Husqvarna 50 / 50 Special / 51 / 55 Chainsaw Service Manual
Diagnostic procedures and component service for the engine, fuel, ignition, and lubrication systems. Part Number: 531 03 00-76
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Sample pages from the Husqvarna 50 / 50 Special / 51 / 55 Chainsaw Service Manual manual
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Husqvarna Models Covered & Key Technical Specifications
Models: Husqvarna 50, 50 Special, 51, 55
Build Years: 1970s–1980s
Serial Numbers: 9250857 and up
Technical Data:
- Engine displacement: 49–53 cc (3.0–3.2 cu. in.)
- Maximum engine speed: 8400–9000 rpm
- Idling speed: 2500 rpm
- Clutch engagement speed: 3700 rpm
- Spark plug electrode gap: 0.5 mm (0.020 in.)
- Ignition air gap: 0.3 mm (0.012 in.)
- Flywheel nut torque: 25–30 Nm (18.4–22.1 ft.lbs.)
- Crankcase screw torque: 7–9 Nm (5.1–6.6 ft.lbs.)
- Weight (with 38 cm bar and chain): 6.2 kg (13.7 lb)
Husqvarna Manual Features & Content Preview
Technical Scope and Specifications
- Covers 1970s–1980s Husqvarna 50, 50 Special, 51, and 55 chainsaws, including detailed engine, fuel, and drivetrain configuration data
- Official Husqvarna publication 531 03 00-76
- Contains 58 pages of technical procedures including centrifugal clutch maintenance, ignition timing, and crankshaft seal replacement
- File link appears in your order confirmation straight away
- Laid out for standard letter and A4 printing
- This 58-page workshop manual provides the definitive assembly and identification data for the 50/51/55 series, essential for accurately maintaining these vintage professional-grade saws.
Document Coverage and Content
This factory workshop publication documents the maintenance and technical requirements for the Husqvarna 50, 50 Special, 51, and 55 series. The manual provides detailed insights into the ignition systems, recoil starters, and fuel delivery components unique to each model variant. Each chapter outlines component functionality and inspection criteria, focusing on precise torque values for crankshaft and cylinder assemblies. Users find data on internal wear limits for clutch shoes and brake bands, alongside specific setting requirements for the Walbro WA and WT carburetor units.
Maintenance and Technical Data Preview
Engine specifications detail displacement ranges from 49 cc to 53 cc, with standardized idle speeds of 2500 rpm. Flywheel retaining nut torque is specified at 25–30 Nm (18.4–22.1 ft.lbs.) in the ignition system section. Intake manifold and carburetor linkage adjustments are described to ensure consistent fast-idle operation on the 51 and 55 models. The technical data provided serves as a reference for maintaining the 12500 rpm no-load free speed limit. Detailed wear limits for the 0.80 mm brake band are documented for safety verification. Reference how factory workshop documentation is structured to streamline your service workflow.
All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official 58-page Husqvarna OEM workshop manual covering the 1970s–1980s 50, 50 Special, 51, and 55 models, documenting engine, chassis, ignition, and fuel system specifications for the professional-grade saw series.
Document Reference: Husqvarna publication 531 03 00-76
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