Husqvarna 440 Chainsaw Troubleshooting- How To Perform Perfectly?

by Jack Grover
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Are you wondering what are some of the problems you can face with a Husqvarna 440 chainsaw? Common issues include stalling, chain not moving at a good speed, etc. Each problem requires a different solution. For example, to solve speeding issues of the chain, you need to repair the clutch.

Husqvarna 440 chainsaw troubleshooting is a piece of cake if you know how to do it. If you’re not familiar with these issues, the solutions may look even more confusing. But don’t worry, because, in this article, we’ll be discussing everything you need to learn to fix your Husqvarna 440 chainsaw.

Husqvarna 440 Chainsaw Troubleshooting: Problems and Solutions

infographic for husqvarna 440 chainsaw troubleshooting

There are several types of problems you can face with Husqvarna 440 chainsaws. Some of these are easy to solve, while some are not. Let’s take a look at some common issues.

The engine won’t accelerateClean or wash the air filter
The engine dies after startingReplace the spark plug
Engine not idlingReadjust the carburetor
Excessive engine smokeUse the correct fuel mixture
Idling speed of the chainReplace the clutch

Check out the simple solutions to some common Husqvarna 440 chainsaw problems below.

Problem 1: Engine Won’t Accelerate

The key reason why the engine will not accelerate is a clogged air filter. A dirty air filter restricts proper airflow, preventing the engine from working. The air filter can get clogged if you haven’t cleaned it in a while. Sometimes, as a result of this, you will notice your Husqvarna chainsaw 440 won’t start.

Solution: The solution is very simple. All you have to do is clean or wash the air filter. If the filter. Follow the steps mentioned below.

  • Open the three latches in the cylinder cover with a screwdriver and remove it.
  • Pull the metal latch holding the air filter, preferably with a screwdriver.
  • Gently place the screwdriver in between the air filter and separate the upper and lower portion of it.
  • Use a clean brush to softly dust the dirt from the air filter. If it is too dirty, you can use soap and water to wash it.
  • Assemble the air filter and place it inside the chainsaw correctly and close the cylinder cover.

Now you have a clean air filter and a perfectly fine engine.

Problem 2: Engine Dies After Starting

A common problem in Husqvarna 440 chainsaw is that it will start fine, and suddenly it will stop working. This usually occurs due to a faulty spark plug. An incorrect ratio of air/fuel mixture will eventually ruin the spark plug. While fixing the air/fuel ratio is important, replacing the plug is the only solution here.

Solution: You can replace the faulty spark plug at home by yourself. You can make sure to use the right spark plug size for your Husqvarna.

However, simply follow the steps mentioned below.

  • Use a flathead screwdriver to unscrew the top cover of the machine.
  • Remove the rubber spark plug boot by pulling it.
  • Now place a ¾-inch socket wrench on the spark plug, turn counter-clockwise, and remove it.
  • Insert the newly bought spark plug, and use the socket wrench to place it firmly.
  • Replace the rubber spark plug boot. Give it a firm push so it will stay on top of the spark plug tightly.
  • Now screw on the top cover of the machine.

With this, the engine will run perfectly.

This Video Might Help When Engine Does not Crank!

Problem 3: Poor Engine Idling

One of many Husqvarna 440 chainsaw problems is engine idling. If the carburetor in the tool is not properly adjusted, then it will prevent the engine from idling. It usually happens when you use the machine for a very long time without taking care of maintenance. It can also happen if your machine sits in the box for a while.

Solution: You see, some Husqvarna 440 users from Arboristsite also suggest the same solution that literally worked for them.

Well, carburetor adjustment is not a critical process. Keep in mind that the readjustment process needs to be done while the machine is on. Otherwise, it is impossible to determine whether the saw is working properly or not.

By following the steps mentioned below, you can fix adjust the carburetor easily.

  • To start readjustment, find the L screw, then the T screw, and then the H screw located on the motor housing.
  • Now, take a flathead screwdriver, and turn the L screw clockwise. Keep turning it until the engine is barely running.
  • Now turn the L screw counter-clockwise, and keep doing so until you can feel that the engine is running very smoothly.
  • Squeeze the throttle trigger and ensure a smooth acceleration too.
  • Let’s move to T screw. Take a flathead screwdriver and keep turning the T screw clockwise until the chain is moving.
  • Turn the T screw counter-clockwise until the chain stops moving completely.
  • Take a flathead screwdriver, and turn the H screw counter-clockwise as long as possible. Don’t force it.
  • Now turn the H screw clockwise, and you will soon hear a purring noise from the engine, not a rough sound.

With these steps, your carburetor will be as good as factory adjusted aka new!

This Might Help in Carburetor Adjustment Too!

Problem 4: Excessive Engine Smoke

There is only one reason excessive smoke is coming out of your machine. The fuel mixture is not correct. If you are using too much oil and less gas, instead of the correct ratio, then this problem will keep happening.

Solution: The Husqvarna 440 chainsaw has a two-stroke engine. The rule of thumb here is to use a 50:1 fuel-to-oil ratio. If you are using 1 gallon of gas then you should be mixing 2.5 fluid ounces of oil. Here is how you can create the perfect fuel mix for your machine.

  • Take a clean and airtight container for the fuel. Dirty fuel containers are the number one cause of contamination and permeation.
  • Fill the container with half the gas.
  • Now add all the oil.
  • Gently shake for a few minutes to create a perfect emulsion of oil and gas.
  • Now add the remaining gas.

There you go. Now you have the ultimate fuel mix that will help your chainsaw perform at its maximum capacity.

Problem 5: Idling Speed Of Chain

If the chain of your machine moves at idle speed, then it is most likely because the clutch needs to be replaced. If the clutch is damaged, then you will frequently notice the poor movement of the chain. In this case, replacement is a better solution than repairing.

Solution: Replacing the clutch in a Husqvarna 440 chainsaw is not a difficult task. Here is how you can do that by yourself.

  • Spin the chain to make sure the brake has turned off. Now, you have released the chain break.
  • Remove bar nuts using a flathead screwdriver.
  • Locate the bar tensioner screw between the bar cover’s metal post. Now use a wrench to loosen it. Then remove the bar cover.
  • After that unplug the spark plug carefully.
  • Use a clutch socket wrench to turn the clutch bolts clockwise. Then take apart the clutch assembly.
  • Now remove the clutch cover, clutch spring, and clutch drum.
  • At this point, you can start reassembling the clutch with new parts. To do so, follow the steps in reverse.

Now the clutch is all new, and the chain will no longer have an idle speed.

This Video Might Help Too!

Frequently Asked Questions (FAQs)

Why does my Husqvarna chainsaw keep shutting off?

Your Husqvarna chainsaw keeps shutting off probably because the carburetor is clogged.

Why does my chainsaw start but won’t stay running?

If your chainsaw starts but doesn’t stay running, it is probably due to a damaged spark plug.

Why does my chainsaw dies when I give it gas?

A dirty fuel filter or the wrong fuel mixture can be the reason why your chainsaw dies when you give it gas.


If you have read through this write-up carefully, you will now be able to perform Husqvarna 440 chainsaw troubleshooting easily.

Chainsaws are heavy machinery. Even working with one, you have to follow safety procedures and wear safety gear. When you are repairing a part of your tool, you must use safety gear too.

Always turn off the machine before you start working on it. If a solution requires keeping the machine on, then do so with proper equipment. Whatever you do, don’t work on the chainsaw when it is hot. Opening up such tools right after using them can cause skin damage.

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