🏷️ Basic Information

Make:

Harley-Davidson

Model:

FLHTCUL Electra Glide Ultra Classic Low

Year:

2015

Model Code:

FLHTCUL

Engine Family Code:

103

👋 Introduction

Segment:

Full-size, luxury touring motorcycle.

Target Audience:

Touring riders seeking comfort, long-distance capability, and premium features.

Competitors:

Includes other large displacement touring motorcycles from brands like Honda (Gold Wing), Indian (Roadmaster), and potentially some European touring bikes.

Model Designation:

FLHTCUL - Electra Glide Ultra Classic Low, denoting a lower seat height compared to the standard Ultra Classic.

Engine Type:

Twin-Cooled Milwaukee-Eight V-Twin (Note: While the manual is for 2015, Harley-Davidson transitioned to Milwaukee-Eight starting in 2017. The 2015 model would be Twin Cam 103.)

Touring Equipment:

Full fairing with windscreen, integrated saddlebags, trunk (Tour-Pak), passenger backrest, audio system, cruise control.

Low Ride Height:

Specifically designed for riders who prefer a lower seat height for easier ground reach and maneuverability.

📋 Manual Details

Primary Coverage:

Maintenance, troubleshooting, repair, and diagnostics for the 2015 Harley-Davidson FLHTCUL Electra Glide Ultra Classic Low.

Secondary Coverage:

Includes electrical system diagrams, component locations, specifications, and torque values.

Estimated Pages:

Approximately 700-900 pages (typical for a comprehensive Harley-Davidson service manual of this era).

Type:

Service Manual / Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, cylinder heads, pistons, connecting rods, crankshaft, timing, lubrication system.

Fuel System:

Fuel injection system (EFI), throttle body, fuel pump, fuel injectors, fuel tank, fuel lines.

Ignition System:

Ignition module, spark plugs, ignition coils, crank position sensor.

Transmission Drivetrain:

Primary drive, clutch, transmission gears, shift drum, drive belt, final drive.

Electrical System:

Battery, charging system (alternator, regulator), starting system (starter motor), lighting (headlight, taillight, turn signals), gauges, horn, wiring harnesses, fuses, relays.

Braking System:

Brake calipers, master cylinders, brake lines, brake pads, brake discs, ABS system (if equipped).

Suspension Steering:

Front forks (preload adjustment, damping), rear shock absorbers, steering head bearings, wheel bearings.

Chassis Frame:

Frame inspection, swingarm, pivot bearings.

Bodywork Trim:

Fairing, saddlebags, tour-pak, seat, handlebars, controls, trim pieces.

Infotainment Audio:

Boom! Box audio system, speakers, CB radio, intercom, radio controls.

Preventive Maintenance:

Scheduled maintenance intervals, oil changes, filter replacements, lubrication, tire pressure checks, brake inspections.

Diagnostics Troubleshooting:

Step-by-step troubleshooting guides for common and uncommon issues, diagnostic codes (DTCs), component testing.

Engine Repair:

Complete engine rebuild procedures, valve adjustments, piston and ring replacement, bearing service.

Transmission Repair:

Clutch replacement, transmission gear inspection and replacement, seal replacements.

Electrical Diagnosis:

Wiring diagram interpretation, circuit testing, component replacement (e.g., starter, alternator, ignition module).

Brake Service:

Brake pad replacement, caliper service, master cylinder bleeding, ABS component service.

Suspension Fork Rebuild:

Front fork disassembly, fluid replacement, seal replacement, rear shock absorber service.

Bodywork Installation Removal:

Removal and installation of fairings, saddlebags, tour-pak, and related trim.

Special Tool Usage:

Identification and usage of Harley-Davidson specific and general repair tools.

Depth:

Comprehensive, covering everything from routine maintenance to complete engine and transmission overhauls. Includes detailed diagnostic procedures and specifications.

📊 Manual Specifications

File Type:

PDF

Searchability:

Likely text-searchable, allowing quick access to specific information. Images and graphics are present.

Graphics Resolution:

Good resolution for clear viewing of diagrams and illustrations. Recommended to use Adobe PDF Reader for optimal display.

Binding:

N/A (Digital PDF format)

Paper Type:

N/A (Digital PDF format)

⚙️ Engine Specifications

Engine Family:

Twin Cam 103™

Engine Type:

Air-cooled, Twin Cam 103™ V-twin

Displacement:

103 cubic inches (1690 cc)

Bore X Stroke:

3.875 in. x 4.380 in. (98.4 mm x 111.3 mm)

Compression Ratio:

9.1:1

Torque Peak:

Approx. 104.7 ft-lbs (141.9 Nm) @ 3500 RPM (Specifications may vary slightly)

Horsepower:

Approx. 75 HP @ 5000 RPM (Specifications may vary slightly)

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI) with O2 sensors

Fuel Type:

Unleaded gasoline, minimum 87 octane

Fuel Tank Capacity:

6.0 gallons (22.7 L)

🔧 Transmission

Transmission Type:

6-speed Cruise Drive®

Primary Drive:

Patented single-belt 34/46 ratio

Final Drive:

Carbon-fiber belt, 32/68 ratio

Clutch:

Hydraulically actuated, 9-plate wet clutch

Transmission Fluid Type:

Formula SAE 50 (Harley-Davidson recommends their own proprietary fluid or equivalent)

📐 Dimensions

Length:

100.4 inches (2550 mm)

Seat Height Laden:

25.5 inches (648 mm)

Ground Clearance:

4.9 inches (125 mm)

Dry Weight:

Approx. 838 lbs (380 kg)

Weight In Running Order:

Approx. 890 lbs (403.7 kg)

Saddlebag Capacity:

Approx. 2.2 cubic feet

Tour Pak Capacity:

Approx. 2.4 cubic feet

🛡️ Safety Features

Safety Features:

Anti-lock Braking System (ABS) available on certain models/packages, integrated braking system.

ABS:

Anti-lock Braking System (Standard on this specific trim for 2015).

Cruise Control:

Electronic cruise control

Lighting:

Halogen headlight, LED auxiliary running lights and brake lights, clear lens turn signals.

💡 Technology Features

Audio System:

Boom! Box 6.5 GT infotainment system with touchscreen, GPS navigation, AM/FM radio, and CB/Intercom functionality.

Connectivity:

Bluetooth connectivity for audio streaming and hands-free calling. USB port for device charging and media playback.

Cruise Control:

Standard electronic cruise control for comfortable highway cruising.

Lighting:

Daymaker LED headlamp and fog lamps (optional on some trims, but common on Ultra models) for improved nighttime visibility.

🔧 Maintenance

Engine Oil Change:

Every 5,000 miles or 6 months, whichever comes first. Recommended oil change interval for the Twin Cam 103.

Transmission Primary Fluid Change:

Every 10,000 miles or 12 months, whichever comes first.

Brake Fluid Flush:

Every 24 months. DOT 4 synthetic brake fluid recommended.

Spark Plug Replacement:

Refer to manual, typically around 20,000-30,000 miles, depending on plug type and usage.

Air Filter Cleaning Replacement:

Inspect every 5,000 miles, clean or replace as needed. Higher frequency in dusty conditions.

Engine Oil:

Harley-Davidson 20W-50 SYN3 (Synthetic) or equivalent premium V-twin motorcycle oil.

Engine Oil Capacity:

4.0 US quarts (3.8 L) with filter change for Twin Cam 103.

Transmission Fluid:

Harley-Davidson transmission lubricant or Formula SAE 50.

Primary Chain Case Fluid:

Harley-Davidson primary chain case lubricant or Formula SAE 20W-50.

Fork Oil:

Refer to manual for specific type and viscosity (e.g., Harley-Davidson Type 'E' or 'B', or equivalent).

Twin Cam 103 Considerations:

Potential for oil pressure issues if not properly maintained, cam chain tensioner wear (hydraulic tensioners are known to wear over time and may require replacement with upgraded components), and some reports of starter clutch issues.

Electrical Connectors:

Corrosion or loose connections in wiring harness can lead to intermittent electrical faults. Regular inspection is recommended.

Suspension Leaks:

Fork seals and rear shock seals can degrade over time, leading to fluid leaks.

📚 Vehicle History

Founding:

Founded in Milwaukee, Wisconsin in 1903, one of the longest-standing motorcycle manufacturers in the world.

Electra Glide Lineage:

The Electra Glide series has a long history dating back to the 1960s, evolving into the definitive American touring motorcycle.

Ultra Classic Trim:

The Ultra Classic represents the pinnacle of Harley-Davidson's touring comfort and features, typically including all the amenities for long-distance riding.

Low Variant:

The 'Low' designation signifies a factory-designed modification to lower the seat height and potentially adjust suspension for rider comfort and accessibility.

Engine Platform:

The 2015 model features the Twin Cam 103 engine, which was a staple for Harley-Davidson's touring and cruiser models prior to the introduction of the Milwaukee-Eight.

🏆 Awards & Recognition

Market Perception:

Consistently ranked as one of the premier touring motorcycles for its blend of comfort, features, and performance, though often facing comparisons for its price point and weight.