Official Service Manual: Harley-Davidson Duo-Glide 74 OHV & Servi-Car Motorcycle (1958-1959)

Official 1958-1959 Harley-Davidson Duo-Glide 74 OHV & Servi-Car Service Manual

Master the mechanics of your vintage Panhead with the definitive Official Service Manual for the 1958 and 1959 Harley-Davidson lineup. This comprehensive factory-issued guide (Part No. 99482-59) provides the technical depth required for the iconic Duo-Glide—the first of the big twins to feature genuine rear suspension—as well as the indispensable Servi-Car.

While specifically authored for the 1959 74 OHV Duo-Glide, this manual is the primary authority for 1958 models and serves as a vital technical reference for earlier 61 and 74 OHV overhead valve engines. Whether you are maintaining a museum-quality restoration or keeping a daily rider on the road, this manual delivers factory-approved repair methods and specifications.

Technical Coverage and Model Insights

Chassis and Suspension

The 1958-1959 era marked a turning point for Harley-Davidson with the introduction of the Duo-Glide frame. This manual covers the swingarm rear suspension system in detail, ensuring your ride retains its legendary "glide" quality. You will find specific instructions for the Hydra-Glide front forks and the rear shock absorber units.

The 74 OHV Engine (Panhead)

Get under the hood of the 1200cc (74 cubic inch) overhead valve engine. The guide includes exhaustive data on:

• Cylinder head repair and valve seating.
• Precision oil pump servicing and lubrication flow diagrams.
• Piston, ring, and connecting rod tolerances.
• Fuel system tuning for the Linkert carburetors used during this period.

Transmission and Drivetrain

• Detailed breakdown of the 4-speed hand-shift and foot-shift transmissions.
• Dry clutch adjustments and sprocket alignment.
• Step-by-step procedures for stripping the transmission for major overhaul.

Electrical and Ignition

Includes full wiring diagrams and troubleshooting for the 6-volt electrical systems. Learn the correct procedures for generator testing, regulator adjustments, and timing the manual-advance distributors to ensure reliable starting.

Model Identification and Serial Numbers

For correct parts ordering and authentication, this manual utilizes the Harley-Davidson engine production numbering system. Serial numbers are located on the left side of the engine crankcase.

• 1958 models begin with the prefix 58.
• 1959 models begin with the prefix 59.
• Example: 59FLH1000 (Model year, Model designation, and production number).

Comprehensive Table of Contents

• Section 1: General (Specifications, Tire Data, and Lubrication)
• Section 2: Engine (Design, Operating Principles, and Overhaul)
• Section 3: Transmission and Clutch (Disassembly and Reassembly)
• Section 4: Fuel System (Carburetor and Tank Maintenance)
• Section 5: Electrical System (Generator, Battery, and Wiring)
• Section 6: Chassis (Wheels, Hubs, Brakes, and Fork Service)

This manual is more than just a repair guide; it is a piece of Harley-Davidson history. Designed for clear reading on any device, the structured sections and factory diagrams allow you to execute professional-grade repairs with confidence. Preserve the legacy of your Duo-Glide or Servi-Car with the only manual used by factory-trained mechanics in the late 1950s.