The Husqvarna 440 Chainsaw is a professional-grade chainsaw designed for demanding cutting tasks. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the Husqvarna 440 model. Below are key sections covering safety, parts identification, assembly groups, ordering instructions, and maintenance part replacements.
Key components are illustrated in exploded-view diagrams with corresponding part numbers for accurate identification.
| Part Group | Description |
|---|---|
| Engine Assembly | Complete engine block with cylinder, piston, and crankshaft |
| Fuel System | Fuel tank, carburetor, fuel lines, and filter |
| Ignition System | Spark plug, ignition coil, and stop switch |
| Cutting Equipment | Guide bar, saw chain, sprocket, and chain brake |
| Air Filtration | Air filter, filter cover, and pre-cleaner |
| Starter Assembly | Recoil starter, pulley, and rope |
| Crankcase | Main housing with bearings and seals |
| Handle Assembly | Front and rear handles with anti-vibration mounts |
| Clutch & Drive | Centrifugal clutch and drive sprocket |
| External Covers | Side covers, top cover, and chain brake cover |
Detailed parts list for the 40.9cc, 2-stroke engine.
WARNING! Engine components are precision parts; use proper tools for disassembly/assembly.
Components for fuel delivery and mixture.
CAUTION! Ensure fuel lines are routed correctly to prevent leaks and engine damage.
Parts for the cutting attachment and chain drive.
Guide Bar: Husqvarna H30-72 (15"): Part # 501 87 74-01. Saw Chain: Husqvarna H30-72 (0.325" pitch, 0.050" gauge): Part # 501 87 75-01.
Sprocket (Rim Type): Part # 501 87 76-01. Chain Brake Assembly: Part # 537 33 47-01. Clutch Drum: Part # 503 87 77-01. Bar Nuts: Part # 501 87 78-01. Chain Tensioner: Part # 501 87 79-01.
Components for engine air intake and filtration.
Tip: Clean air filter regularly for optimal engine performance and longevity.
Parts for the manual recoil starter.
WARNING! The starter spring is under tension; wear safety glasses during service.
Gaskets, seals, and bearings for the engine block.
| Part | Part Number | Qty |
|---|---|---|
| Cylinder Gasket | 503 87 88-01 | 1 |
| Crankcase Gasket | 503 87 89-01 | 1 |
| Crankshaft Seal (Flywheel Side) | 503 87 90-01 | 1 |
| Crankshaft Seal (Clutch Side) | 503 87 91-01 | 1 |
| Main Bearing (6202 C3) | 501 87 92-01 | 2 |
| Connecting Rod Bearing | 501 87 93-01 | 1 |
Parts for operator control and comfort.
Front Handle: Part # 537 33 50-01. Rear Handle with Trigger: Part # 537 33 51-01. Anti-Vibration Mounts (Set of 4): Part # 501 87 94-01. Handle Spacers: Part # 501 87 95-01. Throttle Trigger: Part # 501 87 96-01. Throttle Lockout: Part # 501 87 97-01.
Use the part numbers listed. Contact authorized Husqvarna dealers or visit the official parts website.
CAUTION! Use only genuine Husqvarna parts to ensure safety, performance, and warranty coverage.
| Symptom / Part | Indication for Replacement | Recommended Part Number |
|---|---|---|
| Loss of power / compression | Worn piston rings or cylinder scoring | Piston Kit: 537 33 40-02 |
| Hard starting / no spark | Faulty spark plug or ignition coil | Spark Plug: Champion RCJ7Y; Coil: 503 87 71-01 |
| Fuel leakage | Cracked fuel lines or tank | Fuel Line: 501 87 68-01; Tank: 537 33 44-01 |
| Excessive vibration | Worn anti-vibration mounts | Mount Kit: 501 87 94-01 |
| Chain won't stay tight | Worn drive sprocket or bar | Sprocket: 501 87 76-01; Bar: 501 87 74-01 |
Service Interval: Refer to the Operator's Manual for regular maintenance schedules.
Support: Husqvarna Customer Service: 1-800-487-5962; www.husqvarna.com/us/support