1975–1981 Ford 6600 4-Cylinder Agricultural Tractor Parts Manual

This illustrated parts catalog covers the 1975–1981 Ford 6600 4-cylinder agricultural tractor, with shared assembly listings for other Ford models. It identifies replacement parts, hardware sizes, and component relationships for the configurations specified in each figure.

Figure search and navigation: Figure headings and parts lists contain searchable text. Embedded bookmarks lead to the index, main catalog, and reference sections; individual assemblies can be located by figure number. Illustration callouts are image-based, and dense cab drawings benefit from zooming.

• Engine and fuel systems: Parts breakdowns for diesel and gasoline engines, rotor and inline injection pumps, fuel injectors, and the Holley carburetor.

• Transmission and PTO: Dual Range gear layouts, Dual Power assembly drawings, reduction gear box, single clutches, PTO components, and transmission handbrake linkage.

• Front axle and steering: FWD differential carrier, self-locking differential, hub carrier and planetary drive, transfer box, and manual and power steering gear drawings.

• Hydraulics and hitch: Hydraulic lift cover and linkage views, assemblies with and without Load Monitor, center-housing pumps, remote valves, and automatic pick-up hitch parts.

• Brakes and wheels: Brake controls, hydraulic trailer brake assemblies, front wheels, rear wheel weights, and standard, power-adjustable, and dual rear wheel listings.

• Electrical and cab: Harness layouts and component lists, cab electrical system, air conditioner evaporator, ROPS safety frames, and Super Comfort seat parts.

This catalog is suited to mechanics and experienced owners who can match figure callouts and application notes to the components fitted to their tractor.

Component Identification and Variant Matching

More than 100 exploded-view and assembly drawings pair numbered components with part numbers, quantities, and application notes. The diagrams show relationships between fasteners, seals, and structural housings, while the lists distinguish North American (NHNA) and European (NH-E) equipment.

The shared listings require attention to the model and equipment notes beside each part. Matching those notes to the installed assembly helps avoid ordering incompatible components for a repair; a model appearing in a shared figure does not establish complete catalog coverage for that model.

Engine, Fuel System, and Transmission Parts

Engine listings include replacement-block requirements, gasket and overhaul kit contents, and standard, oversize, and undersize service parts. Radiator and water-pump sections cover the cooling assemblies.

Turbocharger applications: The 6600 turbocharger entries apply to Switzerland-spec tractors. The catalog distinguishes Schwitzer and AiResearch designs and specifies that a replacement must match the design removed.

Transmission bearing matching: D0NN- and C5NN-series bearing cones and cups cannot be mixed. The output-shaft listings identify these matching requirements, helping prevent an incompatible bearing assembly during transmission repair.

Dual Power replacement notes also identify body-and-sleeve combinations and clutch-plate substitutions that require matched parts. These are parts-selection notes, not overhaul procedures.

Cab Applications and Repair Scope

Cab repair-kit reference: The NH-E rear-crossbar repair-kit entry applies before date code 8E05 and identifies cab S/N W.H. 34734 as its reference. It points to separate Service Bulletin #9 (1980) for installation instructions.

Electrical pages show component and harness locations, including rear lighting and cab wiring. They are parts illustrations rather than circuit-level wiring diagrams. This catalog does not replace a workshop repair manual: step-by-step overhaul procedures, diagnostic tests, and tractor service-setting tables are outside its scope.

Structural and high-pressure hydraulic work requires proper support for the tractor and safe pressure relief before service.

PDF Contents and Page Breakdown

One printable PDF contains 725 pages total: 701 catalog pages, a five-page figure index, a one-page figure-search guide, 14 pages of abbreviations, and two hardware-conversion pages. One additional introductory page and one blank page are also included in that total.