1950s–1960s International Cub & Cub Lo-Boy Tractor Operator's Manual (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. The document is marked 1 014 488 R8, Rev. 6 (2-75).

Text search, navigation, and wiring detail: The main chapters have searchable text, with gaps in diagram and table labels. The covers and added opening page are not searchable. Two file-level bookmarks provide access to the opening page and manual cover, without chapter navigation. Small wiring labels require zooming.

• Engine and fuel system: Carburetor adjustment, fuel-strainer cleaning, valve-clearance checks, cylinder-head bolt tightening, and oil-type air-cleaner servicing.

• Ignition and electrical: Magneto removal and timing, distributor breaker-point service, generator polarization, and starting, charging, and lighting wiring diagrams.

• Touch-Control and Fast-Hitch: Hydraulic reservoir and strainer servicing, trapped-air removal, control-stop settings, hitch adjustments, and implement load limitations.

• Clutch, brakes, and wheels: Clutch free-travel adjustment, external contracting brake equalization, front-wheel bearing service, toe-in adjustment, and wheel-tread configurations.

• Troubleshooting: Cause-and-remedy charts for starting problems, irregular running, power loss, overheating, oil pressure, electrical faults, and drivetrain complaints.

• Lubrication and maintenance: Model-specific lubrication diagrams, fluid-capacity tables, preventive maintenance schedules, cooling-system care, and storage procedures.

The manual suits owners familiar with routine tractor maintenance and feeler-gauge checks, while directing major repair work to an International Harvester dealer.

Operational Guidance and Minor Engine Service

Daily pre-start checks, fuel system management, and engine break-in instructions accompany guidance on the three-speed transmission. Model-specific seat positions and drawbar configurations are illustrated.

Cooling-system coverage explains thermo-siphon circulation and pressure/nonpressure radiator caps, plus radiator cleaning and fan/generator belt service. Storage instructions address both laying up the tractor and returning it to service.

The minor-engine section includes cylinder-head gasket tightening guidance and illustrated valve-clearance adjustment. A separate tachometer drive installation diagram accompanies drive-gear inspection and housing removal and installation instructions.

Engine bearing, piston, and ring replacement, along with valve reconditioning, are assigned to dealer service. Full engine and transmission overhaul procedures are outside this operator's manual.

Ignition and Electrical Variants

The electrical chapters distinguish 6-volt positive-ground and 12-volt negative-ground systems, with magneto or battery ignition. Six starting and lighting wiring diagrams cover these configurations, including the warning-light circuit for the 12-volt battery-ignition system.

The diagrams identify voltage-regulator terminals, cranking-motor connections, instrument-panel wiring, and cable colors. Matching these to the tractor's electrical configuration helps prevent using the wrong circuit during electrical repair. The magneto wiring diagram also identifies the firing order.

The generator-polarization section warns that reversed polarity can burn regulator relay contacts.

Touch-Control, Fast-Hitch, and Chassis

Hydraulic servicing distinguishes refill capacity after draining from the capacity of a completely dry replacement unit. Incorrect Touch-Control stop settings can leave an implement against the tractor, overheating the oil and damaging the pump.

Fast-Hitch coverage includes utility-carrier payload/front-ballast relationships, disk-harrow and rotary-hoe transport loads, and model-specific hitch arrangements. Implement-specific operating directions remain in the implement's own operator's manual.

Rear wheel tread position charts and front axle illustrations explain wheel/rim arrangements and adjustable-axle settings. The PTO and belt-pulley sections cover operation and changing between the two attachments.

Follow the manual's safety instructions for PTO equipment, hydraulic pressure, and implement load limits.

Troubleshooting and Service Specifications

Fault tables separate possible causes from remedies and mark conditions requiring dealer repair. They address mechanical, fuel, and electrical symptoms, including clutch slip, brake drag, difficult gear shifting, and steering faults.

Reference tables distinguish PTO shaft speeds from belt-pulley speeds and list engine governor settings, spark-plug gaps, valve-clearance data, fluid capacities, and tire load/inflation data. The diagram of oil flow through the filter accompanies instructions covering the filter element and the retainer bolt's metering hole.

Printable PDF and Included Pages

The single printable, English-language PDF has 80 pages total, including 77 numbered manual pages, two original cover pages, and one added opening page.