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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Document Details

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Document Number / Seller:
23757 / Sharon Miller
File Size:
55.86 MB
File Type:
PDF
Language:
English
Pages:
947
Printable:
Yes
Category:
Mini Excavator
Last updated / verified
Jan 11, 2026

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.

Manual Description & Preview

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

FAQ

What values must the **calibrated** engine system maintain during operation? keyboard_arrow_down

2,785 ± 50 rpm is required for high idling speed on PC27MRX-1 models to ensure proper system architecture and performance.

Assess the **applicable** tool requirements for work equipment pressure testing. keyboard_arrow_down

39.2 MPa {400 kg/cm²} gauge capacity is required for measuring boom, arm, bucket and other work equipment relief pressures during diagnostics.

What components contain the **exact** electrical values for solenoid operation? keyboard_arrow_down

2.94 +0.49 -0.1 MPa {30 +5 -1 kg/cm²} output pressure from the PPC lock solenoid valve is the specified electrical circuit value for proper equipment lockout function.

Confirm the **specific** calibration settings required for swing motor operation. keyboard_arrow_down

18.0 +0.49 -0 MPa {184 +5 -0 kg/cm²} relief pressure is the mandatory setting for swing motor safety valve to prevent damage during maximum load conditions.

What tools are **designated** for measuring hydraulic cylinder internal leakage? keyboard_arrow_down

10 cc/min maximum leakage rate must not be exceeded when measuring internal clearance of boom, arm, and bucket cylinders at 45-55°C oil temperature during troubleshooting procedures per manufacturing specifications.

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