Ford 2600, 3600, 4100, 4600, 5600, 6600, and 7600 Tractor Repair Manual 1975

This 126-page PDF is Ford Motor Company's August 1975 service supplement for the new-series Ford 2600, 3600, 4100, 4600, 5600, 6600, and 7600 tractors. Ford designed it to sit at the front of the contemporary Ford Tractor Repair Manual, so it concentrates on changed designs, new configurations, and model-specific repair data instead of repeating basic procedures that carried over. The material is best suited to experienced mechanics and repair shops equipped for injection-pump bench testing, alternator electrical checks, and hydraulic pressure diagnosis.

• Maps the new model identities from the 2000 to 2600, 3000 to 3600, 3055 to 4100, 4000 to 4600, 5000 to 6600, and 7000 to 7600; Ford lists no direct previous-model equivalent for the 5600.
• Documents engine revisions including circular-port cylinder heads and manifolds, revised combustion-chamber pistons and intake valves, model-specific exhaust valves and inserts, updated head gaskets, injection-pump drive timing marks, and the 7600 twin-entry turbocharger layout.
• Supplies separate distributor-pump bench test plans for the 2600 through 6600, each covering 19 checks from priming and transfer pressure through delivery, governor, shutoff, and timing; separate inline-pump specifications apply to the 7600.
• Covers Motorola charging-system repair with in-vehicle diode, field, regulator, and output tests; alternator disassembly; rectifier, stator, rotor, brush, and bearing checks; bench testing; and troubleshooting.
• Separates the hydraulic configurations for 2600/3600 standard piston or optional gear pumps and increased-capacity transmission-mounted tandem pumps for the 4100/4600 and 5600/6600/7600, including variants with and without Dual Power.
• Details hydraulic repair procedures for lift cylinders and covers, draft/position and flow-control linkage adjustments, valves and color-coded bushings, cooler and filter supports, gear-pump overhaul, pressure testing, and fault isolation.

Supplement Scope and Parent-Manual References

Ford states that the basic service and overhaul methods are largely those of the previous tractors. This supplement is therefore not a stand-alone complete tractor repair manual: it does not replace the parent manual's clutch, transmission, PTO, axle, brake, steering, or general repair chapters. Injection-pump overhaul remains in the parent manual. So do the referenced pressure-test procedures for the 2600/3600 piston pump and 5600-7600 transmission pumps, plus Load Monitor adjustments and lift-cover overhaul. A detailed gauge-and-load-valve test is included for the 2600/3600 engine-mounted gear pump and the 4100/4600 transmission pump. Coverage is defined by model and hydraulic configuration rather than by a stated serial-number range.

Engine, Fuel, and Charging-System Changes

The engine section flags parts that must not be mixed. The new cylinder heads and revised pistons are not interchangeable with earlier designs; Ford 5600 exhaust valves and seat inserts differ from the 6600/7600 parts; and the 7600 twin-entry turbocharger does not interchange with the previous unit. Fuel coverage identifies injector/nozzle assemblies and distributor-pump type numbers for each applicable model, while the 7600 section provides inline-pump timing, delivery, governor, lubrication, and torque data.

Charging-system tables cover hot output, field current and resistance, brush wear and spring tension, and regulator voltage by temperature. Reversed battery polarity or disconnecting the charging circuit while the alternator is running can destroy rectifier diodes or damage the alternator and regulator.

Hydraulic Repair Data and Diagrams

Hydraulic reference data includes lift-cylinder sizes, valve opening pressures, pump outputs, linkage shim data, torque tables, color-coded valve and bushing grades, capacities, and approved oils. Listed service equipment includes T.8510 bushing tools, SW3/SW508 and SW28/6210 setting gauges, and T.8503 or N-1100 pressure-test sets.

The illustrations are functional shop references: Intake Manifold Porting compares the old and new passages; Alternator Components - Exploded View and Rotor Coil Current Draw Test support electrical repair; Hydraulic System - Schematic and Oil Flow for Auxiliary Service trace operating circuits; and Hydraulic Gear Pump - Exploded shows assembly order. Hydraulic fault charts isolate failure-to-lift, slow-lift-under-load, no-drop, and internal-leakage complaints.

During engine-mounted pump teardown, careless housing separation can damage the drive-shaft threads or allow the key to cut the shaft seal. The hydraulic procedures involve high-pressure oil and loaded hitch equipment, so proper supports, isolation, and the specified test equipment are required.