Komatsu D20PL-7, D20PLL-7, D20AG-7, D20P-7A, D20PG-7A, D21A-7, D21AG-7, D21PG-7A, D21S-7, D21QG-7, D21A-7T Shop Manual (P/N SEBM001408)
Komatsu Models Covered & Key Technical Specifications
Models: Komatsu D20PL-7, D20PLL-7, D20AG-7, D20P-7A, D20PG-7A, D21A-7, D21AG-7, D21PG-7A, D21S-7, D21QG-7, D21A-7T
Sub-models / Variants: 4D95S-1 engine, 4D94E-1A engine, F2/R2 Transmission, F3/R3 Transmission, Standard track, Rubber shoe spec
Model Years: 2008
Serial Numbers: D20PL-7 62001 and up, D20PLL-7 62001 and up, D20AG-7 75001 and up, D20P-7A 75001 and up, D20PG-7A 75001 and up, D21A-7 75001 and up, D21AG-7 75001 and up, D21PG-7A 75001 and up, D21S-7 61001 and up, D21QG-7 61001 and up, D21A-7T 75001 and up
Technical Data:
- Engine: 4D95S-1 and 4D94E-1A, 4-cycle, water-cooled, in-line vertical, direct injection
- Displacement: 2.69 liters (4D95S-1) / 2.77 liters (4D94E-1A)
- Rated Horsepower: 29.4 kW (40 HP) at 2450 rpm
- Transmission: Spur gear (D20-7) or Planetary gear (D21-7), forward 3 speed, reverse 2 speed
- Steering: Dry type, multiple disc clutch, spring boosted, PPC actuated
- Hydraulic Pump: Gear type, discharge 47–59 L/min at 2450 rpm
- Operating Weight: 3,040 kg to 4,710 kg depending on configuration
Komatsu Manual Features & Content Preview
- Covers the 2008 Komatsu D20PL-7, D20PLL-7, D20AG-7, D20P-7A, D20PG-7A, D21A-7, D21AG-7, D21PG-7A, D21S-7, D21QG-7, and D21A-7T bulldozers
- Original OEM publication SEBM001408, February 2008 revision
- Features hundreds of hydraulic circuit diagrams, power train skeleton schematics, and weight specification tables
- 716-page volume providing the technical baseline for 4D95S-1 and 4D94E-1A engine-equipped machines
Technical Documentation Details
This 2008 Komatsu shop manual divides crucial technical data into six main sections built specifically for daily workshop operations. General specs, drawings for rubber-shoe variants, and heavy assembly weight tables lay the groundwork. Need to understand the power train? The structure and function chapters detail power train skeletons, main clutch control, and transmission systems. Testing and adjusting sections document precise pressure settings for hydraulic circuits alongside steering controls. Furthermore, the manual breaks down the exact mechanical order for complex teardowns involving the steering clutch, final drives, and lift cylinder assemblies. Please remember that operating on and servicing heavy equipment carries inherent physical risks; always establish proper workshop safety protocols and relieve system pressure before beginning any mechanical work.
Specification and Reference Highlights
Get precise tightening torque values for standard metric bolts and specialized split flange hardware, documented in both Nm and kgm. Fluid capacities are clearly categorized by ambient temperature ranges. This gives mechanics exact refill volumes for the engine oil pan, transmission case, and final drives. The electrical system section includes a complete wire code table that maps nominal wire sizes directly to current ratings and circuit applications. You also get reference data covering performance metrics for forward and reverse gear ranges under various heavy load conditions.
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