Husqvarna 340 - User Manual

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340/345/350

CRAFTSMAN 359.35274

Operator's manual (CARB, EPA)

Please read these instructions carefully and make

sure you understand them before using the saw,

101 90 07-95

Other manuals for Husqvarna 340

Workshop Manual52 pages

Basic Adjustment4 pages

Questions and Answers:

J
Julie JonesSep 12, 2025
What to do if Husqvarna 340 Chainsaw will not run at full throttle?
- C
  Cynthia FosterSep 12, 2025
  If your Husqvarna Chainsaw won't run at full throttle, consider the following: * Adjust the H screw. * Check for a blocked air filter, fuel tank vent, or fuel filter. * Ensure the fuel line isn't blocked or damaged. * Inspect the impulse channel for leaks or blockages. * Look for a loose cover on the carburettor pump side or a faulty pump diaphragm. * Examine the air intake hose for leaks and ensure the carburettor mounting bolts are tight. * Verify the needle valve isn't set too low and the metering system is correctly assembled. * Check for a blocked silencer. * Also, the control diaphragm/cover plate might be leaking, the needle valve assembly could be sticking, or the metering system may be damaged.
I
iodonnellSep 9, 2025
Why does the L screw require constant adjustment on my Husqvarna 340?
- K
  kristasuarezSep 9, 2025
  If the L screw on your Husqvarna Chainsaw requires constant adjustment, it could be due to a blocked fuel line, a needle valve set too high, a needle valve assembly sticking, a leak in the metering system, a leaking control diaphragm/cover plate, faulty diffuser jets, or a crankcase leaking.
V
Vanessa RobinsonSep 8, 2025
What causes over rich acceleration in my Husqvarna Chainsaw?
- M
  Melissa GreenSep 8, 2025
  If your Husqvarna Chainsaw is running with over rich acceleration, it may be necessary to adjust the L and H screws. Other possible causes include a blocked air filter, a faulty pump diaphragm, or faulty diffuser jets.
T
Timothy CookeSep 7, 2025
What causes my Husqvarna 340 to not idle?
- M
  mary20Sep 7, 2025
  If your Husqvarna Chainsaw will not idle, consider these possible causes: Adjust the L screw. Also check for a leaking air intake hose, loose carburettor mounting bolts, a loose or faulty fuel hose, a blocked fuel filter, a blocked fuel line, a blocked fuel tank vent, a stiff throttle valve pivot, a sticking throttle pushrod, a defective throttle return spring, a bent throttle stop, or a faulty diffuser jet.
A
Andrea StewartAug 23, 2025
How to fix Husqvarna Chainsaw that has difficulty starting?
- S
  Sergio MasonAug 23, 2025
  If you're experiencing difficulty starting your Husqvarna Chainsaw, several factors could be the cause. Try the following: * Adjust the L screw. * Check if the air filter is blocked. * Ensure the choke is working correctly. Look for a worn choke pivot or valve. * Inspect the fuel system for a blocked fuel filter or fuel line. * Examine the piston ring for seizing and the impulse channel for blockages.
W
Wayne WalkerSep 5, 2025
Why does the L screw on my Husqvarna 340 Chainsaw require constant adjustment?
- D
  donald59Sep 5, 2025
  If the L screw on your Husqvarna Chainsaw requires constant adjustment, consider these potential causes: * Check for a blocked fuel line. * Ensure the needle valve is not set too high and that the needle valve assembly isn't sticking. * Inspect for leaks in the metering system or a leaking control diaphragm/cover plate. * Look for faulty diffuser jets or crankcase leaks.
H
Heather BrownSep 4, 2025
Why is my Husqvarna 340 Chainsaw idling too rich?
- A
  Angel HernandezSep 4, 2025
  If your Husqvarna Chainsaw is idling too rich, try the following: * Adjust the L screw. * Check for a worn needle valve or needle valve lever. * Ensure the needle valve is not set too high and that the needle valve assembly is not sticking. * Inspect for a leaking control diaphragm or cover plate.
R
Robert CordovaSep 3, 2025
Why is my Husqvarna 340 Chainsaw idling uneven?
- N
  Nicholas BergerSep 3, 2025
  Uneven idling in your Husqvarna Chainsaw can stem from several issues. Here's what to check: * Fuel supply: Look for a blocked fuel filter or fuel line. * Air leaks: Inspect the air intake hose for leaks and ensure carburettor mounting bolts are tight. * Throttle components: Check for a worn throttle valve pivot, loose throttle valve screw, or a worn throttle valve. * Carburettor issues: See if the needle valve assembly is sticking, there's a leak in the metering system, the metering system center knob is worn, or there's a hole in the diaphragm or leaking control diaphragm/cover plate. * Other: Check for crankcase leaks.
C
Charles WaltonSep 1, 2025
What to do if my Husqvarna 340 Chainsaw will not idle?
- B
  Brian McdonaldSep 1, 2025
  If your Husqvarna Chainsaw will not idle, consider the following: * Adjust the L screw. * Check for a leaking air intake hose. * Ensure the carburettor mounting bolts are not loose. * Inspect the fuel hose for leaks or faults. * Check for blocked fuel filter, fuel line, or fuel tank vent. * Look for a stiff throttle valve pivot or a sticking throttle pushrod. * Examine the throttle return spring for defects and the throttle stop for bending. * Check for a faulty diffuser jet.
J
James MoralesSep 1, 2025
What to do if Husqvarna 340 engine stalls when throttle released?
- M
  mwilliamsSep 1, 2025
  If your Husqvarna Chainsaw engine stalls when the throttle is released, try adjusting the L and H screws. It could also be due to a faulty pump diaphragm, a needle valve set too high, a sticking needle valve assembly, or faulty diffuser jets.

Husqvarna 340 Specifications

General

Cylinder Displacement	40.8 cm³
Weight	4.7 kg
Fuel Tank Volume	0.5 liters
Oil Tank Volume	0.25 liters
Chain Pitch	3/8"
Bar Length	33-40 cm / 13-16 in

Summary

SAFETY INSTRUCTIONS

Personal Protective Equipment

Chain Saw Safety Equipment

Chain Brake and Front Hand Guard

Throttle Lock and Other Safety Devices

Inspecting Safety Equipment

Guidance on checking and maintaining safety features for safe operation.

Cutting Equipment Safety

Rules for choosing, maintaining, and using cutting equipment to minimize kickback.

Kickback Avoidance and Techniques

Definition of kickback and techniques to avoid it, including safe cutting practices.

General Safety and Operation

ASSEMBLY

Mounting Guide Bar and Chain

FUEL HANDLING

Fuel Mixing and Fuelling

Instructions for mixing fuel, selecting oil, and safe fuelling procedures.

START AND STOP

Starting Procedures

Step-by-step guides for starting cold and warm engines.

Stopping Procedure

Procedure for safely stopping the chain saw engine.

MAINTENANCE

Carburetor and Air Filter Maintenance

Spark Plug and Lubrication System Maintenance

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