Komatsu PW20-1 PW30-1 Excavator Shop Manual
Technical reference covering PW20-1 and PW30-1 models with detailed diagrams, specifications, and diagnostic procedures. Ref: SEBM021F0102
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Komatsu Models Covered & Key Technical Specifications
Models: Komatsu PW20-1, Komatsu PW30-1 Build Years: 1990s Serial Numbers: 1001 and up Technical Data:
- Engine model: 3D84-1H (PW20), 3D84-1J (PW30)
- Compression pressure (SAE30 oil): Min. 35 kg/cm²
- Valve clearance (cold): 0.2 mm
- Hydraulic pump delivery rate: 26.3 cc/rev at 2600 rpm
- Engine oil pan capacity: 4 liters
- Fuel tank capacity: 50 liters
- Swing machinery reduction ratio: 63.71
- Travel speed (Forward/Reverse): 1st: 12–14 sec, 2nd: 15.5–17.5 sec
- Standard bolt torque (M6): 13.2 Nm
- Standard bolt torque (M10): 65.7 Nm
- Standard bolt torque (M24): 927 Nm
Komatsu Manual Features & Content Preview
Komatsu PW20-1 and PW30-1 Excavator Technical Documentation
- Covers Komatsu PW20-1 and PW30-1 excavators, serial numbers 1001 and up, featuring the 3D84-1H and 3D84-1J series diesel engines
- Official OEM publication SEBM021F0102, providing factory-level mechanical and hydraulic system specifications
- Contains 230 pages of detailed diagrams, exploded-view assemblies, and lubrication maintenance charts
- Files are available to download to your account within seconds of checkout
- Page spreads stay legible when printed at original size for shop-floor reference
- Includes 12 complete chapters covering engine, power train, steering, hydraulic systems, and electrical schematics
- Features comprehensive tolerance charts and torque specifications for front/rear axles, swing circles, and drive shafts
- Built for professional maintenance of the articulation steering and hydrostatic transmission drivetrain
- This service manual includes the authoritative judgment standard tables necessary for accurate calibration of the PW20-1 and PW30-1 series undercarriage and hydraulic systems
Component and System Documentation
The Komatsu PW20-1 and PW30-1 shop manual provides a clear breakdown of machine architecture through detailed structure and function chapters. The content covers the entire power train, detailing the travel system's conversion of hydraulic power into mechanical drive, including the center swivel joint and axle differential gear assemblies. A dedicated section on the hydraulic system documents standard values for relief pressures, pump delivery, and control valve operations. Detailed assembly and disassembly sections guide the reader through the removal of the engine, swing machinery, and front or rear axle assemblies, supplemented by a comprehensive weight table for safe hoisting of key components.
Specification Highlights
Technical data provided includes specific tightening torques for bolts and nuts, ranging from 13.2 Nm for M6 fasteners to 927 Nm for M24 hardware. The fuel injection timing is specified at 19° before TDC for consistent engine combustion. Intake and exhaust valve clearance is established at 0.2 mm in the cold engine state. Compression pressure for the 3D84-series engines must maintain a minimum of 35 kg/cm². The manual also lists essential lubrication requirements, including an engine oil capacity of 4 liters and a swing machinery case capacity of 1.5 liters. Reference how factory workshop documentation is structured to effectively navigate these maintenance standards for your equipment. An official 230-page Komatsu OEM shop manual covering the PW20-1 and PW30-1 series, documenting engine, power train, hydraulic, and electrical specifications for the 1001-and-up serial number build.
Document Reference: Publication SEBM021F0102, Komatsu OEM
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