International Harvester Farmall Tractor Shop Manual, 1939–1968 — A/B/C, Cub, H/M/MTA, 4/6/W6TA/9

I&T shop manual for International Harvester and Farmall wheel-type tractors in Series A, B, C, Cub, H, M, MTA, 4, 6, W6TA, and 9. Super and non-Super models are distinguished, along with gasoline, distillate, LP-gas, and diesel configurations.

PDF Search, Bookmarks and Page Layout

Search and navigation: Technical chapters have an OCR text layer, with recognition errors in some model names and tables. Embedded bookmarks cover the main systems, although some subsection links open within related material. Small illustration labels benefit from zooming, and watermarks cross portions of some illustrations.

English-language download supplied as one printable PDF with 88 pages, including one added cover page and 87 manual pages.

Engine, Drivetrain and Hydraulic Service

The selected topics below outline the repair coverage. Further sections address governor friction controls, delayed-lift valves, and drop-retarding valves.

• Engine repair: Engine removal, tractor splitting, cylinder-head and valve service, timing gears, camshafts, pistons, sleeves, crankshafts, bearings, and oil pumps.

• Fuel systems: Carburetor and governor service, LP-gas regulator repair, diesel troubleshooting, fuel-system bleeding, nozzle testing, and IH injection-pump overhaul.

• Transmission and final drive: Shaft and shifter overhaul, torque-amplifier repair, bevel-gear setup, differential service, and rear-axle work.

• PTO and belt pulley: Non-continuous PTO service, independent-PTO reactor-band adjustment, planetary rear-unit overhaul, and belt-pulley gear setup.

• Hydraulic lift: Touch-Control, H/M Lift-All, and MTA/W6TA pressure testing, pump service, control-valve repair, bleeding, and cylinder overhaul.

• Steering and brakes: Front-axle and steering-gear repair, high-clearance axle arrangements, and band- or disc-brake service.

• Cooling and ignition: Radiator, fan, thermostat, and water-pump service, plus battery-distributor and J4/H4 magneto installation, timing, and repair data.

Suited to experienced tractor mechanics comfortable with internal engine measurements, tractor splitting, and component setup.

Model and Build Differences

The manual is organized by tractor series and component design. Table A identifies model groups and serial-number locations, including early and late Super HV, Super MV, and Super MDV builds. Other sections distinguish crankshaft designs, H4 magneto timing, and Series 9 PTO construction.

Those distinctions matter when selecting the correct drawing, timing reference, clutch data, shaft arrangement, or bearing specification.

Engine and Fuel-System Repair

The engine material extends beyond routine tune-up work. It details valve-seat and guide service, valve rotators, timing-gear installation, piston and sleeve inspection, connecting-rod and main-bearing work, rear-seal replacement, and oil-pump repair.

Fuel coverage distinguishes Carter, Marvel-Schebler, Zenith, and International Harvester carburetors. Separate material addresses the F8 gasoline-starting carburetor used on diesel engines and the Ensign XG carburetor and Model W regulator used on Super M and 6 Series LP-gas tractors.

Diesel injection: The section concentrates on the later IH Type A system. Type B pumps are treated as similar except for the absence of a scavenging pump; earlier American Bosch and old-style IH pumps do not receive separate full overhaul procedures. Complete pump and nozzle overhaul requires dedicated testing equipment.

The troubleshooting chart and on-tractor checks connect running symptoms with fuel-supply, nozzle, and pump faults. Component procedures cover the primary and scavenging pumps, plunger, distributor block, camshaft, and governor.

Illustrations include the Series 9 engine section in Fig. IH319 and the diesel starting-system linkage in Fig. IH382. Tool references include dry-sleeve puller SE 1213 and precombustion-chamber puller 1 020 233 R91.

Torque Amplifier, PTO and Hydraulic Diagnosis

The torque-amplifier section explains coordinated engine-clutch and TA-clutch adjustment, clutch-carrier removal, and planetary and over-running-clutch overhaul. Independent-PTO procedures distinguish the drive, driven, extension, and coupling shafts from the planetary rear unit.

Fig. IH427B shows the exploded Super MTA/W6TA torque amplifier; Fig. IH489 sections the independent-PTO installation. Related tools include OTC dummy shaft ED-3259 and PTO puller ED-3262.

Reassembly cautions: Matched TA planet gears and their indexing marks prevent uneven gear loading that can damage the gear set. Marked clutch-carrier and back-plate parts also have a specified balance relationship.

Hydraulic checks distinguish pump faults from relief-valve, control-valve, and cylinder leakage before units are removed. Coverage includes reservoir work, power cylinders, Touch-Control stop-clip adjustment, and cylinder/valve-block overhaul. Fig. IH490A shows the pressure-test arrangement; Fig. IH525 explodes the Cub cylinder and valve unit.

The Touch-Control chapter warns that running the pump without its oil supply after cylinder-block removal can quickly ruin the pump.

Cooling, Ignition and Shop Reference Data

Cooling coverage distinguishes thermo-siphon and pump-circulated systems. Electrical content focuses on ignition-system repair: battery distributors, J4 and H4 magnetos, timing marks, advance and lag tables, and component views. Full tractor wiring diagrams are not included.

Service tables provide model-specific torque specifications, journal and crankpin dimensions, bearing and camshaft clearances, piston/sleeve/ring wear limits, spring tests, fluid capacities, clutch setup data, and bevel-gear contact and backlash information.

Tractor-splitting procedures call for secure support of both chassis sections. Hydraulic chapters stress cleanliness and controlled pressure testing, and the nozzle section warns that diesel injection spray can penetrate skin.

Examples of Valve-Clearance and Hydraulic Test Data

Valve service data lists a tappet gap of 0.013 in., checked cold, for the Cub. The Series A/B/C setting is 0.014 in., checked hot.

With hydraulic oil at operating temperature and the control in the raise position, the Super MTA relief valve unloads at 750–1,000 psi. The Super W6TA value under the same conditions is approximately 1,000 psi.