🏷️ Basic Information

Make:

Harley-Davidson

Model:

FXDF Fat Bob

Year:

2015

Model Code:

FXDF

👋 Introduction

Category:

Performance Cruiser / Muscle Bike

Target Audience:

Riders seeking power, distinctive styling, and capable handling

Competitors:

Other Harley-Davidson Big Twin models, Indian Chief models, select custom choppers

Styling:

Fat front tire, drag-style handlebars, dual exhaust, aggressive stance

Engine Performance:

Strong low-end and mid-range torque from the Twin Cam 103B

📋 Manual Details

Primary Coverage:

Comprehensive Service and Repair

Estimated Pages:

500+

Type:

Factory Service Manual (FSM)

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine:

Disassembly, assembly, diagnostics, tuning for Twin Cam 103B engine

Transmission:

Service and repair of the 6-speed Cruise Drive transmission

Fuel System:

EFI diagnostics, component testing, and calibration

Electrical System:

Wiring diagrams, component testing, diagnostic procedures for all electrical systems

Brakes:

Front and rear brake system overhaul, bleeding procedures, ABS diagnostics

Suspension:

Front fork service, rear shock absorber replacement and adjustment

Chassis:

Frame, swingarm, and steering head bearing service

Bodywork:

Fender removal, fuel tank maintenance, seat installation

Wheels Tires:

Wheel bearing service, tire replacement, and balancing

Maintenance:

Scheduled maintenance, fluid changes, filter replacements, spark plug service

Diagnostics:

Troubleshooting common problems, using Harley-Davidson diagnostic tools (e.g., HD-DDM)

Repair:

Step-by-step instructions for component repair and replacement

Rebuilds:

Engine and transmission internal component rebuild procedures

Calibration:

EFI system calibration and tuning procedures

Diagnostics Troubleshooting:

Detailed diagnostic flowcharts for common malfunctions, fault code lookup and interpretation.

Depth:

Expert-level, suitable for professional technicians and experienced DIY mechanics

Engine Rebuild Specs:

Includes torque values, piston ring gap, valve clearances, bearing clearances, and assembly sequences.

Electrical Schematics:

Full, detailed color-coded wiring diagrams for all model variations.

📊 Manual Specifications

File Type:

PDF

Searchability:

Fully searchable text for quick information retrieval

Resolution:

High-resolution for clear diagrams and text

Binding:

N/A (Digital Format)

Paper:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Type:

Air-cooled, Twin Cam 103B V-twin

Displacement:

1690 cc (103 cubic inches)

Bore X Stroke:

3.875 in. x 4.38 in. (98.4 mm x 111.3 mm)

Compression Ratio:

9.6:1

Horsepower:

Approx. 78 HP (at crankshaft)

Torque:

Approx. 105 ft-lbs @ 3500 RPM (at crankshaft)

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI)

Fuel Type:

Premium Unleaded Gasoline

Engine Oil:

Harley-Davidson SYN3 (SAE 20W50) or equivalent motorcycle-specific synthetic oil

Oil Capacity:

3.7 US qt (3.5 L)

🔧 Transmission

Type:

6-speed Cruise Drive

Clutch:

Hydraulic, Assist & Slip Clutch

Gear Ratios:

1st: 9.593, 2nd: 6.650, 3rd: 4.938, 4th: 3.814, 5th: 3.111, 6th: 2.513

Transmission Oil:

Harley-Davidson Formula+ (or equivalent 75W90 synthetic gear oil for Harley-Davidson)

Transmission Oil Capacity:

2.4 US qt (2.3 L)

📐 Dimensions

Length:

92.1 in. (2339 mm)

Seat Height:

26.1 in. (663 mm) - Laden

Ground Clearance:

4.7 in. (119 mm)

Rake:

30.0 degree

Trail:

4.9 in. (125 mm)

Dry Weight:

663 lbs (300 kg)

Gross Vehicle Weight Rating:

1043 lbs (473 kg)

Front Tire:

Dunlop D408F, 130/90B16 67H BW

Rear Tire:

Dunlop D407, 180/70B16 77H BW

Fuel Tank Capacity:

5.0 US gal (18.9 L)

🛡️ Safety Features

Braking System:

4-piston front caliper, 2-piston rear caliper; optional ABS

ABS:

Available as an option

Lighting:

Halogen headlamp, LED tail lamp, amber lens front turn signals

💡 Technology Features

System Name:

Optional Boom! Box 6.5GT or 4.3 Infotainment System

Features:

AM/FM radio, USB iPod/iPhone connectivity, Bluetooth, GPS Navigation (6.5GT model)

Features:

Cruise control (standard on many models), ABS (optional)

Features:

Handlebar-mounted audio controls, integrated antenna

🔧 Maintenance

First Service:

1,000 miles (1,600 km) or 6 months

Subsequent Service:

Every 5,000 miles (8,000 km) or 12 months thereafter

Brake Fluid:

DOT 4 (for hydraulic clutch and brake systems)

Primary Chain Case Oil:

Harley-Davidson Formula+, SAE 85W-140 (or specified equivalent)

Primary Chain Case Oil Capacity:

1 US qt (0.95 L)

Common Concerns:

Oil leaks (especially from primary cover and rocker boxes), clutch drag, starter solenoid issues, infotainment system glitches (if equipped with Boom! Box).

Spark Plugs:

Replace at specified intervals, torque specifications critical.

Battery Maintenance:

Ensure proper charging and terminal connection security.

📚 Vehicle History

Heritage:

Founded in 1903, a legendary American motorcycle manufacturer known for its V-twin engines and iconic designs.

Introduction:

The Fat Bob styling cues date back to earlier Harley-Davidson models, but the FXDF designation and modern iterations, including this 2015 version, represent a contemporary take on the classic 'fat tire' cruiser.

Manufacturer:

Harley-Davidson Motor Company

Assembly Location:

York, Pennsylvania, USA

🏆 Awards & Recognition

Industry Perception:

Generally well-regarded for its powerful engine, distinctive styling, and comfortable riding position for its class.

Rider Reviews:

Consistently receives positive reviews for its torque, handling balance, and visual appeal.