Farmall H, HV, W-4, O-4, I-4, U-4, and IU-4 Tractors Service Manual (GSS-5032)

This official 67-page International Harvester GSS-5032 factory manual serves as the primary technical reference for the 152 cubic-inch 4-cylinder engine and associated chassis components common to the entire Farmall H and 4 Series product line. Published originally for agricultural equipment division service training, it offers deep technical insights for mechanics, seasoned do-it-yourselfers, and restoration specialists working on these classic machines.

• Covers 1939–1954 International Harvester Farmall H, HV, W-4, O-4, OS-4, I-4, U-4, and IU-4 tractors and power units.
• Documents core mechanical, lubrication, and electrical systems.
• Contains 56 individual specification tables covering engine, transmission, steering, and clutch systems.
• Features extensive cross-sectional diagrams and exploded-view visual references for precise parts identification and assembly.

Covered Systems and Components

The service manual provides highly detailed data spanning the engine, cooling, fuel, and electrical systems. You will find precise cylinder head assembly details alongside piston and connecting rod tolerances. Need to evaluate the bottom end? It thoroughly documents camshaft bearing specifications and magneto timing procedures. Additionally, the text outlines steering gear components, differential assemblies, bevel gear adjustments, and factory-recommended brake maintenance intervals. Working on vintage heavy agricultural equipment presents unique physical hazards. Always review standard shop safety protocols and ensure you understand the mechanical load limits before beginning any diagnostic work or teardown.

Technical Specification Previews

Precise tolerance charts and fluid capacities take the guesswork out of maintenance and complete overhauls. For instance, cylinder head stud torque is strictly specified at 70 ft.lb., while main bearing cap bolts require exactly 75 ft.lb. of torque. Fluid capacities are clearly documented to ensure your restorations meet original factory standards: 6-1/2 gallons for the transmission and differential case, 4-1/4 gallons for the cooling system, and 6 quarts of oil for the crankcase.