|---|
| Engine Architecture | 3D82AE-3 / 3D84E-3 / 4D84E-3 Framework | Specifications documented in dedicated engine chapter |
| Hydraulic Capacity | Fuel tank: 44 liters; Oil pan: 5.3–7.2 liters | Complete capacity tables provided |
| Performance Data | Boom reach: 5,300 mm; Digging force: 28.5 kN | All specifications in working ranges section |
| Travel Parameters | Speed range: 2.6–4.6 km/h across gear ratios | Load-sensing system controls documented |
| System Integration | Swing machinery reduction ratio: 8.09–7.8 | Wiring and hydraulic interconnection diagrams included |
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