Toyota 52-6FGCU33, 52-6FGCU35, and 52-6FGCU45 1997 Forklift OEM Service Manual (PN CU021)

• Model coverage: Toyota Motor Corporation service data for 52-6FGCU33, 52-6FGCU35, and 52-6FGCU45 trucks as documented in March 1997. All three use the GM6-262 engine with torque-converter drive; the general section also shows the frame-number location and identifies the optional 52-6FGCU35BCS compact specification.
• Engine-side work: engine assembly removal and installation; speed inspection and adjustment for gasoline, gasoline/LPG, and LPG-only versions; electronic-governor self-diagnosis and sensor/switch adjustment; LPG air-governor adjustment; ignition-timing and engine-pulse checks; plus air-cleaner warning, cooling, starting, charging, exhaust, and accelerator-pedal service.
• The drivetrain section covers the torque-converter hydraulic circuit, fault diagnosis, transmission cover and control-valve teardown, torque converter and stator/oil-pump service, internal transmission inspection and reassembly, differential carrier repair, hydraulic-pressure measurement, and stall testing.
• Chassis procedures address front and rear axle removal, rear hub/steering-knuckle and axle-cylinder service, hydrostatic steering-valve troubleshooting and overhaul, steering relief-pressure testing, front brake repair, brake-booster overhaul, air bleeding, braking-force checks, and parking-brake and inching-pedal adjustment.
• Material-handling coverage includes natural-drop, forward-tilt, and cylinder leak tests; V, FV, and FSV mast removal and teardown; lift-bracket, chain, fork, roller, and shim adjustment; lift and tilt cylinder overhaul; flow-regulator and safety-down-valve service; oil-pump testing; and oil-control-valve repair.
• Reference support includes periodic-maintenance data, approved lubricants and fluid capacities, component-specific torque tables, hydraulic pressure-test specifications, inspection limits, adjustment data, an illustrated SST list with Toyota tool numbers, hydraulic schematics, diagnostic flowcharts, component views, and GM6-262 wiring diagrams.
• 318 PDF pages across four files: a 294-page 6FGCU33-45 repair manual, a 10-page related-model 6FG10-30/6FD10-30 wiring reference, a 6-page 6FGCU33-45 GM6-262 wiring extract, and an 8-page 6FGU33-45/6FDU33-45/6FGAU50/6FDAU50 wiring reference.

Coverage Boundaries and Model Differences

Toyota separates a number of service standards and component layouts between the 3.25/3.5-ton trucks and the 4.5-ton model. The mast chapters also distinguish V, FV, and FSV assemblies, including model-specific rollers, chain setup, lift-cylinder arrangements, and rod-shim adjustment for uneven lifting. The 52-6FGCU35BCS is identified as a compact-spec option in the general data rather than as a separate full repair chapter.

The engine chapter is chassis-focused rather than a full internal overhaul manual. It documents engine removal, external service, speed and governor diagnosis, and related electrical controls, but directs internal GM6-262 engine repair to Toyota Industrial Equipment GM6-262 Engine Repair Manual No. C4630. That separate engine manual is not included in this four-file set.

Rebuild Depth, Diagrams, and Shop Tools

For deeper drivetrain repair, the manual covers turbine-runner spacer selection, stator one-way-clutch inspection, clutch and transmission teardown, differential carrier setup, ring-gear backlash and tooth-contact inspection, hydraulic-pressure measurement, and stall testing. Hydraulic diagnosis extends to mast natural-drop and forward-tilt tests, lift- and tilt-cylinder leakage checks, oil-pump delivery testing, and oil-control-valve relief adjustment.

Illustration support includes the electronic-governor system circuit and diagnostic flowcharts, the torque-converter hydraulic circuit, transmission and mast component views, oil-control-valve cutaways, and six GM6-262 wiring sheets for gasoline, dual-fuel, and LPG configurations. The SST appendix identifies tools such as Toyota electrical tester P/N 09082-00050, engine unit hanger P/N 09010-20111-71, torque-converter clutch-drum spring remover/replacer P/N 09220-22000-71, and cylinder-cap remover/replacer P/N 09620-10160-71.

The 10-page related-model wiring reference adds battery, starting/charging, fuel and emissions, lighting, accessory, and combination-meter circuits. The six-page 6FGCU extract repeats the GM6-262 appendix sheets as a stand-alone shop reference. The eight-page related-model file repeats those six sheets and adds 13Z 12V/24V diagrams; those diesel pages do not expand the main repair coverage beyond the 52-6FGCU33/35/45 models.

Two manual-specific repair cautions stand out: electronic-governor controller and sensor parts are vulnerable to direct wash pressure and impact, while excessive hydraulic relief adjustment can damage the oil pump and other hydraulic components.

Note: Always relieve hydraulic system pressure and securely disconnect the battery before initiating any teardown procedures to prevent severe workplace injuries or equipment damage.