Komatsu D40A-1, D40P-1, D45A-1, D45P-1, D45S-1 Shop Manual
Komatsu D40A-1, D40P-1, D45A-1, D45P-1, D45S-1 shop manual covering engine, power train, and hydraulic systems. Ref: D40,D45
Komatsu Models Covered & Key Technical Specifications
Models: Komatsu D40A-1, D40P-1, D45A-1, D45P-1, D45S-1
Sub-models / Variants: Bulldozer, Dozer Shovel
Model Years: 1978
Serial Numbers: D45A-1 1504 and up, D45P-1 1501 and up, D45S-1 1501 and up, D40A-1 1501 and up, D40P-1 1501 and up
Technical Data:
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Engine model: S4D105-1, S4D105-3
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Engine displacement: 3980 cc (S4D105-1), 4330 cc (S4D105-3)
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Engine configuration: 4-cylinder diesel
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Rated output: 90 PS / 2400 rpm (D45), 80 PS / 2400 rpm (D40)
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Max torque: 32 kg-m / 1200–1400 rpm
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Fuel tank capacity: 210 liters
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Transmission type: TORQFLOW
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Min. turning radius: 2.5–3.0 meters
Komatsu Manual Features & Content Preview
1978 Komatsu D40A-1 to D45S-1 Bulldozer Factory Shop Reference
- Complete technical data for the 1978 Komatsu D40A-1, D40P-1, D45A-1, D45P-1, and D45S-1 fleets equipped with S4D105 diesel engine variants
- Instant PDF download right after checkout—pull it up on your shop tablet immediately or print exactly what you need in standard US Letter or A4
- 966-page original OEM publication (D40,45.1-BE2) providing exact factory baselines
- Highly visual reference containing 47 exploded-view diagrams and 16 capacity and performance tables
- Fully searchable document lets you track down specific part numbers and chassis/engine serial number ranges in seconds
- Permanent access secured in your purchase account—never buy it twice
Component Breakdown & Workshop Data
Guessing clearances on vintage Komatsu iron leads to costly downtime. This digital reference delivers the precise factory specifications heavy-equipment mechanics and DIYers need to accurately evaluate the S4D105 engine, Torqflow drivetrain, and hydraulic control systems. You get direct access to structural data and maintenance standards for the crawler frame, steering case, and gear pump assemblies.
Working on heavy machinery inherently involves massive pinch points and high-pressure hydraulics. Always cross-reference the detailed safety parameters and lift points outlined in this documentation before securing the chassis or starting any major assessments.
Rather than providing basic step-by-step repair tutorials, this file outlines the strict OEM data required for professional overhauls. Mechanics can review detailed exploded views to map out components for turbocharger servicing, fuel injection pump calibration, and critical undercarriage evaluations—including the necessary metrics for track tensioning and sprocket wheel segment replacement.
Essential Engine and Hydraulic Specifications
Having the hard numbers right on the bench makes all the difference for a smooth workflow. The included fluid and performance tables give you immediate access to critical diagnostics data:
- D45A-1 Engine Output: Rated at 90 PS at 2400 rpm
- S4D105-1 Oil Pressure: Pump regulator cracking pressure specified at 3.9–4.4 kg/cm²
- D40P-1 Fuel System: Tank capacity documented at 210 liters
- D45S-1 Cooling System: Requires 35 liters of engine cooling water
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