1985–1988 Ford 555B Loader Backhoe Parts Catalog Manual (P/N D4NN1007A)

This 556-page parts catalog PDF covers the Ford 555B 3-cylinder tractor loader backhoe for the June 1985 through October 1988 production range. Whether sourcing hardware for maintenance or planning a repair, it helps match the machine's exact build configuration before parts are ordered. Each figure combines an exploded assembly view with a keyed table showing reference number, part number, quantity, description, application dates, and related ordering notes. The opening figure index also lets you search the PDF by figure code and move directly to the required assembly.

• Axles, brakes, and steering: Covers service brakes, handbrake and twin-cable controls, rear axle differential and differential-lock linkage, the 2WD front axle, power-steering motor and column, steering pump and reservoir, and the power-steering cylinder changes covering units through June 1987, dual-cylinder systems from July 1987, and single-cylinder systems from January 1988.
• FWD axle configurations: Separates the AE3-184 front-drive axle from the 710-19 axle series introduced in January 1988, with dedicated figures for housings, differential boxes, bevel gear and pinion sets, reduction gears, driveshafts, steering arms and tie rods, transfer-case or gearbox components, center-housing internals, transmission shafts, shields, and front supports.
• Engine and transmission parts: Breaks down the 3-cylinder diesel cylinder block and head, the stepped-stud block used from December 1986, crankshaft and flywheel, camshaft and valve gear, pistons and connecting rods, oil pump and sump, manifold and exhaust, gasket sets, and overhaul kits. Transmission coverage includes the 6x4 manual reversing unit, 4x4 power-reverse torque-converter/synchromesh assemblies, clutches, control valves, manifolds, oil distribution, filters, and cooler tubes.
• Hydraulic and loader systems: Identifies the hydraulic reservoir and pump drive, Vickers pump, oil filter, pressure and return tubes, unload valve and manifold, and two- or three-spool loader control valves, including return-to-dig and 4-in-1 arrangements where listed. Loader figures cover controls, lift arms and linkage, hydraulic lines, lift and bucket cylinders, buckets, and counterweights.
• Backhoe configurations: Distinguishes center-pivot and European side-shift machines, 2-lever and 4-lever controls, extendable-dipstick foot controls, standard and hydraulically extendable dipsticks, swing posts and carriages, carriage-clamp parts, booms, transport locks, hydraulic lines, stabilizers, swing/lift/crowd/bucket cylinders, control valves, stabilizer pads, and multiple North American bucket groups.
• Electrical, cab, and operator-station equipment: Includes North American and European electrical assembly breakdowns, left- and right-hand harness assemblies, cab and ROPS lighting, battery, starter, alternator, instruments, seats, panels, wipers, heaters, air-conditioning parts, and the revised cab, subframe, electrical, trim, and defroster groups used from March 1988.

This is a parts catalog, not a repair manual. It does not contain diagnostic flowcharts, hydraulic pressure-test procedures, adjustment instructions, teardown sequences, wiring-circuit schematics, or component tightening-torque tables. Use it to establish the correct assembly and orderable hardware before a repair, then follow the appropriate service or repair manual for disassembly, inspection, adjustment, and reassembly. Raised loader or backhoe structures, heavy axle components, and pressurized hydraulic circuits must be secured and depressurized with the correct shop equipment before work begins.

Component Specifications & Diagrams

The exploded figures are detailed enough to identify individual hardware within larger assemblies. In the 2WD front-wheel figure, for example, wheel assembly D4NN1007A is shown alongside the hub, bearing cups and cones, retainer, grease washer, slotted nut, cotter pin, and hub cap. Similar reference tables identify seals, O-rings, bearings, shims, spacers, bushings, shafts, gears, repair kits, and fasteners throughout the drivetrain, hydraulic system, loader, and backhoe.

Production-date notes are central to correct part selection. Rows may specify Start Year, End Year, regional application, cab or ROPS use, 2WD or FWD fitment, transmission type, axle ratio, or replacement instructions. The tables also flag parts that are not serviced separately, items that must be ordered as kits, locally sourced hardware, superseded numbers, service-bulletin references, and assemblies whose internal references are included under one part number. Matching those notes to the machine helps prevent ordering a visually similar but incompatible component.

Several replacement cautions are easy to miss in a quick parts search. The 710-19 planetary reduction-gear section directs the old-style retaining ring, wheel carrier, and ring gear to be replaced as a group. The AE3-184 steering-arm table likewise calls for both revised arms when either earlier arm is replaced. The 710-19 bevel-gear and pinion breakdown also identifies a collapsible spacer; treating it as an ordinary reusable spacer can produce incorrect pinion-bearing preload and damage the bearings.

Fastener rows identify thread size, length, grade or ISO class—such as G5, G8, CL 8.8, and CL 10.9—while seal, bearing, and shim entries often include dimensional data. A multilingual abbreviation key and common metric-to-inch hardware substitution chart are included near the end of the catalog. The chart specifically warns that substitution does not apply to tapped holes or to mixing metric nuts with inch fasteners, or inch nuts with metric fasteners. These references support parts identification and hardware matching; they are not torque specifications or repair procedures.