1986 John Deere 550A Bulldozer & 555A Loader OEM Technical Manual (P/N TM-1292)

This 896-page John Deere technical manual PDF is publication TM-1292 (November 1986) for the 550A Crawler Bulldozer and 555A Crawler Loader. John Deere states that the book was planned and written for experienced service technicians, and its repair depth reflects that: component removal, teardown, inspection, assembly, adjustment, and machine-level diagnosis are presented as shop procedures rather than introductory training.

• Document identity and machine coverage: Covers the 550A crawler dozer and 555A crawler loader, with general specifications, lubrication data, hardware torque charts, system testing, special tools, and a component index.
• Undercarriage and steering-clutch repair: Details track-chain removal and press work, sprocket and track-frame service, carrier rollers, front idlers, recoil springs, hydraulic track adjusters, wear measurement, final-drive overhaul, bearing preload, steering clutches, and brake bands.
• Powertrain overhaul procedures: Includes torque-converter and power-shift housing teardown, forward/reverse and range-clutch service, countershaft and bevel-drive work, ring-and-pinion setup, transmission pump repair, and control- and selector-valve service.
• Engine and electrical shop work: Covers engine removal, crankshaft, pistons, liners, timing gear train, cylinder head, fuel-injection timing and bleeding, turbocharger, starting motor, and alternator repair, backed by circuit tests and an electrical schematic.
• Working-equipment configurations: Provides dedicated procedures for 6405, 6410, and 6415 dozer blades, loader and multi-purpose buckets, lumber or pulpwood forks, loader boom and return-to-dig linkage, plus their pumps, valves, cylinders, and frames.
• Attachment and diagnostic coverage: Includes separate 9300 and 9550 backhoe sections, winch drive and hydraulics, ripper, log arch, and drawbar service, along with engine, powertrain, hydraulic, electrical, track, backhoe, and winch troubleshooting and test procedures.

Factory Specifications and Variant-Specific Data

Specifications are placed with the repair groups where they are used. The manual supplies component torque tables, fluid capacities and lubricant recommendations, bearing and gear clearances, clutch and spring checks, engine wear limits, track measurements, electrical test data, and hydraulic pressure, flow, efficiency, and cylinder-drift specifications. The general hardware section also distinguishes Grade B, D, and F fasteners.

Configuration differences are handled directly. The 6405 uses its own angling frame, mounting frame, and C-frame procedures, while the 6410 and 6415 share boom-and-lift-frame coverage but retain model-specific blade removal instructions. System Testing separates loader and dozer torque-converter data, includes both lever-steer and pedal-steer clutch/brake adjustments, and provides a hydraulic pump flow-analyzer test identified for the 555A only. The 9300 and 9550 backhoes receive separate frame, control-valve, and cylinder repair sections rather than a single generic attachment chapter.

Diagrams, Test Charts, and Service Tools

Diagnostic illustrations include the Electrical System Schematic Diagram, Wiring Harness Layout, Power Train Block Diagram, Loader Hydraulic System Operation, Dozer Hydraulic System Operation, and the 9300/9550 Backhoe Boom Power Circuit Oil Flow view. These are supported by component-location drawings, pressure-test-port identification, operational checkout modules, malfunction charts, and exploded assembly views throughout the repair groups.

Special tools are identified by number and use at the beginning of the applicable groups. Examples include the D-01030AA Master Pin Pusher, JD284 Hydraulic Track Adjuster Service Set, JD-292 Torque Converter Box Wrench, and JDE-147 Manifold Pressure Tester. Section 99 adds illustrated shop-fabrication information for tools such as the final-drive housing lifting tool, sprocket-weight lifting tool, winch lifting tool, and 9300 backhoe swing-cylinder removal bar.

Important Scope and Repair Cautions

This technical manual assumes established shop skills and equipment. John Deere's companion Fundamentals of Service manuals carry the basic theory and training material. TM-1292 covers fuel-injection pump removal, installation, timing, system bleeding, and line/nozzle service, but refers complete Roosa Master pump and nozzle repair and testing to separate publication TM-1214.

The cautions are component-specific. Hammering out the track master pin can enlarge the link bore and force replacement of the link, while allowing the injection-pump outlet fittings to turn during line removal can damage the pump internally. Work involving suspended components, raised equipment, batteries, diesel injection, and high-pressure hydraulics requires the supports, isolation steps, tools, and OEM safety practices specified in the manual.