2003 Harley-Davidson Dyna FXD, FXDL, FXDX, FXDXT, FXDWG Service Manual (P/N 99481-03A)

Harley-Davidson's 2003 Dyna Models Service Manual, P/N 99481-03A, covers the carbureted FXD, FXDL, FXDX, FXDXT, and FXDWG models. It documents routine maintenance and component-level repair for the Twin Cam 88 platform.

• Engine repair: Engine removal and installation, top-end and bottom-end overhaul, cylinder-head service, cam support plate work, and oil-pump inspection.

• Primary drive and transmission: Clutch pack and bearing service, compensating sprocket alignment, drive-belt replacement, shifter cam assemblies, and transmission gearset disassembly.

• Chassis and brakes: Sealed wheel-bearing replacement, wheel lacing and truing, front brake caliper repair, master-cylinder service, and brake bleeding.

• Suspension and steering: Model-specific fork procedures, FXDX/FXDXT damping adjustments, steering-head bearing fall-away checks, vehicle alignment, and engine mount stabilization.

• Fuel system: C.V. carburetor disassembly, float adjustment, vacuum-operated fuel-valve testing, and California evaporative emissions canister and hose service.

• Electrical service: Starter and jackshaft repair, battery testing, MAP and CKP sensor replacement, main circuit breaker service, and TSM/TSSM removal and installation.

• Workshop references: Exploded assembly views, wiring schematics, connector pin views, torque tables, maintenance charts, metric conversions, and Kent-Moore specialty-tool references.

The manual supports basic owner maintenance, while its major repair methods are written for professional Harley-Davidson technicians and specify dedicated service tools.

Twin Cam Engine Diagnosis and Overhaul

Compression and cylinder-leakage tests help narrow down a low-compression complaint before top-end teardown. The Compression Test Results table relates test patterns to piston-ring, valve, and head-gasket problems.

Cylinder-head procedures extend to valve-guide replacement and valve-seat refacing. Cylinder boring and honing are backed by Oversize Pistons/Cylinder Bores tables; cam support plate service covers cam bearings, chain tensioners, and timing alignment.

Repair limits: The flywheel and connecting rods are serviced as an assembly, with factory service or assembly replacement specified. The maintenance cautions also warn that retightening cylinder-head bolts can damage the engine.

Clutch, Gearsets, and Belt Drive

Transmission coverage includes mainshaft and countershaft disassembly, shifter-fork inspection, side-door bearing replacement, and clutch-release ramp service. Primary-drive sections explain sprocket alignment and clutch hub bearing work, while the Drive Belt Wear Analysis table illustrates belt damage.

The clutch inspection-cover cautions explain how residual lubricant around the quad ring can cause temporary weepage.

Wheels, Forks, and Brake Service

Wheel procedures distinguish cast-wheel runout checks from lacing and truing 16-, 19-, and 21-inch rims. Sealed bearing work identifies installer/remover HD-44060.

FXDX/FXDXT cartridge-valve forks have dedicated damper removal, seal and bushing inspection, oil-level setup, and reassembly procedures using spring compressor HD-41549-A. Separate sections cover FXD/FXDL and FXDWG forks, with chassis tables documenting suspension geometry.

Brake service covers D.O.T. 5 silicone fluid bleeding and caliper inspection. Rear master-cylinder procedures cover cartridge replacement rather than internal piston-cartridge disassembly. Follow the manual's safety precautions for brake work, fuel handling, and electrical isolation.

Carburetor and California Emissions Equipment

The C.V. carburetor section connects poor idle, hard starting, and acceleration complaints with component checks. Vacuum-piston operation, accelerator-pump inspection, enrichener adjustment, and idle-speed references support carburetor service.

California-specific coverage includes the air-cleaner backplate, charcoal canister, and the CA Evaporative Emissions Control System schematic and hose-routing illustrations.

Starter, Sensors, and Model-Specific Wiring

Starter procedures include armature checks, solenoid service, and jackshaft disassembly. Battery load testing is accompanied by the Battery Charging Rates/Times table.

Appendix B separates Dyna Glide and FXDWG wiring diagrams for domestic and international models. Connector pin views and AMP Multilock, Deutsch, Mini-Deutsch, and Packard terminal-service instructions support harness repairs.

Separate diagnostic manual required: Detailed fault-code diagnosis and the TSM/TSSM Vehicle Delivery procedures after module replacement refer to the Dyna Models Electrical Diagnostic Manual, which is not included.

Spark Plug and Front Axle Specification Preview

The electrical specifications list a 0.038–0.043 in. (0.97–1.09 mm) gap for the specified Harley-Davidson No. 6R12 spark plug.

The chassis torque tables give 50–55 ft-lbs (67.8–74.6 Nm) for the front axle nut, alongside separate requirements for the axle pinch and slider-cap hardware.

Reading the Wiring Sheets and PDF Contents

Text search and diagram viewing: PDF text search and embedded bookmarks are not available. The large wiring sheets are sideways; small pin numbers and wire-color codes need zooming and are easier to follow after rotation.

The download is one printable English 525-page PDF, including both covers, front matter, section dividers, notes pages, the index, and 22 wiring-diagram title pages.