Husqvarna 55 Chainsaw Parts Manual

The Husqvarna 55 is a professional-grade chainsaw known for its reliability and performance in demanding cutting tasks. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the Husqvarna 55 chainsaw, including the engine assembly, cutting equipment, fuel system, ignition system, and housing. Below are key sections for identification, engine parts, cutting attachments, maintenance parts, and ordering.

1. Model Identification & Specifications 2. Safety Parts & Labels 3. Engine Assembly Parts 4. Cylinder & Piston Group 5. Fuel System Parts 6. Ignition System Parts 7. Cutting Equipment Parts 8. Chain Brake & Clutch Parts 9. Housing & Handle Parts 10. Maintenance & Replacement Kits 11. Parts Ordering & Support

Model Identification & Specifications

Identify your Husqvarna 55 using the serial number plate located on the rear housing. Key specifications for part compatibility.

Feature	Description
Model Series	Husqvarna 55 (including 55 Rancher variants)
Engine Displacement	54.3 cc (3.3 cu. in.)
Power Output	3.2 hp
Fuel Tank Capacity	0.55 L (18.6 fl. oz.)
Oil Tank Capacity	0.3 L (10.1 fl. oz.)
Recommended Bar Length	13" to 20" (33 cm to 51 cm)
Chain Pitch	0.325" or 3/8"
Chain Gauge	0.050" or 0.058"
Ignition Type	Electronic (SEM or Bosch)
Weight (Powerhead)	5.4 kg (11.9 lbs)

Safety Parts & Labels

Critical safety components and warning decals. Replace if damaged or illegible.

Chain Brake Band & Handle: Part # 501 87 65-01.
Front Hand Guard: Part # 501 59 63-01.
Right & Left Safety Labels: Part #s vary by region.
Chain Catcher: Part # 501 87 66-01.
Throttle Lockout Lever: Part # 501 59 62-01.

WARNING! Never operate the chainsaw with missing, damaged, or non-functional safety parts. Serious injury or death can occur.

Engine Assembly Parts

Crankcase, crankshaft, bearings, seals, and associated hardware.

Crankcase (Complete): Part # 501 83 10-03.
Crankshaft Assembly: Part # 501 83 11-05.
Main Bearings (2 required): Part # 501 83 12-01.
Crankcase Seals (Set): Part # 501 83 13-02.
Cylinder Base Gasket: Part # 501 83 14-01.
Engine Mounting Bolts (Set): Part # 501 83 15-01.

CAUTION! Engine disassembly requires specialized tools and knowledge. Consult a qualified technician.

Cylinder & Piston Group

Cylinder: Part # 501 83 20-04 (Includes decompression valve port).
Piston: Part # 501 83 21-02 (54.3mm diameter).
Piston Rings (Set): Part # 501 83 22-01.
Wrist Pin: Part # 501 83 23-01.
Circlips (2): Part # 501 83 24-01.
Cylinder Head: Part # 501 83 25-01.
Spark Plug: NGK BPMR7A or equivalent.
Decompression Valve: Part # 501 83 26-01.

Fuel System Parts

Carburetor, fuel lines, filter, tank, and caps.

Carburetor: Zama C1Q-S267 or Walbro HDA-120. Includes: Diaphragm Kit (Part # 501 83 30-01), Gasket Kit (Part # 501 83 31-01).

Fuel Tank: Part # 501 83 32-02. Fuel Cap: Part # 501 83 33-01. Fuel Line: Part # 501 83 34-01 (Internal). Fuel Filter: Part # 501 83 35-01. Impulse Line: Part # 501 83 36-01. Choke Lever/Knob: Part # 501 83 37-01.

Ignition System Parts

Ignition coil, flywheel, spark plug wire, stop switch.

Turn off chainsaw and disconnect spark plug before servicing.
Match part numbers to your specific serial number range.
Check air gap between coil legs and flywheel (0.2-0.3 mm).

Key Parts: Ignition Coil (SEM): Part # 501 83 40-02. Flywheel: Part # 501 83 41-03. Spark Plug Boot: Part # 501 83 42-01. Stop Switch: Part # 501 83 43-01. Wiring Harness: Part # 501 83 44-01.

Cutting Equipment Parts

Guide bar, chain, drive sprocket, bar nuts, and clutch.

Guide Bar (18"): Part # 501 83 50-01 (Husqvarna K095 mount).
Saw Chain (18", 0.325" pitch, 72 drive links): Part # 501 83 51-01.
Drive Sprocket (Rim type, 7 tooth): Part # 501 83 52-01.
Clutch Drum/Sprocket Rim: Part # 501 83 53-01.
Bar Nuts (Set): Part # 501 83 54-01.
Chain Tensioner Screw: Part # 501 83 55-01.
Bar Plate/Spacer: Part # 501 83 56-01.
Chain Sprocket Cover: Part # 501 83 57-01.

WARNING! Always use matched, sharpened, and properly tensioned cutting equipment. Wear protective gear.

Chain Brake & Clutch Parts

Internal clutch, brake band, spring, and activation mechanism.

Component	Part Number	Description
Clutch Assembly	501 83 60-02	Centrifugal clutch with shoes
Chain Brake Band	501 83 61-01	Steel band for stopping chain
Brake Spring	501 83 62-01	Return spring for brake handle
Brake Lever/Pawl	501 83 63-01	Activation mechanism
Clutch Drum Bearing	501 83 64-01	Needle bearing for drum
Brake Flag Spring	501 83 65-01	Spring for front hand guard

Housing & Handle Parts

Rear housing, front handle, anti-vibration elements, and covers.

Rear Housing (Complete): Part # 501 83 70-05. Front Handle: Part # 501 83 71-02. Anti-Vibration Springs (Set): Part # 501 83 72-01. Top Cover: Part # 501 83 73-01. Starter Housing: Part # 501 83 74-03. Air Filter Cover: Part # 501 83 75-01. Handlebar Screws: Part # 501 83 76-01.

Maintenance & Replacement Kits

Common service kits for routine maintenance.

Overhaul Gasket Set: Part # 501 83 80-01 (Includes all base gaskets, seals).
Fuel System Rebuild Kit: Part # 501 83 81-01 (Lines, filter, carb diaphragms).
Air Filter Kit: Part # 501 83 82-01 (Filter, cover gasket).
Chain Brake Service Kit: Part # 501 83 83-01 (Band, spring, lever).
Starter Rebuild Kit: Part # 501 83 84-01 (Rope, spring, pulley).
Bar & Chain Combo (18"): Part # 501 83 85-01.

Parts Ordering & Support

Use the part numbers listed. Always provide your chainsaw's serial number when ordering.

Step	Action	Notes
1. Identify Part	Use manual diagrams and part numbers.	Cross-reference with serial number.
2. Contact Dealer	Locate an authorized Husqvarna dealer.	Use dealer locator at husqvarna.com.
3. Provide Info	Give model (55), serial number, and part number.	Serial number is key for correct parts.
4. Verify Part	Confirm part matches before installation.	Compare with old part.
5. Installation	Follow service manual or use qualified technician.	Improper installation can cause failure.

Support: Husqvarna USA: 1-800-487-5962; www.husqvarna.com/us/support. International: Contact your local Husqvarna subsidiary.