1994 John Deere 655B & 755B Crawler Loader Operation and Test Manual (P/N TM1333)

John Deere Technical Manual TM1333 (05JAN94) covers operation and testing of the 655B and 755B crawler loaders, including Standard and Wide Track configurations with general-purpose or multipurpose buckets.

Text search, bookmarks, and diagram detail: PDF text search is partial because of OCR errors and some diagram pages without searchable text. Embedded bookmarks cover the main sections and individual topics. The smallest wiring labels and wide schematics require zooming.

• Engine testing: Injection-pump timing, fuel-system bleeding, turbocharger boost, compression, valve-lift checks, and cooling-system pressure and radiator airflow tests.

• Hydrostatic drive: Charge-pressure fault isolation, transmission efficiency tests, control-circuit bleeding, injection-pump/control-valve synchronization, and tracking adjustments.

• Loader hydraulics: Pump flow tests, system and circuit relief tests, boom and bucket drift checks, and return-to-dig troubleshooting.

• Electrical diagnosis: Starting, charging, gauge, lighting, and air-conditioning circuits, with wiring diagrams, connector views, and test-point specifications.

• Powertrain and undercarriage: Disconnect-clutch checks, splitter-drive and final-drive diagnosis, track wear measurement, idler adjustment, and sprocket replacement.

• Heating and air conditioning: R12 and R134a recovery, evacuation, and charging procedures, pressure diagnosis, expansion-valve bench testing, and temperature-control switch adjustment.

Written for experienced technicians, this manual assumes access to the diagnostic instruments and service equipment specified for the work.

Diagnostic Scope and Separate Repair Volumes

This volume provides operational checkouts, fault isolation, adjustments, and checks following repair. Full component repair and overhaul require separate publications: TM1478 for the machine, CTM4 for the 6414 engine, CTM8 for the 6068 engine, and CTM11 for engine accessories. Those manuals and the referenced SP326 Undercarriage Appraisal Manual are not included.

Engine Timing, Fuel, and Cooling

Alongside 6068T specifications, the engine group includes 6414T timing data for the 655B. Fuel-delivery checks address the transfer pump and injection system; operating explanations cover the aspirator-equipped air cleaner, turbocharger turbine and compressor, lubrication circuit, and oil cooler housing.

Static timing procedures specify the JDE-81-4 timing pin and JDE-81-1 flywheel turning tool; dynamic timing uses TIME TRAC equipment. Air-filter restriction tests, compression criteria, and valve-lift limits support engine diagnosis. Valve-clearance adjustment is referred to the engine component manual.

Hydrostatic Controls and Mistracking

Charge-system changes: Sections through S/N 731273 cover individual transmission charge pumps and Z-pattern controls. Machines from S/N 731274 use a single charge pump, pressure-side filtration, and U-pattern controls.

The Mistrack Diagnostic Flow Chart and Crawler Does Not Move Diagnostic Flow Chart lead into tests of the brake and bypass circuits, pump and motor displacement control valves, and automatic control valve. Charge- and control-pressure loss procedures help distinguish brake-circuit leakage from transmission-control faults before major components are removed.

Post-repair procedures address initial start-up, neutral-band settings, counterrotation, automatic-control-valve adjustment, and final tracking checks in pump and motor phases. Separate charts address power loss, cycling under load, neutral problems, and overheating.

Loader Pumps, Valves, and Bucket Circuits

Pump variants: Loader hydraulics use an intravane pump through S/N 733242 and a gear pump from S/N 733243.

Control-valve versions: Intermediate sections cover 655B S/N 733243–761834 and 755B S/N 733243–761920. Later valve sections begin at 655B S/N 761835 and 755B S/N 761921, with corresponding relief-valve differences.

The Hydraulic Component JIC Schematic maps the earlier pump-and-valve arrangement. Multipurpose-bucket coverage extends to the clam circuit, double selector valve, and double relief cushion valve, with cycle-time and cylinder-drift specifications.

Electrical Circuits and Test Locations

The Starting Circuit, Charging Circuit, and Air Conditioning and Heater Circuit diagrams show wire codes and connector connections. Serial-specific wiring distinguishes the earlier electrical arrangement from S/N 731274-up systems; charging tests also distinguish the alternator change at S/N 791378.

Circuit test tables pair probe locations with expected readings, including alternator excitation checks. Electrical cautions explain how opening the battery disconnect while the engine runs can damage the charging system.

Track, Final-Drive, and Shop References

Powertrain coverage explains the cold-weather disconnect clutch, splitter drive, spur and planetary final drives, and spring-applied wet-disk park brakes. Undercarriage coverage distinguishes sealed and lubricated track chains, with track-sag adjustment and roller, idler, sprocket, and grouser wear criteria.

Reference tables cover fluid capacities, lubricants, track-shoe and split-master-link hardware torques, and inch/metric fasteners and four-bolt flange fittings. Dealer-fabricated tool drawings include the DSD140284 transmission pump repair stand and DSD130284 motor repair stand.

Observe the manual’s pressure-relief, machine-support, and moving-track precautions during diagnostic work.

Cab Heating and Refrigerant Service

Heater controls, compressor-clutch circuitry, receiver-dryer checks, and leak testing accompany the refrigerant procedures. R12 and R134a have separate component oil-charge instructions. The manual warns that mixing their incompatible oils and service equipment can damage the compressor.

English PDF and Included Pages

A single printable, English-language 588-page PDF: 586 pages from the introduction through the index, one front cover, and one final administrative sheet. Contents pages, section dividers, and blank pages are already included.