Harley-Davidson Golf Cart D, DF, DC, MGIV, DE4 Service Manual, 1963–1980 (P/N 99496-80)

• Covers 1963–1980 Harley-Davidson gasoline models: three-wheel D Golf Car, DF Personnel Carrier, and DC Utilicar, plus the four-wheel D4 Golf Car. D4-specific coverage begins with 1972 models.
• Engine repair includes cylinder and piston inspection, crankcase disassembly, connecting-rod service, crankshaft truing, bearing replacement, and reassembly of the single-cylinder, air-cooled Model D two-cycle engine.
• The Scootaway automatic V-belt drive receives primary and secondary flange overhaul procedures, belt inspection, drive alignment, and model-specific clearance and shim adjustments.
• Brake coverage separates D/D4 mechanical driveshaft-disc brakes, DF/DC rear drum brakes, and 1966–1972 DC hydraulic brakes, including master-cylinder and wheel-cylinder repair and bleeding.
• Chassis procedures address steering-gear adjustment, front-fork and D4 front-suspension overhaul, rear-fork bushings, and engine-mount vibration diagnosis.
• Electrical fault tracing covers starter solenoids, reversing switches, diodes, ignition-coil testing, and model- and year-specific wiring diagrams.

Publication, File Contents, and Identification

Columbia ParCar’s Service Manual, P/N 99496-80, issued January 2001, is supplied as a 204-page PDF. A second 207-page scan carries a 1984 copyright page and appended wiring sheets. Together, the files contain 411 pages with substantial overlap, including covers and notes pages.

The repair chapters cover gasoline cars. Supplemental electric-model diagrams in the second file are wiring references, not a full electric-car repair manual.

Five core sections—Product, Chassis, Engine, Transmission, and Electrical—organize the material. Frame-VIN and engine-number identification, model-specific lubrication charts, and the Trouble Location Chart help connect a vehicle or symptom with the appropriate service section.

Two-Cycle Engine and Fuel-System Repair

The engine specifications distinguish low- and high-compression heads. High-compression head applications include all 1971-and-later DC engines and 1971-and-later D engines above serial No. 13000.

Rebuild data covers piston-to-cylinder clearances, mainshaft runout limits, bearing fits, crankshaft end play, and cylinder-head bolt torques. Cylinder boring and honing, piston-ring fitting, and crankshaft inspection extend the coverage beyond routine maintenance.

Fuel-system repair addresses the carburetor’s crankcase-pulse-operated diaphragm pump, inlet-needle leak testing, reed-valve inspection, and throttle, choke, and governor adjustments. The Carburetor Cross-Section accompanies the explanations of internal fuel and air circuits.

Tool listings identify Crankshaft Tool Set 96122-63 and Carburetor Leak Tester 94750-68. Separate press-fixture instructions address 1977–1980 crankshafts. The cylinder-assembly cautions explain a specific failure risk: twisting the cylinder can misalign the rings with their locating pins, breaking the rings and damaging the engine.

Reversing Gearboxes, Differentials, and Drive Changes

Mechanical reversing-unit service for 1963–1966 D and 1963–1968 DC models is separate from the later systems that reverse engine rotation. The Reversing Unit and Coupling—Exploded View supports gearbox work involving pinions, the shifter clutch, bearings, and drive couplings.

Rear-axle procedures distinguish the late-1977–early-1978 all-aluminum differential from earlier assemblies and late-1978-and-later axle arrangements. The sections cover bearing preload, gear backlash, shim selection, and lubricant-capacity specifications rather than treating every rear axle as interchangeable.

The Wheel Lockout Hub, Section View supports service of the 1963–early-1977 hub assembly. Transmission details also identify the weights used in the 1980 cast-iron floating flange, distinguishing that build from ball-operated versions.

Frame Geometry and Steering Configurations

Frame-alignment drawings separate three-wheel and four-wheel configurations, including 1975 and Later Model D4 Basic Frame Dimensions. These references accompany frame inspection rather than assuming one chassis layout across the series.

Tiller-steering service distinguishes the chain-operated mechanism used through 1973 from the slider-block arrangement introduced for 1974. Steering-wheel systems have their own worm-bearing, over-center, and tie-rod adjustments. Suspension diagnosis also connects worn fork and mounting components with specific vibration complaints.

Starter-Generator, Charging, and Ignition Diagnosis

SIBA, Bosch, and Hitachi starter-generators receive separate teardown and reassembly coverage. Armature growler tests, field-coil checks, brush inspection, and commutator service support internal electrical repair.

Charging diagnosis separates 1967–early-1968 resistor-controlled circuits from later voltage-regulator systems. The Starter-Generator Test Circuit accompanies output testing, while the regulator section includes Hitachi charge-rate adjustment. Ignition coverage distinguishes breaker-point adjustment from spark-plug gap specifications and addresses both forward and reverse timing.

For late-1978-and-later rigid starter-generator mounts, the belt section warns that an overlong belt can let the DF terminal contact the air cleaner and short out the voltage regulator.

Service precautions address battery isolation, fuel handling, and positive support of the raised body and chassis.