1960s-1970s International Harvester 706-21456 Series Tractor Shop Manual

This shop manual covers the listed 1960s-1970s International Harvester 706-through-21456-series tractors, with separate repair information for the applicable diesel, gasoline and LP-Gas configurations.

• Engine repair: Engine removal, cylinder-head service, piston and sleeve inspection, crankshaft bearings, valve-train work and timing-gear alignment.

• Fuel systems and turbochargers: Carburetor adjustment, governor synchronization, LP-Gas regulator testing, injection-pump timing, injector testing and turbocharger overhaul.

• Clutch and transmission: Tractor splitting, clutch service, Torque Amplifier overhaul, speed and range transmission repair, and park-lock linkage adjustment.

• Steering and hydraulics: Steering-wheel slip tests, flow-divider and Multiple Control Valve service, hydraulic lift diagnosis and auxiliary control-valve repair.

• PTO and rear drive: PTO clutch and control-valve service, differential setup, final-drive overhaul, and hydraulic double-disc brake inspection and bleeding.

• Electrical diagnosis: Alternator, generator and starter specifications, magnetic-pulse ignition troubleshooting, wiring diagrams and amplifier test-point illustrations.

This manual suits mechanics familiar with tractor splitting and precision measurements, with access to lifting equipment and the specialized tools required for internal repairs.

Engine Components and Cooling

The engine sections distinguish the D310’s wet cylinder sleeves, the C301’s sleeve-free block and the dry-sleeve arrangements used by the other covered engines. Diesel cylinder-head work also addresses injector-nozzle sleeves and cooling tubes where applicable.

The non-diesel rocker-shaft section warns that releasing its shared cylinder-head bolts can allow the head to lift and damage the head gasket.

Radiator removal, fan service and water-pump overhaul procedures distinguish the different pump and bearing arrangements.

Fuel Injection, LP-Gas and Turbochargers

Gasoline and LP-Gas coverage includes carburetor settings, governor-to-carburetor synchronization and regulator-vaporizer pressure tests.

Injection-pump scope: IH model RD, Robert Bosch and Roosa-Master sections cover removal, installation, timing and engine-speed linkage adjustments. Internal pump service is referred to an equipped diesel service facility. Injector-nozzle inspection, opening-pressure adjustment and leakage testing are covered separately.

Turbocharger overhaul and loaded-engine pressure tests distinguish the Solar TC-3B used on 1206/21206 tractors from the Schwitzer 3LD used on the larger turbocharged models.

Clutch, Torque Amplifier and PTO

Clutch service includes tractor separation, spring-loaded and over-center clutch adjustments, transmission-brake settings and starter safety-switch adjustment.

The Torque Amplifier overhaul identifies the one-way sprag clutch’s installation orientation; reversing it prevents Torque Amplifier operation. Range-transmission coverage adds control-linkage schematics, park-lock adjustment and pinion-depth checks using IH locating tool FES 68-13.

PTO configurations: The 706/756/806/856 series and their industrial counterparts are covered with dual 540/1000 rpm or single 1000 rpm PTO units. The 1206/1256/1456 series and their industrial counterparts use 1000 rpm PTOs only. An exploded dual-speed PTO view supports the clutch, control-valve and anti-creep brake procedures.

Use appropriate protective equipment and securely support the tractor before inspecting pressurized systems or separating major assemblies.

Front Axles, Final Drives and Brakes

Front-system coverage includes tricycle and axle-type arrangements, plus the All-Wheel Drive transfer case, front differential and drive shaft on equipped tractors. Rear-drive sections also address high-clearance final drives.

Shim-pack calculations and instructions to readjust certain bull-pinion bearings after changing differential carrier preload help coordinate rear-drive bearing setup.

Brake service includes pedal and control-valve adjustment, bleeding and internal inspection. Sectional views show the self-adjusters, including the different arrangement used on 1456/21456 models.

Power Steering and Hydraulic Lift Controls

Farmall and International steering-layout schematics show their different cylinder arrangements. Operational tests separate hand-pump, pilot-valve and steering-cylinder faults, with additional checks for the flow divider and Multiple Control Valve.

Hydraulic lift coverage includes draft and position control, linkage adjustment, hitch cycle checks, rockshaft service and auxiliary valve overhaul.

Charging, Starting and Ignition Tests

Electrical sections provide component-specific charging and starter test data. The magnetic-pulse ignition wiring diagram and amplifier test-point views support fault tracing beyond basic distributor timing.

The ignition troubleshooting section warns that accidental shorts or grounds can damage the pulse amplifier.

A Sample of Valve Settings and Ignition Test Data

These examples are a small selection of the manual’s adjustment and electrical test data, alongside its torque tables, fluid capacities and wear limits.

Non-diesel intake and exhaust tappet gaps are specified at 0.027 in. with the engine hot.

On non-diesel 756/2756 and 856/2856 models equipped with magnetic-pulse ignition, the isolated distributor pickup coil has a specified resistance range of 650-750 ohms.

Search, Bookmarks and PDF Page Count

Text search and diagram detail: Searchable OCR text and embedded section bookmarks are included. OCR errors can prevent some word matches. Small ignition-wiring and amplifier-test labels require zooming.

One printable, 105-page English-language PDF contains 103 interior pages plus two added cover pages, already included in the total.