Komatsu D40A-1, D40P-1, D45A-1, D45P-1, D45S-1 Bulldozer 1978 OEM Shop Manual

• 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
• 966-page original OEM publication (P/N: D40,45.1-BE2) providing exact factory baselines
• Highly visual reference containing 47 exploded-view diagrams and 16 capacity and performance tables
• Explores critical workshop sections including the electrical system, power train, gear pump, testing and adjusting, disassembly and assembly, standard for maintenance, and troubleshooting
• Features essential visual aids like wiring diagrams, general assembly drawings, engine assembly drawings, engine performance curves, engine general views, weight tables, and oil and water capacity charts

Component Breakdown & Workshop Data

Guessing clearances on vintage Komatsu iron leads to costly downtime. This digital PDF 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. By detailing exact turning limits for track link pitches and precise service limits, it provides the specific workshop advantage of allowing you to properly recondition parts instead of blindly buying expensive replacements.

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. Furthermore, it includes precise step-by-step instructions that can save you an expensive trip to the dealer shop, such as track tension adjustment, track roller, carrier roller, and idler oil changes, and the correct replacement of sprocket wheel segments.

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