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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Document Details

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Document Number / Seller:
23704 / Robert Williams
File Size:
5.46 MB
File Type:
PDF
Language:
English
Pages:
58
Printable:
Yes
Category:
Chainsaw
Last updated / verified
Jan 25, 2025

Models Covered & Key Technical Specifications

Applied Factory Field Manual: Chainsaw Husqvarna 50 / 50 Special / 51 / 55 Chainsaw Service Manual Maintenance-Registry Husqvarna 50, 50 Special, 51, 55 (531 03 00-76) — 1970s–1980s Engineering Dossier for Chainsaw / Overview Resource Set. Reference Fastening Values: 49–53 cc (3.0–3.2 cu. in.) establishes the engine displacement cylinder volume Sequences. Integral Threaded Fastener Data: For optimal combustion, 0.5 mm (0.020 in.) defines the electrode gap across all spark plug models Baseline. General System Fill: Maximum engine rpm is standardized to 8400–9000 at full throttle Requirements. Essential Power Framework: The ignition air gap corresponds to 0.3 mm (0.012 in.) for proper module alignment Threshold. Baseline Throughput Data: Fuel tank capacity yields 1.5–5.2 L (0.058–11.5 pint) operational range Mapping. Established Output Density: The saw weight is established at 6.2 kg (13.7 lb) for standard 38 cm guide bar assembly Configuration.

Professional Workshop Service Manual & Technical Specifications

Applied Factory Field Manual: Chainsaw Husqvarna 50 / 50 Special / 51 / 55 Chainsaw Service Manual Maintenance-Registry

Model-Portfolio: Husqvarna 50 / 50 Special / 51 / 55 (531 03 00-76) // Component-Focus: Chainsaw / Engine Logic // Asset-ID: 1970s–1980s. Thoroughly demanding engine repair procedures are documented for all major systems. Maintenance hierarchies are structured into the following sections: Diagnostic procedures are covered for the ignition system, including spark plug and air gap adjustments. Wiring diagrams are provided for the ignition system, ensuring proper electrical connections. Fuel system procedures are documented for the carburetor and fuel tank, including ventilation and filter replacement. Adjustment procedures are detailed for the carburetor's low, high speed, and idle settings. Timing procedures are documented for the ignition module and flywheel installation.

Specification Diagnostic-Logic Calibration-Spec
Engine Displacement 49-53 cc N/A
Max Power Speed 8400-9000 RPM N/A
Fuel Tank Capacity 1.5-5.2 Liters N/A
Oil Tank Capacity 0.3 Liters N/A
Bar Length 37-49 cm N/A
Weight (w/o bar & chain) 5.2 kg N/A

FAQ

Reference the **required** tool specifications for disassembly. keyboard_arrow_down

Part number 5025022-01 is required for removing the cylinder with the 8 mm T-handle wrench.

What are the **essential** electrical values for the ignition system? keyboard_arrow_down

0.3 mm (0.012 in.) is the air gap specification for the ignition module and flywheel magnets.

Specify the **correct** calibration settings for the carburetor. keyboard_arrow_down

For idle speed, adjust screw 'T' to achieve 2500-2800 rpm; the saw chain must not rotate at engine idle.

What is the **documented** clearance measurements for the spark plug? keyboard_arrow_down

0.5 mm (0.020 in.) is the specified electrode gap for Champion RCJ7Y and NGK BPMR6A spark plugs.

Calculate the **precise** torque specifications for reassembly. keyboard_arrow_down

25-30 Nm (18.4-22.1 ft.lbs.) torque is specified for tightening the flywheel retaining nut.

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This manual is a must-have for anyone working with Husqvarna chainsaws. The detailed instructions and clear illustrations make troubleshooting a breeze. Plus, the download process was seamless, and I received my link almost instantly. Highly recommend!