Husqvarna 440 X Torq Manual

The Husqvarna 440 X Torq is a professional-grade chainsaw featuring X-Torq engine technology for reduced fuel consumption and lower emissions, Smart Start for easy starting, Air Injection centrifugal air cleaning system, LowVib anti-vibration system, and an inertia-activated chain brake. This manual covers safety, features, assembly, operation, maintenance, and troubleshooting. Always read and understand the manual before use.

Features at a Glance

Key components: X-Torq engine, Guide bar, Saw chain, Front hand guard with chain brake, Throttle trigger, Stop switch, Fuel tank, Oil tank, Air filter cover, Starter handle.

Feature	Description
X-Torq Engine	Reduces fuel consumption and exhaust emissions
Smart Start	Easy starting system with decompression valve
Air Injection	Centrifugal air cleaning for longer filter life
LowVib System	Reduces vibration for operator comfort
Inertia Chain Brake	Automatically activates during kickback
Combined Stop/Choke Control	Simplified starting sequence
Side-mounted Chain Tensioner	Easy chain adjustment without tools
Quick-release Air Filter	Easy access for cleaning
Transparent Fuel Tank	Easy fuel level check
Chain Catcher	Safety feature to catch broken chain

Assembly & Preparation

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

1. Attach guide bar and chain: Place bar on studs, fit chain around sprocket and bar groove, tighten bar nuts finger-tight.
2. Tension chain: Use side-mounted tensioner to achieve proper tension (check with gloves on).
3. Fill fuel tank: Use Husqvarna 2-stroke oil mixed with unleaded gasoline (50:1 ratio).
4. Fill chain oil tank: Use Husqvarna chain oil or equivalent.
5. Install battery (if electric start model): Insert and secure battery.

WARNING! Always wear protective equipment: helmet, gloves, eye protection, hearing protection, and chainsaw chaps.

First-Time Operation

Before first start, perform pre-operation checks.

1. Check chain tension: Chain should be snug but pull freely around bar.
2. Check chain sharpness: Use properly sharpened chain only.
3. Check all fasteners: Ensure bar nuts, handles, and covers are secure.
4. Start engine: Place on ground, engage chain brake, set choke, pull starter cord.
5. Warm up: Allow engine to idle for 30 seconds before cutting.

CAUTION! Never start the chainsaw unless the chain brake is engaged and you're in a clear area.

Specifications

• Engine Displacement: 40.9 cc
• Power Output: 2.4 kW (3.2 hp)
• Fuel Tank Volume: 0.33 L (0.87 US pt)
• Oil Tank Volume: 0.26 L (0.55 US pt)
• Recommended Bar Length: 13" to 18" (33 cm to 45 cm)
• Chain Pitch: 3/8" or .325"
• Chain Gauge: 0.050" (1.3 mm)
• Weight (excluding cutting equipment): 4.7 kg (10.4 lbs)
• Sound Pressure Level: 106 dB(A)
• Vibration Level: Front handle: 3.5 m/s², Rear handle: 4.5 m/s²

Controls and Components

Main controls located on top and rear handle.

Right Side: Throttle trigger, Throttle trigger lockout, Stop switch, Choke control, Decompression valve (if equipped).

Left Side: Chain brake handle, Front hand guard, Chain tensioner, Side cover latch.

Rear: Rear handle with vibration dampeners, Fuel tank cap, Oil tank cap, Starter handle.

Operation: Squeeze throttle trigger lockout and throttle trigger to increase engine speed. Push front hand guard forward to engage chain brake.

Chain & Bar Setup

Proper chain installation and tensioning is critical for safety and performance.

1. Loosen bar nuts using combination wrench.
2. Rotate chain tensioner clockwise to loosen chain.
3. Place chain on bar with cutting teeth facing forward on top.
4. Position bar on studs, ensuring tensioning pin engages bar hole.
5. Tighten bar nuts finger-tight.
6. Tension chain: Rotate tensioner until chain is snug against bar (lift chain at center - drivers should not pull out of bar groove).
7. Tighten bar nuts securely (25-30 Nm torque).

Tip: Always check chain tension when chain is cold. Chain stretches when warm.

Starting & Stopping

Follow proper starting procedure to avoid injury.

Cold Start:

1. Engage chain brake by pushing hand guard forward.
2. Set stop switch to start position.
3. Press decompression valve (if equipped).
4. Set choke control to full choke.
5. Place saw on ground, foot in rear handle.
6. Pull starter cord until engine fires (1-3 pulls).
7. Set choke to half-throttle position.
8. Pull starter cord until engine starts.
9. Disengage chain brake before cutting.

Warm Start: Skip choke step; start at half-throttle position.

Stopping: Release throttle, press stop switch to stop position.

Maintenance Schedule

Interval	Maintenance Task
Daily	Check chain tension, sharpness, and lubrication
Daily	Clean air filter (more often in dusty conditions)
Weekly	Check all nuts and bolts for tightness
Weekly	Clean cooling fins and cylinder cover
Monthly	Clean spark arrestor screen (if equipped)
Seasonally	Replace spark plug (Husqvarna HDA-87 or equivalent)
Seasonally	Clean fuel filter and replace if necessary
Annually	Professional inspection and carburetor adjustment

CAUTION! Always disconnect spark plug wire before performing maintenance.

Storage & Transport

Proper storage prevents fuel system issues and corrosion.

1. Empty fuel tank or add fuel stabilizer.
2. Run engine until it stops to clear carburetor.
3. Remove chain, clean and oil it, store separately.
4. Clean entire saw, especially cooling fins.
5. Store in dry, cool place with bar and chain cover installed.
6. For transport: Engage chain brake, install scabbard over bar.

WARNING! Never store chainsaw with fuel in tank for more than 30 days without stabilizer.

Safety & Regulatory

Complies with ANSI B175.1 and EPA Phase 2 emissions standards. Contains FCC Part 15 Class B digital device. Always follow local regulations for chainsaw use and personal protective equipment. Copyright © 2025 Husqvarna AB. For support, visit www.husqvarna.com or contact 1-800-487-5962.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No spark, fuel, or compression	Check spark plug, fuel mix, decompression valve, choke setting
Engine starts then dies	Clogged fuel filter, dirty air filter	Replace fuel filter, clean air filter, check fuel lines
Poor cutting performance	Dull chain, improper tension	Sharpen chain, adjust tension, check bar groove
Chain doesn't stop when brake engaged	Worn brake band, dirty mechanism	Clean brake mechanism, replace brake band if worn
Excessive vibration	Unbalanced chain, loose components	Sharpen chain evenly, tighten all nuts and bolts
Chain throws oil	Overfilled oil tank, wrong oil viscosity	Use correct oil, fill to proper level, clean oil ports
Engine overheats	Dirty cooling fins, lean fuel mixture	Clean cooling fins, check carburetor adjustment

Reset: For electronic ignition models, disconnect spark plug wire for 30 seconds to reset system.

Service: 1-800-487-5962; www.husqvarna.com