1983–1987 John Deere 450D & 455D Technical Manual (P/N TM-1291)

John Deere Technical Manual TM-1291 (Oct-87) covers the 450D Crawler Bulldozer and 455D Crawler Loader in a 906-page PDF. The October 1987 complete revision adds corrected artwork and service text for the steering-pedal configuration. It is machine-specific shop documentation for repair and system testing rather than an operator’s manual; Deere’s separate Fundamentals of Service manuals are referenced for general theory.

• Undercarriage and final drive: Documents track-chain removal, master-pin service, link and bushing work, rollers, upper carrier roller, front idler, recoil spring, hydraulic track-tension adjuster, track alignment, wear measurement, final-drive disassembly, axle-shaft preload, and pinion-bearing adjustment.
• Transmission and steering: Details transmission removal and installation, H-L-R clutch-pack repair, clutch oil pump and valve service, accumulator and shift-valve work, countershafts, ring gear/output shaft backlash and preload, neutral-start adjustment, steering clutches, brake bands, and both lever-steer and pedal-steer adjustment procedures.
• Engine repair: Supports engine removal and internal repair of the crankshaft and main bearings, camshaft and timing gear train, connecting rods and pistons, cylinder liners and block, oiling system, cylinder head and valves, fuel injection pump and nozzles, turbocharger, cooling system, starter, flywheel, and engine clutch.
• Hydraulic systems: Provides pump, control-valve, relief-valve, flow-divider, selector-valve, reservoir, filter, and cylinder repair for loader, bulldozer, winch, and backhoe equipment, with pump-efficiency, flow, relief-pressure, and cylinder-drift testing.
• Machine and attachment coverage: Includes loader buckets, multi-purpose bucket, lumber/pulpwood forks, 6405/6410/6415 dozer blade systems, winch, 1000-rpm powershaft/winch drive, 9300 and 9550 backhoes, ripper, drawbar, log arch, ROPS/cab, frames, guards, and counterweights.
• Diagnostics and diagrams: Adds the seven-step diagnosis method and operational checkout, engine tests, starting and charging fault isolation, H-L-R and steering-clutch diagnosis, and hydraulic troubleshooting supported by electrical and hydraulic diagrams, flow illustrations, and test charts.

Undercarriage, Powertrain, and Steering Repair

The track section goes beyond basic adjustment. It documents chain disassembly and assembly, link-height and pitch checks, bushing-diameter measurement, sprocket and idler wear inspection, roller repair, frame alignment, and crossbar removal. The factory procedure specifically warns against driving the master pin out with a hammer because the link bore can be enlarged. The track-tension-adjuster chapter also warns that high pressure may be present and that pulling the piston from the yoke can damage the scraper seal unless the piston and seal are being replaced.

Powertrain coverage follows the assemblies into the transmission. The manual includes high-range, low-range, and reverse H-L-R clutch work; clutch accumulator and oil-manifold service; ring-gear and output-shaft setup; powershaft/winch-drive service; cooler and filter work; and final operational adjustments. Steering repair includes hydraulic clutch components, brake anchor and band repair, steering-clutch housing service, linkage repair, and the revised pedal-steer information.

Engine, Hydraulics, and Equipment Coverage

The engine chapters support full internal repair, not just removal and tune-up. Inspection procedures cover bearing clearances, journal taper and roundness, camshaft and valve-train measurements, piston and liner condition, cylinder-head service, injection timing components, turbocharger clearances, oil-pump inspection, thermostat testing, and starter bench testing. Component-specific torque specifications, wear limits, clearances, spring data, lubricant information, and assembly checks are placed with the related repair groups.

Loader and dozer chapters include frame and boom removal, alignment, bucket and cutting-edge repair, control linkage, pump and valve overhaul, and cylinder disassembly. Separate groups address 9300 and 9550 backhoes, including boom, dipperstick, swing frame, stabilizers, control-valve sections, anti-cavitation and relief valves, and boom/crowd/bucket/swing cylinders. Winch coverage includes clutch and brake drum repair, gear-train setup, seal testing, free-spool adjustment, and brake-band burnishing.

Diagnostics, Diagrams, and Service Data

A separate system-testing section provides engine compression, oil-pressure, cooling-leakage, fuel-transfer-pump, and boost tests; starting and charging circuit diagnostics; H-L-R transmission and steering-clutch tests; hydraulic relief, pump-efficiency, pump-flow, flow-divider, and drift tests; and machine adjustments such as return-to-dig, loader-boom alignment, track alignment, and winch control setup.

Useful visual references include the Electrical System Block Diagram, Electrical System Schematic Diagram, Wiring Harness Layout, Power Train Block Diagram, H-L-R Transmission Power Flow, and Main Hydraulic System Block Diagram. A dedicated special-tools section supplies fabrication drawings for tools such as the JT38006 Liner Holding Fixture, JT38007 Track Roller Installation Tool, JT38014 Final Drive Housing Lifting Tool, and JT38016 Clutch Housing Alignment Tool.

Because this manual covers pressurized hydraulic circuits, recoil springs, raised loader and backhoe structures, and heavy drivetrain components, the machine must be safely supported and hydraulic pressure released before repair work begins.