Komatsu D20A-6, D20P-6, D20PL-6, D20PLL-6, D21A-6, D21E-6, D21P-6, D21PL-6, D20P-6A, D21P-6A, D21P-6B Operation and Maintenance Manual

Komatsu D20 and D21 Series Operation & Maintenance Manual

• Covers 1980s–1990s Komatsu D20 and D21 series bulldozers, including D20A-6, D20P-6A, D21E-6, and D21P-6B variants
• Original Komatsu publication SEAM01010601, dated to the 60001 and up serial number range
• Contains 56 individual maintenance and adjustment procedures supported by 121 pages of technical schematics and illustrations
• Delivered as a direct download the moment payment clears
• Stored against your account so you can retrieve it after a hard-drive loss
• Full-text search finds any part number in seconds
• OCR text layer lets you jump to a torque spec by keyword
• This 121-page reference is the definitive source for operating the Komatsu D20 and D21 series bulldozer, documenting critical lubrication, adjustment, and pre-start inspection parameters.

Operational and Maintenance Coverage

The Komatsu D20 and D21 series operation & maintenance manual provides comprehensive data on daily machine handling, cold weather start procedures, and periodic service intervals. Content details machine locations, instrumentation, control lever functions, gear shifting patterns, and undercarriage care. Further sections break down the lubrication schedule, including point-by-point grease fitting diagrams for the hydraulic tilt dozer and angle-tilt frame components. Maintenance data covers the 50, 250, 500, 1000, 2000, and 4000-hour service intervals, providing explicit guidance for filter replacements, cooling system flushes, and engine valve adjustments for the Komatsu 4D95S-W-1 diesel engine.

Technical Data and Lubrication Reference

Specifications are provided for operating weights, travel speeds, and cooling system capacities. The manual lists specific fuel, oil, and coolant requirements across various ambient temperature ranges. Cylinder head bolt torque values are documented in a multi-stage sequence, with final-stage angles of 180° ± 10° specified in the master link tightening data. Track shoe bolt torque is listed at 7 ± 1 kgm plus an additional 60° ± 10° tightening angle in the inspection section. Hydraulic tank capacity for the D20A-6 is documented at 21 liters. The Komatsu D20 and D21 series bulldozer steering lever travel is specified at 200–274 mm in the adjustment tables. Proper fluid management is vital for longevity, with the maintenance manual structure helping owners plan for seasonal service. Safety note: All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This 121-page Komatsu D20 and D21 series bulldozer manual provides critical operation and service data for the 60001 and up serial number range.