Ford 550 Loader Backhoe 1975–1978 Parts List

• Illustrated OEM parts catalog for the Ford 550 3-cylinder tractor-loader-backhoe, with the figure index specifically marked 1/75–9/78. The 549-page PDF is organized around exploded-view figures and matching Ref / Part Number / Qty / Description lists.
• Well over 800 specific part numbers are mapped to illustrated assemblies covering brakes, steering, axles, engine, transmission, hydraulics, loader, backhoe, fuel, electrical, cab, ROPS, and attachment groups.
• Covers both gasoline and diesel engine hardware, including cylinder block and head, crankshaft and flywheel, camshaft and valvetrain, pistons and connecting rods, oil pump, manifolds, gasket kits, and diesel overhaul kits.
• Transmission coverage includes the 6 x 4 manual reversing gear and clutch assemblies and the 4 x 4 power-reverse torque-converter transmission, with separate figures for the converter, oil distributor, clutch/gears, control levers, and filter/cooler tubes.
• Hydraulic pump identification is separated by build: Cessna through 3/31/1978; Webster 26.6 GPM from 1/1/1978 through 1/31/1982; and Vickers 28.5 GPM beginning 4/1/1978 for the listed E7NN600BA pump. Two- and three-spool loader valves, Return-to-Dig components, and Auto-Dig/backhoe valve sections are broken out separately.
• Backhoe and attachment coverage includes center-pivot and European sideshift configurations, Auto-Dig controls, a North American 7/8-yard 4-in-1 bucket and forks, ROPS and cab assemblies, cab heating/air-conditioning parts, and European extendable-dipstick hydraulics identified as 81/83.
• Fuel and ignition/electrical parts include the Holley carburetor, rotor-type fuel-injection pump, CAV and Simms fuel-filter heads, Motorcraft and Mallory gasoline distributors, starters, alternators, lamps, instruments, and market-specific electrical-system assemblies.

Assembly and Component Breakdown

The value of this parts book is in the connection between the exploded views and the part-number tables. A mechanic can follow a numbered callout from a figure directly to the listed part, quantity, supersession or application note. That is especially useful when an upcoming repair involves components that changed during production or were later serviced by updated parts.

Fitment notes deserve close attention. The index contains a 4WD front-wheel figure, but the detailed AE3-184 FWD axle, differential, driveshaft, reduction-gear, steering-arm, and center-housing groups carry later application dates; several European FWD figures are specifically marked 1980–1983. Those entries should be matched by figure, date, and market rather than treated as generic 1975–1978 fitment. The catalog also separates North American and European lighting, cab, frame, sideshift, and control configurations.

Representative figures show the parts-identification depth: 05A03 “Hydraulic Filter & Tubes,” 07B04 “Torque Converter, Clutch & Gears, 4 x 4,” 09C01 “Fuel Injection Pump, Rotor,” 11A01 “Electrical System, North America, LH,” 19E01 “Hydraulic Control Parts, Auto-Dig, Center Pivot,” and 19M02 “Extendable Dipstick Hydraulics, Europe.” The injection-pump assembly alone is broken into more than 100 referenced items, while major loader and backhoe control-valve figures identify individual spools, springs, poppets, seals, plugs, and relief components.

Fitment and Repair-Relevant Detail

Engine listings go beyond basic assembly names. Gasoline and diesel piston groups identify standard and oversize parts, including .004", .020", .030", and .040" oversize piston options, while connecting-rod and main-bearing listings include undersize service selections. This matters when ordering repair parts for an engine that has already been machined.

Hydraulic components are also distinguished by the pressure shown in their part descriptions. Examples include a 1700 PSI center-pivot cushioning valve and backhoe control-valve variants identified at 2350, 2600, 2800, 3500, and 4000 PSI depending on the valve and cylinder/configuration. These figures are valuable for matching the installed component during hydraulic repair; they are not a single blanket system-pressure specification.

Several catalog notes flag combinations that should not be treated as interchangeable. The diesel piston pages instruct the buyer to verify Headland versus regular piston style and state that a style change is made as a complete set; mixing styles during a partial engine repair can leave an incompatible piston/head combination and risk internal damage. In the FWD steering section, replacing either earlier steering arm calls for ordering both CAR119868 and CAR119867, so installing only half of the matched update can leave the steering linkage with mismatched components. The metric/inch conversion section also warns that substitution does not apply to tapped holes or to mixing metric nuts with inch studs or bolts, and vice versa; forcing mismatched threads can damage the fastener or tapped hole.

This is an illustrated parts catalog, not a procedural workshop manual. It identifies assemblies, part numbers, date breaks, replacement relationships, and component layouts, but it does not provide complete teardown/reassembly sequences, torque-specification charts, fluid-capacity tables, or circuit-level wiring diagrams. Electrical coverage is parts-layout coverage rather than diagnostic schematics.

Working on a loader backhoe involves heavy components and stored hydraulic pressure. Depressurize the relevant hydraulic circuit and positively support raised loader or backhoe structures before disassembly or part removal.