Husqvarna 440 Parts Manual

The Husqvarna 440 is a professional-grade chainsaw designed for demanding forestry and arborist work. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the Husqvarna 440 chainsaw, including the engine, cutting equipment, fuel system, ignition system, and chassis. Below are key sections for identification, engine parts, cutting attachment, fuel system, ignition system, and maintenance parts.

Identification & Serial Number

Locate the model and serial number plate on the rear of the saw, near the handle. This information is required for ordering correct parts.

Component	Description
Model Number	440 (Type 1, 2, etc. as specified on plate)
Serial Number	Unique identifier for manufacturing date and batch
Engine Type	2-stroke, air-cooled, single cylinder
Displacement	40.9 cc (2.5 cu. in.)
Power Output	2.4 kW (3.2 hp)

IMPORTANT! Always provide the full model and serial number when ordering parts to ensure compatibility.

Engine Assembly & Cylinder

Complete breakdown of the engine block, piston, cylinder, crankshaft, and bearings.

1. Cylinder: Includes cylinder, decompression valve, and mounting bolts.
2. Piston Assembly: Piston, piston rings, wrist pin, and circlips.
3. Crankshaft: Complete crankshaft with integrated connecting rod.
4. Bearings & Seals: Main bearings, crank seals, and gaskets.
5. Crankcase: Upper and lower halves with screws and dowels.

WARNING! Engine disassembly requires specialized tools and knowledge. Refer to service manual for procedures.

Cutting Attachment & Bar

Parts for the guide bar, chain, sprocket, and clutch assembly.

• Guide Bar: Various lengths (13", 15", 16", 18") .050" or .058" gauge.
• Saw Chain: 3/8" LP pitch, .050" gauge, number of drive links varies by bar length.
• Sprocket: Rim sprocket (3/8" LP) and drum assembly.
• Clutch: Centrifugal clutch assembly, springs, and drum.
• Bar Mounting: Nuts, washers, and tensioning system components.
• Chain Brake: Band, handle, and activation mechanism parts.

Fuel System & Carburetor

Components for the fuel tank, lines, filter, and carburetor.

Part	Part Number Example	Function
Fuel Tank	537 27 41-01	Polyethylene tank with integrated cap
Fuel Filter	501 87 65-01	In-tank filter
Fuel Lines	537 23 31-02	Supply and return hoses
Carburetor (Zama C1Q)	545 01 42-02	Complete assembly
Carburetor Kit	530 03 58-01	Diaphragms, gaskets, needle valve
Impulse Line	501 87 68-01	Connects crankcase to carburetor

Tip: Replace fuel lines and filter annually to prevent running issues.

Ignition System & Electronics

Parts for starting and controlling the engine spark.

1. Ignition Module (Coil): Generates spark for the plug.
2. Spark Plug: Champion RCJ7Y or equivalent.
3. Stop Switch: Handle-mounted switch assembly.
4. Wiring Harness: Connects switch, coil, and ground.
5. Flywheel & Magneto: Includes key and fan.

CAUTION! Disconnect the spark plug boot before performing any maintenance.

Chassis & Handle Assembly

Structural components, handles, and anti-vibration elements.

Main Handle: Rear handle with trigger and throttle lockout.

Front Handle: Top handle with vibration dampeners.

AV Mounts: Rubber anti-vibration buffers and springs.

Side Covers: Right and left side covers (clutch and flywheel).

Chain Catch: Metal guard to protect operator.

Fasteners: All screws, nuts, and washers for assembly.

Air Filtration System

Components to ensure clean air intake for the engine.

1. Turn off saw and allow to cool before servicing air filter.
2. Air Filter: Foam or felt filter element.
3. Filter Cover: Plastic cover with locking tabs.
4. Pre-Filter: Fine mesh layer (if equipped).
5. Intake Manifold: Connects filter to carburetor.

WARNING! A dirty air filter is a common cause of power loss and engine damage. Clean regularly.

Starter Assembly

Parts for the recoil starter mechanism.

• Starter Housing: Plastic assembly with pulley.
• Starter Rope: Nylon rope with handle.
• Rewind Spring: Clock spring for rope retraction.
• Pulley & Pawls: Engagement mechanism parts.
• Spring Guide & Screws: Mounting hardware.

Maintenance & Replacement Kits

Common kits for routine service.

Kit Name	Contents	Application
Basic Maintenance Kit	Air filter, spark plug, fuel filter	Annual tune-up
Carburetor Repair Kit	Diaphragms, gaskets, needle, filter screen	Carburetor overhaul
AV Buffer Kit	Complete set of anti-vibration mounts	Vibration reduction service
Seal & Gasket Kit	Crank seals, cylinder gasket, intake gasket	Engine reseal

Torque Specifications

Critical fastener torque values for safe reassembly.

Cylinder Bolts: 10 Nm (88 in-lb)

Clutch Nut: 40-50 Nm (30-37 ft-lb) - Left-hand thread

Flywheel Nut: 35-40 Nm (26-30 ft-lb)

Spark Plug: 25-30 Nm (18-22 ft-lb)

Guide Bar Nuts: 8-10 Nm (71-88 in-lb)

Handle Mounting Screws: 8-10 Nm (71-88 in-lb)

CAUTION! Use a torque wrench. Overtightening can strip threads; undertightening can cause failure.

Parts Ordering & Support

Issue	Guidance	Contact / Resource
Identifying a part	Use the illustrated diagrams in the full manual. Match the reference number.	Refer to Section 2 for model/serial info.
Ordering parts	Contact an authorized Husqvarna dealer with part numbers.	Locate dealer: www.husqvarna.com/dealer-locator
Technical questions	Consult the official Husqvarna 440 Service Manual for procedures.	Document 965 97 00-01
Warranty claims	Have proof of purchase and serial number ready.	Contact dealer or Husqvarna Customer Support.
Safety information	Always read the operator's manual before use.	Download from Husqvarna website.

Support: Husqvarna USA: 1-800-487-5962; International: www.husqvarnagroup.com