1986 John Deere 550A Bulldozer & 555A Loader Technical Manual

1986 John Deere 550A & 555A Technical Manual (TM-1292)

When a machine is down, guesswork costs money. This 896-page OEM technical manual (TM-1292) is the definitive shop reference for the 1983–1986 John Deere 550A Crawler Bulldozer and 555A Crawler Loader. It delivers the exact factory specifications required to troubleshoot, tear down, and rebuild critical systems. Available as an instant PDF download, you get the data you need the second you check out.

• Complete Series Coverage: Details the 550A and 555A, including 6405, 6410, and 6415 dozer blade configurations and various loader setups.
• Shop-Ready Resolution: High-quality formatting preserves fine-line detail. Print exactly the schematics you need and take them straight to the bay without worrying about ruining an expensive bound book with grease.
• Visual Teardown Guides: Features 83 exploded-view mechanical diagrams and 12 component assembly illustrations.
• Core System Specs: Comprehensive documentation covering engine, chassis, electrical, track, and hydraulic systems.

Component Breakdown & System Documentation

Professional maintenance demands hard data. This manual maps out over 90 equipment groups to guide you through complex repairs. You will find the exact factory procedures for track chain removal, sprocket replacement, final drive overhauls, and steering clutch service.

Need to drop fluids? The maintenance sections feature precise specification charts for engines, transmissions, winches, and final drives, fully matched to temperature-based viscosity recommendations. The resource also establishes the baseline metrics for gear shaft preload, torque converter servicing, and hydraulic pressure testing across all variants.

Technical Specifications & Wear Limits

Deep mechanical work requires uncompromising accuracy. Expect extensive technical reference points throughout, including specific torque values for Grade B, D, and F hardware. For example, final drive housing cap screws are torqued to 240 ± 24 lb-ft (325.4 N·m).

Inside the engine chapters, you will see intake valve clearance charts, while the undercarriage sections clearly define wear limits for bushings and links to help you decide when to swap parts. Gear-to-shaft tolerances and clutch pressure values are extensively documented.

Working on heavy iron involves immense physical forces and high-pressure hydraulics. Always verify proper cribbing and refer to the complete OEM safety protocols within this manual before turning wrenches, as the specifications highlighted here serve as a content preview rather than step-by-step repair instructions.