1959 Oliver OC-4 Gas Crawler Tractor Parts Manual (P/N S6-9-102A)

This Oliver OC-4 gas crawler tractor parts catalog reproduces Form No. S6-9-102A, Final Edition April 1959. It identifies assemblies, individual parts, and required quantities for the tractor and listed attachments. It supports repair planning and parts identification; it does not provide step-by-step overhaul, adjustment, or troubleshooting procedures.

• Engine components: Illustrated listings for the cylinder block, crankshaft, connecting rods, pistons, valve gear, lubrication system, water pump, and cooling connections.

• Fuel and ignition: Carburetor, fuel pump, magneto, spark plug, throttle, and governor listings, with equipment-specific alternatives and related service kits.

• Clutch and transmission: Clutch release components, drive and pinion shafts, gears, shift controls, bearings, seals, and assembly-specific hardware.

• Steering and final drive: Differential illustrations, steering brake bands and controls, rear wheel drives, spacer plates, bearing retainers, and trunnions.

• Undercarriage: Track frames, lower wheels, front wheel supports, guide supports, rock guards, track linkage, and grouser applications.

• Electrical equipment: Starting motor and generator component lists, voltage regulator parts, hourmeter connections, instrument panel equipment, lighting options, and a wiring diagram.

• Attachments and variations: Power take-off and pulley components, drawbar and tow hook parts, tool bar equipment, and KD fuel configuration listings.

Suited to mechanics and experienced owners who can interpret illustrated parts lists and match components to the equipment fitted to their tractor.

Engine, Fuel, and Cooling Components

The Connecting Rod and Piston illustrations separate complete assemblies from their individual service parts. Engine listings distinguish cylinder heads and related components for kerosene and high-altitude configurations.

Vortox air cleaners, Marvel-Schebler carburetors, A.C. fuel pumps, and the Wico XH-1113 magneto are identified alongside their associated parts. Cooling coverage includes the radiator, thermostat, hoses, water pump, and fan drive, while the KD fuel section identifies the auxiliary gasoline tank, shutoff valve, and fuel lines.

Transmission, Differential, and Final Drive

The Upper Drive Shaft and Gears views and Differential assembly illustration show the relationship between gears, bearings, spacers, and retaining hardware. The ring gear and pinion shaft are listed as a set, with an explicit note that they are serviced together.

Final Drive Plates 1-A and 1-B distinguish gauge-specific spacer assemblies, drive shafts, rear wheel bearings, and seals. Those application notes help match replacement parts to the tractor's configuration before ordering. Steering brake linings, cams, and lever linkages have their own listings.

Packaged service kit schedules itemize engine overhaul gaskets, transmission seals, final drive seals, and steering linings. The final drive gasket and oil seal kit covers one side.

Track Frames and Equipment Differences

Track Linkage illustrations identify links, pins, bushings, and hookup parts. Application and quantity notes distinguish track frames with three or four lower wheels, along with dirt, ice, shallow-dirt, street plate, and rubber tread options.

Guide-support replacement notes refer to separate Service Bulletin CL-664 for installation instructions. The tool bar section lists its hydraulic power pack as a complete assembly; it does not break down the internal pump or valves.

Main frame and body listings cover the fuel tank, seat, hood, and fenders; main spring assemblies and radiator parts include configuration-specific entries. Heavy undercarriage and spring work requires suitable support and the appropriate service instructions.

Wiring, Instruments, and PTO Equipment

The electrical starting and lighting wiring diagram traces the battery, starting switch, generator, voltage control unit, magneto ground circuit, and lamps. Delco-Remy cross-reference numbers accompany the starter and generator parts lists.

Hourmeter and instrument panel listings identify the related switches, gauges, and connections. PTO and pulley illustrations show the drive, driven, and pulley shafts with their gears, bearings, seals, and shift mechanism. The alphabetical reference and numerical parts index provide alternative ways to locate these assemblies.

Selected Bearing and Shim Sizes

These examples represent a small selection of the catalog's component-size listings.

Connecting-rod bearings are listed in standard size and .020-, .040-, and .060-inch undersizes, with separate part numbers.

The final drive list distinguishes .005- and .012-inch rear wheel bearing shims from pinion-shaft bearing-retainer shims listed at .005, .007, and .010 inch. These are replacement-part sizes, not running-clearance specifications or a shim-selection procedure.

PDF Search, Diagram Detail, and Page Count

Search and drawing access: PDF text search and embedded bookmarks are not available. Use the printed indexes to locate sections. Small wiring labels are readable with zooming; rotating the wiring page makes its labels easier to follow.

One printable 102-page PDF contains 101 pages of catalog material, including its factory covers, indexes, and notes pages, plus one added title page. That title page is already included in the total.