Ford 2600, 3600, 4100, 4600, 5600, 6600 & 7600 Tractor Repair Supplement (1975)

Ford’s August 1975 repair supplement covers the New Series 2600, 3600, 4100, 4600, 5600, 6600, and 7600 tractors. It documents design changes and model-specific service procedures for use with the Ford Tractor Repair Manual.

PDF Bookmarks, Diagram Detail, and Page Count

Chapter bookmarks open the engine, fuel, electrical, and hydraulic sections. The PDF has no built-in text search. Small terminal markings and dense hydraulic legends are easier to read when zoomed in.

The download contains one printable English-language PDF with 126 pages, including the foreword and three contents pages.

Engine Changes, Charging Tests, and Hydraulic Overhaul

This selection from the supplement covers major service topics. Ford also documents removal and installation of the revised tachometer drive.

• Model cross-reference links the 2000 to the 2600, 3000 to 3600, 3055 to 4100, 4000 to 4600, 5000 to 6600, and 7000 to 7600. The 5600 has no direct predecessor in the chart.

• Diesel engine changes include circular intake ports and matching manifolds, revised piston bowls and intake valves, cylinder head gaskets, and separate injection pump drive timing marks for three- and four-cylinder engines.

• Fuel injection bench data includes six model-specific distributor pump test plans covering priming, transfer pressure, advance, delivery, governor setting, and shutoff. The 7600 has separate inline pump specifications.

• Motorola charging-system service covers in-tractor isolation diode, field circuit, regulator, and output tests, plus alternator disassembly, component inspection, bench testing, and troubleshooting.

• Hydraulic pump configurations distinguish the standard piston and optional engine-mounted gear pumps on the 2600 and 3600 from the transmission-mounted tandem gear pumps on the larger models.

• Hydraulic lift service covers draft and position linkage adjustments, valve and bushing work, flow-control linkage, filter and cooler assemblies, and overhaul of engine-mounted and transmission-mounted gear pumps.

The supplement is suited to experienced mechanics familiar with the base repair manual and equipped for fuel pump bench testing, electrical measurements, and hydraulic pressure diagnosis.

Work That Requires the Base Manual

The base manual supplies general service procedures for the clutch, transmission, PTO, axles, brakes, and steering, as well as injection pump overhaul. It also supplies pressure-test procedures for the 2600/3600 piston pump and the 5600/6600/7600 transmission-mounted pumps.

The supplement provides the gauge-and-load-valve test for the 2600/3600 engine-mounted gear pump and the 4100/4600 transmission-mounted gear pump. For the 5600, 6600, and 7600, it includes lift-cover removal and installation and directs readers to the base manual for full lift-cover disassembly and assembly and for Load Monitor adjustments.

Engine Parts and Charging Diagnosis

Porting and piston illustrations help identify the revised heads and pistons, which do not interchange with earlier designs. The 5600 exhaust valves and seat inserts differ from the 6600/7600 parts, and the 7600 twin-entry turbocharger does not interchange with its predecessor.

Fuel tables identify injector and nozzle assemblies and distributor pump type numbers by model. The 7600 inline pump data covers timing, delivery, governor settings, lubrication, and torque.

The alternator exploded view and rotor current-draw diagram support rectifier, stator, rotor, brush, and bearing checks. The specifications include hot output and regulator voltage by temperature. Reversed battery polarity or disconnecting the charging circuit while the alternator is running can damage the diodes or regulator.

Hydraulic Circuits and Fault Finding

The Narrow, Narrow Orchard, and Vineyard variants retain the single-lever lift control. For the 5600, 6600, and 7600, Ford distinguishes tandem pump versions by Dual Power fitment and shows how that changes the rear pump’s clutch supply and lubrication circuits.

Hydraulic schematics trace lift and auxiliary oil flow. The fault charts help distinguish a weak pump from lift-cylinder leakage or a valve fault when the hitch will not lift, lifts slowly under load, or will not lower.

Service references include torque tables, pump outputs, linkage shims, color-coded valve and bushing grades, capacities, and specified lubricants. Ford identifies T.8510 bushing tools, SW3/SW508 and SW28/6210 setting gauges, and T.8503 or N-1100 pressure-test equipment. The procedures call for securing raised implements and relieving hydraulic pressure. Ford also flags the risk of damaging the drive-shaft threads or seal during engine-mounted pump disassembly.

Engine-Mounted Gear Pump Inspection Examples

For the 2600/3600 engine-mounted gear pump, Ford gives 0.004 in (0.10 mm) as the maximum inlet-side gear track depth for reusing the pump body. The drive and driven gear widths must match within 0.0002 in (0.005 mm).