340 Husqvarna Chainsaw Manual

The Husqvarna 340 is a professional-grade chainsaw designed for demanding forestry and arborist work. It features a powerful X-Torq engine for reduced emissions and fuel consumption, combined with LowVib anti-vibration system, air injection cleaning system, and inertia-activated chain brake. Below are key sections for safety, features, operation, maintenance, troubleshooting, and technical specifications.

Features at a Glance

Key components: X-Torq engine, LowVib system, Air Injection, Combined choke/stop control, Inertia activated chain brake, Side-mounted chain tensioner.

Safety Instructions

Read and understand all instructions before operation. Always wear proper PPE.

1. Personal Protective Equipment (PPE): Always wear chainsaw protective trousers, safety boots, gloves, eye protection (visor/goggles), and hearing protection.
2. Work Area Safety: Keep bystanders and animals at least 15 meters away. Ensure secure footing. Never operate on a ladder or unstable surface.
3. Fuel Safety: Refuel outdoors only, with engine stopped and cool. Use clean, fresh fuel mix (50:1 Husqvarna XP+ oil with 90+ octane gasoline). Wipe off spills.
4. Kickback Zone: Be aware of the upper quadrant of the guide bar nose. Never cut with this part of the bar.
5. Chain Brake: Test function before each use by pushing forward on front hand guard.

WARNING! Failure to follow safety instructions can result in serious injury or death. The chainsaw is a dangerous tool if misused.

Assembly & Preparation

Unpack and inspect contents. Assemble guide bar and chain.

1. Mount Guide Bar & Chain: Place bar on studs, fit chain with drive links in bar groove and cutting teeth facing forward on top. Adjust tension.
2. Fill Fluids: Add fuel mix to fuel tank. Add Husqvarna chain oil to oil tank.
3. Check Controls: Ensure throttle trigger, throttle lockout, stop switch, and chain brake function correctly.
4. Check Chain Tension: Chain should be snug against bar but pull freely by hand. Re-tension when cold.

CAUTION! Always use correct fuel mix. Never use straight gasoline or automotive oil.

Technical Specifications

• Model: Husqvarna 340
• Engine Displacement: 40.9 cc
• Power Output: 2.0 kW (2.7 hp)
• Max Recommended Bar Length: 16" (40 cm)
• Fuel Consumption: Approx. 470 g/kWh
• Idle Speed: 2700 rpm
• Max Power Speed: 9600 rpm
• Ignition System: Electronic, SEM
• Spark Plug: Champion RCJ7Y or equivalent, gap 0.5 mm (0.020")
• Carburetor: Walbro HDA-175
• Chain Oil Pump: Automatic, adjustable

Controls and Components

Main components: Front handle with chain brake, Rear handle with throttle trigger, Throttle lockout, Stop switch, Choke control, Decompression valve (if equipped), Side-mounted chain tensioner.

Controls:

• Throttle Trigger: Controls engine speed. Release to idle.
• Throttle Lockout: Must be depressed to allow throttle operation. Safety feature.
• Stop Switch: Move to STOP position to stop engine.
• Combined Choke/Stop Control: Pull out for cold start (choke). Push in past stop for engine stop.
• Chain Brake/Front Hand Guard: Push forward manually to engage brake, or inertia-activated by kickback.
• Chain Tensioner: Screw located by bar nuts. Turn to adjust chain tension.

Starting & Stopping Procedure

Cold Start:

1. Place saw on firm, flat ground. Engage chain brake.
2. Activate decompression valve (if equipped).
3. Set choke control to full choke position.
4. Press purge bulb (if equipped) 5-6 times until fuel is visible.
5. Hold saw firmly, place right foot through rear handle. Pull starter cord briskly 2-3 times until engine fires.
6. Move choke control to half-throttle position. Pull starter cord until engine starts.
7. Blip throttle to disengage fast idle. Release chain brake.

Warm Start: Do not use choke. Use half-throttle position.

Stopping: Release throttle, allow to idle briefly, move stop switch to STOP.

Basic Operation & Cutting Techniques

Always use full throttle when cutting. Maintain secure grip with both hands.

1. Felling: Plan escape path. Make notch cut (1/3 of tree diameter), then felling cut. Use wedges if needed.
2. Limbing: Work from trunk outwards. Support saw with trunk. Beware of spring-loaded branches.
3. Bucking (Cross-cutting): Support log. Cut from top. For logs under tension, cut compression side first.
4. Kickback Prevention: Hold saw firmly, do not overreach. Never cut with bar nose. Keep chain sharp and tensioned.

WARNING! Never operate chainsaw above shoulder height or with one hand.

Maintenance Schedule

Chain Sharpening & Tensioning

A sharp, properly tensioned chain is essential for safety and performance.

1. Tensioning: Loosen bar nuts. Turn tensioning screw clockwise until chain is snug against bar but can be pulled around by hand. Tighten bar nuts. Re-check tension when chain is warm.
2. Sharpening: Use correct round file size (typically 4.0 mm or 5/32"). Maintain 30° filing angle. File all cutters to equal length. File depth gauges with flat file to maintain correct height (0.65 mm / .025").

Tip: Sharpen chain frequently; a few strokes often is better than heavy filing when dull.

Storage Guidelines

For storage longer than 30 days:

1. Drain fuel tank and run engine until it stops to empty carburetor.
2. Remove chain and bar, clean, and coat with oil.
3. Clean entire saw, especially cooling fins and air filter.
4. Store in a dry, cool place, protected from dust.

CAUTION! Old fuel can cause starting problems and damage the engine. Always use fresh fuel mix.

Troubleshooting

Service: For repairs beyond basic maintenance, contact an authorized Husqvarna service dealer.

Support: Husqvarna AB, SE-561 82 Huskvarna, Sweden. www.husqvarna.com