Case 480C Tractor Backhoe Service Manual Collection, 1976 (P/N 9-66025)

The service manual supplies workshop repair procedures, while the brochure provides period operating data and specifications for the 480 Construction King. The brochure does not extend the service manual’s 480C model coverage.

PDF Bookmarks, Search Limits, and Wiring Detail

Search and diagram access: Text search is limited to four introductory navigation pages; the service-manual pages and brochure are not text-searchable. Embedded bookmarks open the major systems and selected component sections. Small labels in the cab and canopy wiring diagrams require zooming. The main wiring foldout is cropped and very faint, leaving parts of that circuit unavailable or unreadable.

One printable, English-language PDF contains 761 pages: the 753-page service-manual portion, the two-page brochure, and six added cover/navigation pages. All additional pages are included in that total.

Diesel Engine, Hydraulic, and Drivetrain Repair

These selected contents outline the main workshop coverage rather than reproduce the full table of contents. Other topics include ether-injection equipment and spark-arresting muffler service.

• Engine repair: Step-by-step procedures for cylinder-head and valve-train work, crankshaft and bearing service, oil-pump repair, engine removal, and 188 diesel block, sleeve, and piston work.

• Fuel-system service: Roosa Master Model DB pump removal and timing, drive-gear work, injector testing and servicing, filter replacement, and fuel-system bleeding.

• Hydraulic diagnosis: Circuit troubleshooting, flowmeter tests, pump overhaul, control-valve repair, cylinder rebuilding, and relief-valve checks for the documented equipment configurations.

• Powertrain repair: Transaxle and differential-lock rebuilding, clutch and pressure-plate service, drive-shaft work, and two-speed mechanical-shuttle disassembly and adjustment.

• Steering and brakes: Steering pressure checks, pump and control-valve repair, cylinder service, front-axle work, and self-adjusting differential-brake repair.

• Electrical testing: Starting- and charging-circuit diagnosis, instrument-cluster checks, battery tests, starter/solenoid overhaul, alternator service, and wiring diagrams with color-code keys.

• Mounted equipment: Loader and backhoe removal and installation, three-point hitch service, extendable-dipper components, boom-lock equipment, and ROPS, cab, and canopy inspection.

This manual is suited to service technicians familiar with mechanical overhaul and workshop measuring equipment; injector testing requires a dedicated test stand.

Engine Coverage and Valve-train Details

The engine chapters distinguish between shared and engine-specific work. Diagnosis, tune-up, cylinder-head and camshaft repair, crankshaft service, oil-pump work, cooling, and lubrication cover the 188 and 207 diesel families. The cylinder-block, sleeve, piston, and connecting-rod chapter is specifically for the 188 diesel.

Diagnostic charts address hard starting, failure to keep running, misfire, knock, overheating, low power, excessive oil consumption, and low oil pressure. Repair detail includes valve-guide and seat work, camshaft-bushing replacement, timing-gear setup, bearing inspection, oil-seal replacement, radiator removal, thermostat testing, and water-pump service.

The serial-specific filter, rocker-arm oil-feed, and rear camshaft-bushing information distinguishes early and late arrangements before parts or assembly procedures are selected.

After cylinder-head resurfacing, valve protrusion and recession checks address the risk of piston-to-valve contact. Incorrect oil-feed arrangements or mismatched rocker-arm adjusting screws can interrupt valve-train lubrication, while sleeve-cleaning residue and block sediment can damage rebuilt components and bearings.

Injection Equipment and Workshop Tools

Fuel-system detail includes pump-drive backlash, installation timing, governed-speed checks, nozzle identification, opening-pressure tests, leakage checks, and spray-pattern assessment. The revised injector application chart distinguishes 188D, 207D, and 207DT applications; that chart does not establish additional 480C engine variants.

Tool references identify the M20322/Bacharach 65-934D injector test stand and M20520 injector tool kit, which includes the Bacharach 70-314 (D-558) compression-gauge adapter. Other references include the A43278 injector removal tool, A43277 injector-bore cleaner, A43112 valve-guide reamer, and A40682 sleeve clamp bar. Dimensioned drawings support fabrication of specified shop-made tools.

Hydraulic Fault Isolation and Equipment Configurations

The troubleshooting material separates faults affecting one circuit, the loader, the backhoe/three-point hitch, or the entire hydraulic system. Combined with the flowmeter tests, this helps distinguish pump-output problems from leakage in a particular valve or cylinder before component teardown.

Separate procedures address Cessna, TRW, Dana, and Borg-Warner pumps, including inspection, assembly, break-in, and failure analysis. Configuration-specific material covers the two-stage main relief valve, pump-protection valve, selector valve, PTO motor, boom lock, and dipper-extension controls.

Named drawings include the Loader Hydraulic Diagram, Backhoe Hydraulic Diagram, Extendable Dipper Hydraulic Diagram, and Steering Hydraulic Diagram. Mounted-equipment illustrations distinguish hand-swing and foot-swing controls and show cylinder plumbing, pivot bushings, bearing washers, and bucket cutting edges and teeth.

Drivetrain, Brakes, and Electrical Reference

Transaxle procedures reach into final drives, axle housings, mainshaft and countershaft assemblies, differential center-wheel and side-gear rebuilding, bearing preload, and gear backlash. The shuttle chapter also covers the dual-range housing and neutral-start-switch adjustment.

The revised transaxle/differential-lock and self-adjusting-brake sections are marked for naturally aspirated machines. Retained updates include July 1980 shuttle material and December 1980 injector, transaxle, and brake revisions. Steering coverage adds wheel bearings, king pins, and toe-in; brake procedures extend from master cylinders and pedal linkage to the differential-brake assemblies.

Electrical reference includes the Cab Wiring Diagram and PTO Tachometer Circuit, component legends, test charts, and cab/canopy accessory installations. Factory data provides maintenance schedules, fluid specifications, torque tables, hydraulic-fitting torques, wear limits, and component adjustment data.

Before lifting the engine or backhoe, servicing a raised loader, opening hydraulic circuits, or testing injectors, follow the manual’s support, pressure-release, and high-pressure fuel precautions.

Preview of Oil-pump Inspection and Gear Settings

For the 188/207 diesel oil pump, the inspection procedures specify replacement when gear-to-body radial clearance exceeds 0.008 in or gear-to-cover clearance exceeds 0.008 in.

The installation section specifies 0.002–0.008 in backlash between the oil-pump drive gear and crankshaft gear. These examples accompany the component inspection and gear-setting procedures rather than serve as a complete repair specification.