Oliver 1755, 1855, 1955 Tractors Service Manual (P/N DL-SM-3)

When you are tracking down a hydraulic issue or verifying torque specs, you need fast access to reliable data. This OEM PDF documentation (Publication No. DL-SM-3) delivers 69 pages of consolidated technical specifications for the entire series. Having these factory clearances readily available at the workbench allows you to verify measurements directly during a tear-down, preventing costly reassembly errors and workflow interruptions.

• Covers 1970–1975 Oliver and Cockshutt 1755, 1855, and 1955 tractors, including Rowcrop, Wheatland, and Four-Wheel Drive configurations.
• 119 technical illustrations, featuring 5 distinct exploded-view diagrams specifically isolating the front-wheel drive axle and Hydra-Power drive unit.
• Essential fluid capacities, including the 43-quart transmission volume and 5-gallon cooling system limits.
• Explains vital components such as Saginaw Hydramotor power steering, Roosa-Master injection pumps, Marvel-Schebler carburetors, Holley distributors, and Delco-Remy alternators.
• Provides extensive data for Hydraul Shift assemblies, differential overhauls, independent power take-off (PTO) clutches, turbochargers, transfer drives, and service brakes.

System Breakdown and Component Details

This material maps out the construction of the tractor's major systems. You get a clear look at the engine assembly, cooling system, and electrical components, fully supported by comprehensive factory wiring diagrams for both diesel and non-diesel variants. It also isolates specialized parts for the short wheelbase and four-wheel drive front axles using precise cross-sectional views. Instead of relying on memory during a transmission repair, you can review the exact layout of the clutch assembly, transmission gear train, and the Hydra-Power auxiliary drive.

The hydraulic lift system, remote control valves, and diesel injection pump timing are also detailed, featuring troubleshooting guides and schematic flow charts to support complex diagnostic work. Furthermore, this manual provides the exact step-by-step procedures to handle tasks that typically require a costly trip to a specialized dealership, such as timing the injection pump, bleeding the diesel fuel system, rebuilding the Saginaw rotary valve steering unit, and completely overhauling the power take-off (PTO) clutch and brake assembly.

Critical Tolerances and Specifications

Having the exact tolerances on hand saves significant time during engine rebuilds. The text documents engine cylinder head torque values at 129–133 ft-lbs for non-diesel units, while specifying 180 ft-lbs for specific diesel head bolt patterns.

You will find precise measurements required for machining and adjustments, such as the 0.019–0.021 inch intake valve clearance (non-diesel) and the 0.373–0.374 inch valve guide inside diameter for the spiral groove end on diesel blocks.

In the shop, this data helps you avoid common model-specific repair pitfalls. For example, when reassembling the Saginaw Hydramotor, you must allow the new Teflon drive shaft sealing ring to shrink to its exact size for at least 30 minutes before installing the pump housing; otherwise, seal damage and a sudden loss of steering pressure will occur. Furthermore, never loosen the Roosa-Master injection pump mounting studs while the engine is running to adjust timing via a dynamometer, as this will result in severe internal damage.

Always cross-reference these specifications with your machinery's current condition before applying torque or pressure. Working on heavy tractor drivetrains and high-pressure hydraulic systems carries inherent physical risks, so this material serves purely as a professional reference to support safe, informed maintenance practices by qualified individuals.