Market Position:
The 1956 Harley-Davidson Servicar-SV represents a specialized utility vehicle, primarily aimed at commercial applications such as delivery services, police departments, and road maintenance. Its robust construction and the powerful Panhead engine made it a workhorse of its era. This manual targets owners, collectors, and mechanics dedicated to preserving or restoring these iconic machines.
Competitive Analysis:
While direct competitors were few in the purpose-built three-wheeled utility vehicle market, the Servicar-SV competed indirectly with smaller commercial vehicles and other motorcycle manufacturers offering specialized attachments. Its primary advantage was its inherent durability and the established reputation of Harley-Davidson.
Key Features:
Three-wheel configuration for stability and cargo capacity, robust Panhead V-twin engine, heavy-duty chassis, versatile for commercial use, iconic Harley-Davidson build quality.
Coverage Areas:
Complete service, repair, troubleshooting, and maintenance for the 1956 Harley-Davidson Servicar-SV.
Page Count:
Estimated 300-400 pages (typical for comprehensive factory service manuals of this era).
Manual Type:
Factory Service Manual / Repair Manual
Format:
Downloadable Digital Format (PDF)
Systems Covered:
Engine (Panhead OHV V-Twin), Carburetion, Ignition, Lubrication System, Fuel System, Exhaust System, Transmission (4-speed constant mesh), Clutch, Drive System (Shaft drive to rear axle, belt drive to sidecar wheel), Brakes (Drum brakes front and rear), Suspension (Front fork, rear swingarm with spring-oil shocks), Electrical System (Generator, battery, lighting, wiring harness), Frame, Sheet Metal, Bodywork, Sidecar Assembly, Controls, Wheels and Tires.
Procedures Included:
Routine maintenance (oil changes, lubrication, adjustments), Engine overhaul (top-end and bottom-end rebuilds), Carburetor tuning and rebuilding, Ignition system troubleshooting and repair, Clutch adjustment and replacement, Transmission disassembly and reassembly, Brake system servicing, Wheel bearing maintenance, Suspension component inspection and replacement, Electrical system diagnostics and repair, Wiring diagram interpretation, Frame inspection and repair, Sheet metal repair and alignment, Sidecar mounting and adjustment, Troubleshooting common issues, Specifications and data tables.
Technical Depth:
Comprehensive. Covers detailed disassembly, assembly, repair, and adjustment procedures for all major mechanical and electrical systems. Includes diagnostic charts and technical specifications for precision work. Suitable for professional mechanics and experienced DIY enthusiasts.
Engine Type:
4-stroke, OHV (Overhead Valve), Air-Cooled V-Twin 'Panhead'
Displacement:
74 cubic inches (1213 cc) - standard for this era's large Harley V-twins.
Bore X Stroke:
3.4375 in x 4.25 in (87.3 mm x 108.0 mm)
Compression Ratio:
Approximately 7.0:1
Horsepower:
Estimated 40-45 HP at 4800 RPM (actual figures often not precisely published for this variant).
Torque:
Estimated 65-70 lb-ft at 3000 RPM.
Carburetor:
Linkert M-series (e.g., M74B or similar).
Fuel Type:
Gasoline (Leaded fuel typical for the era, octane rating around 86-90).
Type:
Dry Sump with external oil tank.
Oil Capacity:
Approximately 4 U.S. quarts (3.8 liters) including filter and lines.
Type:
Battery and Coil (distributor ignition typically introduced later in the Panhead era, early models may have timer/points).
Type:
4-Speed Constant Mesh Manual Transmission.
Optional Transmission:
N/A for 1956 Servicar-SV.
Drive Type:
Shaft drive to rear axle, belt drive to sidecar wheel.
Clutch Type:
Wet multi-plate.
Gear Ratios:
Specific ratios detailed within the manual, designed for torque and load carrying.
Wheelbase:
Approximately 57 inches (1448 mm) for the motorcycle portion.
Length:
Varies significantly with sidecar, typically 90-100 inches (2286-2540 mm).
Width:
Varies with sidecar, typically 50-60 inches (1270-1524 mm).
Cargo Bed Dimensions:
Detailed in manual, typically a substantial utility bed designed for commercial loads.
Dry Weight:
Estimated 750-900 lbs (340-408 kg) depending on configuration.
Gross Vehicle Weight Rating:
Not explicitly rated in modern automotive terms, but designed to carry significant payload (estimated 500-750 lbs / 227-340 kg).
Crash Test Results:
N/A (Vehicles of this era were not subjected to standardized crash testing as understood today).
Active Features:
Drum brakes front and rear, rider control via handlebars and foot controls.
Passive Features:
Robust frame construction, rider seating position.
Infotainment System:
N/A. Basic functionality focused on transportation and utility.
Driver Assistance Features:
N/A.
Connectivity Features:
N/A.
Generator:
6-volt DC generator system, standard for the era.
Lighting:
Headlight, taillight, brake light, and possibly indicator lights depending on original specification.
Oil Change Interval:
Every 1,000-1,500 miles or seasonally. The manual will specify exact intervals and procedures.
Lubrication Points:
Multiple grease fittings requiring regular attention (e.g., steering head, wheel bearings, suspension pivots, clutch linkage). Detailed lubrication chart in manual.
Tune Up Interval:
Typically every 2,500-5,000 miles, involving spark plug inspection/replacement, ignition timing check, carburetor adjustment, and general inspection.
Engine Oil:
Harley-Davidson recommends SAE 50 or SAE 60 motor oil for air-cooled V-twins of this era. Specific viscosity may vary based on ambient temperature. Refer to manual for precise recommendations.
Transmission Oil:
Harley-Davidson recommends SAE 60 or SAE 70 gear oil. Check manual for specific GL rating if applicable.
Primary Chaincase Oil:
Typically a light lubricant or Harley-Davidson's dedicated primary oil. Capacity and type specified in manual.
Brake Fluid:
N/A (Drum brakes, likely dry system, no hydraulic fluid).
Known Issues:
Oil leaks (common on vintage Harley-Davidsons due to seal material and age), valve seat wear, carburetor tuning difficulties (Linkert carburetors can be finicky), generator charging issues, clutch slippage, kingpin wear in the steering mechanism.
Preventative Maintenance:
Regular cleaning of the oil pump screen, valve adjustments, diligent lubrication of all points, and careful clutch operation are crucial for longevity.
Brand Heritage:
Harley-Davidson, founded in 1903, is one of the most iconic American motorcycle manufacturers. Known for its V-twin engines and robust engineering, the brand has a rich history in both civilian and military applications.
Model Evolution:
The Servicar concept began in the 1930s, evolving through various engine and chassis designs. The SV designation typically refers to the single-cylinder models, but in this context, the 'SV' likely refers to the Servicar model line, which utilized the company's twin-cylinder engines. The 1956 model features the then-current Panhead engine, representing a significant technological advancement over earlier models.
Production Period:
Servicar models were produced for many decades, with the Panhead-equipped versions being popular in the 1950s and early 1960s. The 1956 model is part of the significant mid-century evolution of the Servicar.
