1979 Cub Cadet 86–1650 Chassis & IH Equipment Service & Repair Manual (P/N GSS-1464)

The September 1979 Revision 2 (publication GSS-1464) documents chassis and IH equipment configurations for the International Cub Cadet models listed above, including the transition to self-unloading check valves.

Supplied as a 147-page PDF in English.

• Engine removal: Removal and installation procedures for both model groups, including engine isomount positioning and snubber-mount clearance checks.

• Gear-drive repair: Clutch service, tractor splitting and recoupling, reduction-drive overhaul, transmission disassembly, differential setup and creeper-drive repair.

• Hydrostatic drive: Charge-pump and transmission overhaul, check-valve troubleshooting, pressure testing and speed-control linkage adjustment for tractors with or without hydraulic lift.

• Steering and brakes: Steering assembly overhaul, front and rear axle service, wheel bearings, internal brakes and external disc-brake adjustment.

• PTO and electrical systems: Mechanical and electric front PTO clutch service, rear PTO repair, model-specific wiring diagrams and safety-starting-switch adjustment.

• Power lifts: Electric-lift troubleshooting and slip-clutch adjustment, plus hydraulic pressure checks and single- and double-spool control-valve service.

• IH equipment: Mower spindle service, blade sharpening, deck leveling and belt adjustment, with snow-thrower gearbox and International 1A rotary-tiller coverage.

The overhaul sections suit mechanics and experienced owners with transmission-repair skills and access to a press and hydraulic test equipment.

Engine and Chassis Coverage

Engine coverage is limited to removal, installation and related mounting adjustments. Internal engine overhaul, fuel-system repair, cranking-motor and generating-system service belong to the separate GSS-1465 manual, which is not included.

Steering procedures cover cam-follower wear and adjustment; wheel and axle sections include bearing end play and toe-in. Brake procedures distinguish standard-transmission and hydrostatic layouts, including hydrostatic tractors with a disconnect package.

Transmission and Hydrostatic Repair

Gear drive: Differential setup covers carrier-bearing preload, shim selection, bevel-gear backlash and tooth-contact patterns. Creeper-drive cross sections identify the planetary assembly and shifting components, while service instructions address its separate lubrication compartment.

Hydrostatic diagnosis: Separate procedures address no movement or slow travel with manual-unloading and self-unloading check valves. The serial-number breaks help select the appropriate fault checks before investigating a check-valve or charge-pressure problem.

Internal service covers pump and motor valve-plate identification, piston/slipper inspection and swash-plate work. Cam-bracket adjustments address neutral creep. The manual warns that driving coupling pins without supporting the drive rod can damage the charge pump.

The Hydrostatic Transmission External Brakes illustration traces oil flow alongside the drive and brake controls.

PTO, Wiring and Power Lifts

Mechanical front PTO clutches are covered with and without brakes, including adjustment with the gauge supplied in the clutch-disc repair kit.

Electric PTO guidance distinguishes the shim-adjusted clutch from the later fixed-air-gap version and includes a problem/cause/test chart, field-coil checks and brake adjustment.

Rear PTO inspection addresses the shaft, bearings, splines and shifter clutch. Separate tractor wiring diagrams and the Electric Lighting and Electric Lift schematics show circuit connections and wire colors.

Electric-lift repair extends to the screw, translating tube, spiroid gear and brake springs. Hydraulic-lift procedures cover charge-pressure and implement-relief checks and control-valve disassembly, inspection and reassembly. Lift-cylinder service is limited to replacement of hoses, fittings and O-rings at the fittings or cylinder.

Mowers, Snow Throwers and Rotary Tillers

Mower procedures distinguish early spindle end bolts from later threaded spindles and hex nuts. Belt-adjustment coverage separates 38-, 42- and 48-inch mowers from the 44- and 50-inch designs.

The International 1A rotary-tiller section covers left/right tine placement and timing. Snow-thrower and tiller gearbox sections describe bearing and gear arrangements; the tiller instructions also address oil-seal replacement.

Service Specifications and Safety

Technical sections provide standardized torque values for nuts, bolts, and hydraulic fittings in both foot-pounds and Newton meters. Reference data also covers clutch-spring dimensions and test loads, hydrostatic pressures, electrical test values and differential setup tolerances.

Before maintenance or adjustments, review the manual's safety rules for tractor support, accidental starting and pressurized hydraulic lines.

File Format and Readability

The total comprises 146 manual pages plus one DealerNation cover sheet. The manual portion includes the original covers, hydrostatic illustration and one blank page; these are already included in the total.

Text search: An existing OCR layer makes much of the service text searchable, but some pages and diagram labels are not searchable.

Navigation: Embedded bookmarks link to the contents, Engine, Chassis and IH Equipment sections.

Wiring diagrams: Small terminal letters and wire-color labels require zooming; some switch lettering remains soft.