All 356 pages of this International Harvester Company B-275 service manual PDF are dedicated to one tractor: the diesel B-275, with its electric glow plugs, heavy-duty dual clutch, constant-running PTO, and eight-forward/two-reverse transmission. You get hydraulic schematics tracing the selector valve and pump circuits, wiring diagrams for the generator, starter, and cold-start system, a troubleshooting chart for isolating faults before the first wrench turn, and page after page of exploded views spanning every system from cylinder head to axle carrier. Torque the cylinder head bolts to 70-75 foot-pounds in sequence; confirm the cut-out relay closes between 12.7 and 13.3 volts before signing off on any charging system repair. Every hour your tractor sits costs money. Grab this bookmarked PDF, search any spec by keyword, and get the factory answer on the first try.
What's Inside This International Harvester Company B-275 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Description and Specifications | Tractor Identification, The Technical Specifications and Torque Data, And an Overview of the Diesel Engine, The Electric Glow Plugs and the Heavy Duty Dual Clutch | |
| Diesel Engine | The Cylinder Head and Valves, The Connecting Rods, Pistons and Rings, The Crankcase and Crankshaft, The Timing Gears and the Lubrication System | |
| Engine Clutch | The Heavy Duty Dual Clutch Removal, Inspection, Relining and Pedal Adjustment | |
| Fuel System | The Air Cleaner, The Injection Pump and Governor, The Injection Nozzles and the Fuel Filters and Bleeding | |
| Cooling System | The Radiator, The Water Pump, The Thermostat and the Fan and Belt Servicing | |
| Transmission | The Gearbox Servicing, The Gears and Shafts, The Shifting Mechanism and the Bearings | |
| Differential | The Differential, The Crown Wheel and Pinion, The Final Drives and the Rear Axle Shafts | |
| Power Take-Off | The Power Take-Off Shaft, The Engagement and the Drive Gears and Speeds | |
| Brakes | The Service Brakes, The Brake Shoe Relining and the Pedal Adjustment | |
| Hydraulic System | The Hydraulic Pump, The Lift Cylinder, The Control Valve and the Draft and Position Control | |
| Electrical Equipment | The Generator, The Starter Motor, The Storage Battery, The Voltage Regulator, The Cold Starting System and the Wiring Schematics | |
| Chassis | The Front Axle and Steering, The Wheels and Tyres and the Sheet Metal and Operator Platform |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder Head Bolts Torque | 70 to 75 foot-pounds | p. 72 |
| Rocker shaft bushing reaming diameter | 1.2510 inch to 1.2495 inch | p. 344 |
| Shim thicknesses for end float between cam and steering shaft | 0.010, 0.005 and 0.0024 inch | p. 345 |
| Brake Linings Thickness | 0.194 to 0.200 in. | p. 231 |
| Cut-Out Relay contacts close voltage | 12.7 to 13.3 volts | p. 301 |
| Cut-Out Relay points open discharge current | 3.5 and 5.0 amperes | p. 301 |
| Front Axle Pivot Pin Diameter | 1.115 to 1.116 inches | p. 331 |
| Front Axle Pivot Pin Bushing Bore (Pressed Into Place) | 1.118 to 1.120 inches | p. 331 |
| Power Take-Off Rated engine governed speed (full load) | 555 rpm | p. 28 |
| Front Wheel Toe-in | 1/4 to 3/8 inch | p. 31 |
International Harvester Company B-275 Common Problems This Manual Covers
International Harvester B-275 steering wheel has excessive play, front end wanders and won't track straight
Check the rocker shaft bushings first: worn bushings are the leading cause of steering slop on this model. Ream replacement bushings to between 1.2495 and 1.2510 inches (page 344). Inspect the end cover shims next; the cam and steering shaft must have zero end float, corrected using the 0.010, 0.005, and 0.0024 inch shims available (page 345).
Manual Section: Steering Mechanism Service p. 341Brakes slip or won't hold on slopes, pedal travels nearly to the floor
Measure brake lining thickness: replace linings worn below 0.194 to 0.200 inches (page 231). If linings are within spec, adjust the linkage nuts evenly on both sides to equalize pedal pull before checking free travel. Clean drum contact surfaces thoroughly if contamination is suspected. Full disassembly and rebuild steps begin at page 235.
Manual Section: Brake Service p. 235Battery discharges overnight or ammeter shows continuous discharge at running speed
Test the cut-out relay at increasing engine speed: the points should close between 12.7 and 13.3 volts. Back the throttle down slowly; points must open when reverse current hits 3.5 to 5.0 amperes (page 301). If the relay sticks or fails to open at that current threshold, remove the control box and follow the electrical adjustment procedure on page 310.
Manual Section: Testing p. 251Hydraulic system lifts slowly or won't hold implement at working height under load
Check the hydraulic reservoir oil level first, then connect a pressure gauge: operating pressure should not exceed 2,250 psi. If pressure reads low, inspect pump gears and bushings per the disassembly procedure at page 252. If the system holds at no load but drops under weight, remove and rebuild the selector valve following the steps on page 257.
Manual Section: Hydraulic Pump Service p. 252Front axle feels loose when rocked side to side, steering wanders and knocks on rough ground
Remove the front axle pivot pin and measure its diameter: the acceptable range is 1.115 to 1.116 inches (page 331). Check the pressed-in bushing bore; it should measure 1.118 to 1.120 inches, giving a pin-to-bushing clearance of 0.002 to 0.005 inch. Replace the pin or bushing if clearance exceeds that range. Full axle removal procedure is at page 349.
Manual Section: Axle Service p. 349Frequently Asked Questions
What is an International Harvester B-275?
The International Harvester B-275 is a tractor powered by a diesel engine that develops 35 flywheel horsepower (stripped) at 1875 rpm. It is equipped with electric glow plugs for cold starting and features a heavy-duty dual clutch for constant-running PTO, allowing the tractor to be stopped without interrupting PTO output.
Does the B-275 require glow plugs to start?
Yes, the International B-275 is equipped with electric glow plugs to assist in cold starting. The cold starting system utilizes these plugs to pre-heat the pre-combustion chamber walls and air, which aids in vaporizing the fuel and raising the combustion area temperature.
What causes the lift cylinder to not lower on a B-275?
If the lift cylinder on a B-275 does not lower, possible causes include an incorrect non-return valve tappet setting or an external obstruction. To remedy this, the non-return valve tappet should be reset as described on page 26, or any external obstruction should be removed. p. 249
What are the replacement specifications for Steering gear drop arm (Pitman) bushings?
If new rocker shaft bushings need to be fitted for the steering gear drop arm, they must be reamed in line to a diameter of 1.2510 inch to 1.2495 inch. The rocker shaft itself should be replaced as a complete unit if worn.
How will I receive this Service Manual?
Instant PDF download. You get the full 356-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this International Harvester Company B-275?
Yes, print as much as you like. The PDF is DRM-free, so print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Does this International Harvester Company B-275 manual include wiring diagrams?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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