1987–1991 John Deere AMT600, AMT622, AMT626 All Material Transporter Service Manual (P/N TM1363)

John Deere technical manual TM1363 (15AUG91) covers the 1987–1991 AMT600, AMT622, and AMT626 All Material Transporters. This August 1991 revision adds AMT626 repair and diagnostic information, revised steering-gear coverage, and updated rear-axle installation details.

• Engine service: Engine removal and installation, symptom-based diagnosis, compression testing, valve-clearance adjustment, and fuel-pump testing.

• Transaxle repair: Transaxle disassembly, internal inspection, differential-lock service, shifter repair, and drive-axle removal and installation.

• Clutches and chain drive: Drive pulley overhauls, driven pulley adjustments, drive chain tensioning, belt alignment, and full-upshift checks.

• Electrical diagnostics: Capacitor discharge ignition (CDI) testing, regulator-rectifier voltage checks, stator resistance diagnostics, and wiring diagrams with circuit test points.

• Steering and brakes: Front wheel bearings, steering yoke and fork, steering quadrant inspection, mechanical disc brake service, and cable equalization.

• Hydraulic lift: Optional cargo-box lift pump service, lift-cylinder troubleshooting, hydraulic schematics, and raise/lower relief-valve pressure tests.

The manual is written for experienced technicians and identifies the essential tools required for particular service jobs.

Engine Diagnostics and Repair Scope

Separate diagnostic sections cover the AMT600's KF82D/FZ340D engines and the AMT622/626's FE290D. The former use splash lubrication; the FE290D section covers pressure lubrication and oil-pressure testing with or without the optional oil filter.

The AMT600 intake and exhaust valve-clearance procedure includes a tappet-cap selection table. FE290D coverage adds an automatic compression release (ACR) check. Crankcase pressure/vacuum specifications accompany the engine tests, while idle-mixture, choke, and governor adjustments address running problems.

Carburetor Float and Main Circuit diagrams explain fuel metering. Surging charts include carburetor float checks, with adjustment specified for the AMT600. Fuel-pump coverage includes pressure/flow testing and replacement; the pump is non-serviceable.

Engine repair limit: The engine repair section covers removal and installation. Complete internal engine repair requires the separate CTM5 John Deere K-Series Air Cooled Engines Component Technical Manual, which is not included.

Transaxle, Clutch and Axle Service

Transaxle procedures extend to the input and intermediate shafts, differential, differential-lock shaft, and case inspection. Axle instructions distinguish installations with or without the axle update kit and AMT600 bearing arrangements at S/N 018720/018721.

The manual covers teardown and reassembly of the variable speed drive clutches, with full-upshift and driven-clutch spring-torsion checks for diagnosing slow acceleration and engine lugging. Clutch service identifies the JDM4-A Salsbury Clutch Spring Tool and distinguishes working from backlash ramp shoes.

The belt procedures warn that prying pulley halves apart can damage pulley surfaces or ramp shoes. Repair specifications include transaxle housing fastener torques, wear limits, adjustment data, and fluid capacities.

Steering, Brakes and Hydraulic Lift

Steering-quadrant procedures distinguish the AMT622/626 arrangement through S/N 004349 from the AMT626 arrangement starting at S/N 004350. Brake coverage explains caliper-design changes, matching cable types, and separate equalizer adjustments for hand-lever and foot-pedal controls.

The Hydraulic Lift System Schematic and raise/lower diagnostic charts cover the gear pump, shuttle valve, and check valves. Pump-service notes warn that incorrect relief-valve reassembly can change pressure settings and damage components.

Review the manual's safety instructions before supporting the chassis, working beneath the cargo box, disconnecting the battery ground strap, or opening hydraulic lines.

Operational Checkout and Electrical Fault Tracing

The model-specific operational checkout sections direct starting, drive-engagement, and braking symptoms to the appropriate diagnostic groups. This helps narrow down which system needs testing before components are removed.

AMT600 electrical schematics distinguish machines through S/N W00600X018720 and from W00600X018721 onward. The AMT622/626 Electrical Schematic and AMT622/626 Wiring Harness drawings identify circuit connections and wire codes.

The European Schematic—All Models covers additional lighting and signaling circuits. Wiring coverage also includes the optional hydraulic dump and hourmeter.

CDI resistance charts support AMT600 ignition diagnosis, while FE290D tests cover the ignition coil and module. Starter and wiring-harness replacement procedures accompany common-circuit checks for shorts, open circuits, and poor grounds.

PDF Navigation and Diagram Readability

The printable English PDF has partially searchable text and embedded bookmarks for sections and procedures; diagram-only pages do not support text search. Small wiring labels require zooming, and some faint wire codes remain difficult to read even when enlarged. The 581-page PDF includes one cover page and 41 additional pages of tiled diagram views, all already included in the total.