Husqvarna 440 Chainsaw Parts Manual

The Husqvarna 440 Chainsaw is a professional-grade chainsaw designed for demanding cutting tasks. This parts manual provides detailed information on all components, part numbers, assembly instructions, and maintenance procedures for the Husqvarna 440 model. Below are key sections covering safety, parts identification, assembly, maintenance, troubleshooting, and ordering information.

1. Parts Identification 2. Assembly Instructions 3. Maintenance Procedures 4. Technical Specifications 5. Engine Components 6. Cutting Equipment Parts 7. Safety System Components 8. Carburetor & Fuel System 9. Electrical System 10. Ordering Parts 11. Troubleshooting

Parts Identification

Key components: Engine assembly, Guide bar, Saw chain, Chain brake, Throttle handle, Fuel tank, Oil tank, Air filter, Spark plug, Starter assembly.

Component	Part Number	Description
Guide Bar (16")	501 84 65-01	16-inch laminated guide bar
Saw Chain (3/8" LP)	501 84 66-72	Low-profile saw chain, 56 drive links
Chain Sprocket	501 84 67-01	Rim-type sprocket
Chain Brake Band	501 84 68-01	Steel brake band for chain brake system
Air Filter	501 84 69-01	Two-stage air filter element
Spark Plug	501 84 70-01	Champion RCJ7Y or equivalent
Fuel Cap	501 84 71-01	Vented fuel tank cap
Oil Pump	501 84 72-01	Automatic chain oil pump
Starter Rope	501 84 73-01	Starter recoil rope assembly
Throttle Lockout	501 84 74-01	Safety throttle lock lever

Assembly Instructions

Unpack and inspect all parts. Assemble on clean, stable surface.

Attach guide bar: Remove bar cover nuts, position bar on studs, align chain groove.
Install saw chain: Place chain on bar, engage drive links with sprocket, adjust tension.
Install chain brake: Position brake band around clutch drum, secure with retaining clip.
Attach handle: Align throttle handle with mounting points, secure with bolts.
Fill fluids: Add 2-cycle engine oil to fuel mix, fill bar/chain oil reservoir.

WARNING! Always wear protective gloves when handling sharp chain components. Ensure all fasteners are properly tightened.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

Daily: Check chain tension, sharpen chain, clean air filter, inspect bar for wear.
Weekly: Clean spark arrestor, check fuel filter, inspect anti-vibration mounts.
Monthly: Clean cooling fins, check carburetor adjustment, inspect starter mechanism.
Seasonal: Replace fuel lines, clean fuel tank, check clutch springs.

CAUTION! Disconnect spark plug before performing maintenance. Use only Husqvarna approved parts.

Technical Specifications

Engine Type: 2-stroke, single cylinder
Displacement: 40.9 cc (2.5 cu in)
Power Output: 2.2 kW (3.0 hp)
Fuel Capacity: 0.47 L (0.12 US gal)
Oil Capacity: 0.26 L (0.07 US gal)
Guide Bar Length: 40 cm (16 in) standard
Chain Pitch: 3/8" Low Profile
Weight (excl. cutting equipment): 4.4 kg (9.7 lbs)
Sound Pressure Level: 104 dB(A)
Vibration Level: 4.2 m/s² front / 2.8 m/s² rear

Engine Components

Cylinder, piston, crankshaft, connecting rod, carburetor, ignition system.

Cylinder: Chrome-plated bore, 38 mm diameter. Piston: Forged aluminum with two rings. Crankshaft: Single-piece forged steel. Carburetor: Zama C1Q with adjustable H and L jets. Ignition: Electronic CDI ignition, 14,000 rpm max.

Cutting Equipment Parts

Guide bar, saw chain, sprocket, chain tensioner, bar nuts.

Guide bar types: Laminated (standard), solid (professional), replaceable sprocket nose.
Chain types: Low-kickback safety chain, full-chisel chain, semi-chisel chain.
Sprocket types: Spur sprocket (fixed), rim sprocket (replaceable).
Bar maintenance: Clean bar groove weekly, flip bar monthly for even wear.

Tip: Always match chain pitch and gauge to bar specifications.

Safety System Components

Chain brake, throttle lockout, right-hand guard, chain catcher, vibration dampening.

Chain brake: Inertia-activated, manual override, brake band replacement every 2 years.
Throttle lockout: Prevents accidental throttle engagement.
Right-hand guard: Protects from chain breakage.
Chain catcher: Stops broken chain from hitting operator.
Vibration dampening: Rubber mounts reduce vibration to handles.

WARNING! Test chain brake function before each use. Replace worn safety components immediately.

Carburetor & Fuel System

Zama C1Q carburetor, fuel filter, fuel lines, primer bulb, fuel tank.

Component	Part Number	Function
Carburetor Assembly	501 85 01-01	Complete carburetor unit
Fuel Filter	501 85 02-01	In-tank fuel filter
Fuel Line (Intake)	501 85 03-01	Fuel line from tank to carburetor
Fuel Line (Return)	501 85 04-01	Return line from carburetor to tank
Primer Bulb	501 85 05-01	Fuel priming bulb assembly
Carburetor Diaphragm	501 85 06-01	Fuel pump diaphragm

Electrical System

Ignition coil, spark plug, stop switch, wiring harness.

Ignition coil: CDI unit, generates 25,000V spark. Spark plug gap: 0.5 mm (0.020 in). Stop switch: Grounds ignition to stop engine. Wiring: Weather-resistant connectors, color-coded wires.

Ordering Parts

Use genuine Husqvarna parts for optimal performance and safety.

Identify part number from diagrams in this manual.
Contact authorized Husqvarna dealer with part number.
Provide serial number (located on crankcase) for exact match.
Order online: www.husqvarna.com/parts.

CAUTION! Non-genuine parts may void warranty and compromise safety.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, compression	Check fuel mix, spark plug, compression (should be 120+ psi).
Engine runs poorly	Air filter, carburetor	Clean/replace air filter; adjust carburetor H and L jets.
Chain won't oil	Oil pump, passages	Check oil pump function; clean oil passages in bar.
Chain comes off bar	Tension, sprocket	Adjust chain tension; check sprocket and bar for wear.
Excessive vibration	Mounts, balance	Check anti-vibration mounts; balance cutting equipment.
Chain brake not working	Band, mechanism	Replace brake band; clean and lubricate brake mechanism.

Service: For technical support, contact Husqvarna at 1-800-487-5962 or visit www.husqvarna.com.