International Cub & Cub Lo-Boy Tractor Operator’s Manual — 1950s–1960s (P/N 1 014 488 R8)

This International Harvester operator’s manual covers operation, lubrication, and preventive maintenance for 1950s–1960s International Cub and Cub Lo-Boy tractors. This edition is Rev. 6 (2-75), P/N 1 014 488 R8.

Printable PDF, Search, and Wiring Detail

Text search and diagram labels: The manual’s interior pages are searchable, with gaps in some diagrams and tables. Search skips the covers and added opening page. Two bookmarks lead to the opening page and front cover. Zoom in to read small terminal labels and reference numbers on the wiring diagrams.

The download contains one printable English-language PDF with 80 pages total: 77 manual interior pages, the original front and back covers, and one added opening page.

Tractor Operation and Routine Service

These are selected topics from the manual. It also covers tractor towing and temperature correction for battery hydrometer readings.

• Engine and fuel system: Carburetor idle adjustment, fuel-strainer cleaning, valve-clearance checks, cylinder-head bolt tightening, and oil-bath air cleaner service.
• Ignition and electrical: Magneto removal and timing, distributor breaker-point service, generator polarization, and wiring diagrams for starting, charging, and lighting circuits.
• Touch-Control and Fast-Hitch: Hydraulic reservoir and strainer service, trapped-air removal, control-stop settings, hitch adjustments, and implement load limits.
• Clutch, brakes, and wheels: Clutch pedal free-travel adjustment, equalization of external-contracting brakes, front-wheel bearing service, toe-in adjustment, and wheel-tread settings.
• Troubleshooting: Cause-and-remedy charts for hard starting, irregular running, power loss, overheating, abnormal oil pressure, electrical faults, and drivetrain problems.
• Lubrication and maintenance: Model-specific lubrication diagrams, fluid-capacity tables, preventive maintenance schedules, cooling-system care, and procedures for storage and return to service.

The manual is suited to owners who operate and maintain their tractors, including those comfortable with routine adjustments using a feeler gauge.

Driving, Cooling, and Minor Engine Service

Daily pre-start checks and break-in instructions accompany guidance on fuel handling and driving with the three-speed transmission. Illustrations show the seat positions and drawbar arrangements for each tractor.

The cooling section explains thermosiphon circulation and distinguishes pressure-type and nonpressure radiator caps. It also covers radiator cleaning, fan and generator belt service, and cold-weather operation.

The engine section gives step-by-step instructions for checking and adjusting valve clearance, plus the tightening sequence after cylinder-head gasket replacement. A tachometer drive installation diagram accompanies instructions for inspecting the drive gear and removing and reinstalling its housing.

The engine procedures cover minor service. International Harvester directs bearing, piston, and ring replacement and valve reconditioning to dealer service. For transmission problems, the manual provides troubleshooting charts and directs internal repairs to a dealer.

Ignition and Electrical Variants

Six starting and lighting diagrams distinguish positive- and negative-ground systems and magneto and battery ignition. The negative-ground battery-ignition diagrams include the flashing warning-light circuit. A separate magneto illustration identifies the firing order.

The wiring diagrams and their reference lists identify regulator terminals, starter connections, instrument-panel wiring, and wire colors. Matching ground polarity and ignition type helps you select the correct diagram before tracing a circuit. The generator polarization instructions explain how reversed polarity can burn the regulator relay contacts.

Touch-Control, Fast-Hitch, and Chassis

The Touch-Control instructions cover setting the lever stops for implement travel. If a raised implement strikes the tractor before the hydraulic cycle is complete, pressure can build, overheating the fluid and damaging the pump.

Fast-Hitch illustrations show the arrangements for each model. Load guidance pairs utility-carrier payloads with front ballast and gives transport limits for a disk harrow and rotary hoe. The individual implement manuals supply equipment-specific operating directions.

Rear wheel-tread charts and front axle illustrations show wheel and rim arrangements and adjustable axle settings. The PTO and belt-pulley section covers operation and changing between the two attachments, alongside safety guidance for powered equipment.

Troubleshooting and Maintenance References

Fault charts pair symptoms with possible causes and remedies, including clutch slip, brake drag, difficult shifting, and steering faults. The charts flag cases for dealer service.

The oil-flow diagram shows why the oil-filter retainer bolt’s metering hole must stay clear. Reference tables give tire loads by inflation pressure and list separate speeds for the PTO shaft and belt pulley.

Sample Touch-Control Capacities and Front-Wheel Toe-In

For Touch-Control service with IH Hy-Tran fluid, the manual lists 3-1/2 U.S. pints after draining as directed and 4-1/4 U.S. pints for a completely dry new or rebuilt unit.

The front axle section gives a front-wheel toe-in target of 1/4 inch (±1/16 inch), measured as the difference between the front and rear rim spacing at hub height.