WORKING TECHNIQUES / MAINTENANCE

How to avoid kickback

WARNING! Kickback can happen very

! suddenly and violently; kicking the chain saw, bar and chain back at the user. If this happens when the chain is moving it can cause very serious, even fatal injuries. It is vital you understand what causes kickback and that you can avoid it by taking care and using the right working technique.

What is kickback?

The word kickback is used to describe the sudden reaction that causes the chain saw and bar to jump off an object when the upper quadrant of the tip of the bar, known as the kickback zone, touches an object. (44)

Kickback always occurs in the cutting plane of the bar. Normally the chain saw and bar are thrown backwards and upwards towards the user. However, the chain saw may move in a different direction depending on the way it was being used when the kickback zone of the bar touched the object.

Kickback only occurs if the kickback zone of the bar touches an object. (45)

Limbing

WARNING! A majority of kickback

! accidents occur during limbing. Do not use the kickback zone of the guide bar. Be extremely cautious and avoid contacting the log, other limbs or objects with the nose of the guide bar. Be extremely cautious of limbs under tension. They can spring back toward you and cause loss of control resulting in injury.

Make sure that you can stand and move about safely.Work on the left side of the trunk. Work as close as possible to the chain saw for maximum control. If possible, let the weight of the chain saw rest on the trunk.

Keep the trunk between you and the chain saw as you move along the trunk.

Cutting the trunk into logs

See instructions under the heading Basic cutting technique.

General

The user must only carry out the maintenance and service work described in this manual. More extensive work must be carried out by an authorised service workshop.

Carburetor adjustment

Your Husqvarna product has been designed and manufactured to specifications that reduce harmful emissions.

Function

•The carburetor governs the engine’s speed via the throttle control. Air and fuel are mixed in the carburetor. The air/fuel mixture is adjustable. Correct adjustment is essential to get the best performance from the machine.

•The T-screw regulates the throttle setting at idle speed. If the T-screw is turned clockwise this gives a higher idle speed; turning it anti-clockwise gives a lower idle speed.

Basic settings and running in

The basic carburetor settings are adjusted during testing at the factory. Fine adjustment should be carried out by a skilled technician.

Rec. idle speed: See the Technical data section.

Fine adjustment of the idling speed T

Adjust the idle speed with the T-screw. If it is necessary to re-adjust, turn the T-screw clockwise while the engine is running, until the chain starts to rotate. Then turn counter- clockwise until the chain stops. A correctly adjusted idle speed setting occurs when the engine runs smoothly in every position. It should also be good margin to the rpm when the chain starts to rotate.

WARNING! Contact your servicing

! dealer, if the idle speed setting cannot be adjusted so that the chain stops at idle. Do not use the chain saw until it has been properly adjusted or repaired.

Checking, maintaining and servicing chain saw safety equipment

Note! All servicing and repair work on the machine requires special training. This is especially true of the machine′s safety equipment. If your machine fails any of the checks described below we recommend you to contact our servicing dealer. Any maintenance other than that described in this manual must be carried out by your servicing dealer (retailer).

Switch off the engine and take off the ignition cable before repairs or maintenance

Chain brake and front hand guard

Checking brake band wear

Brush off any wood dust, resin and dirt from the chain brake and clutch drum. Dirt and wear can impair operation of the brake. (46)

Regularly check that the brake band is at least 0.024 inch (0.6 mm) thick at its thinnest point.

Checking the front hand guard

Make sure the front hand guard is not damaged and that there are no visible defects such as cracks.

Move the front hand guard forwards and back to make sure it moves freely and that it is securely anchored to the clutch cover. (47)

5451546-92 Rev.3 2007-12-19

English – 19

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Husqvarna 240e, 235e Working Techniques / Maintenance, How to avoid kickback, General, Carburetor adjustment
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240e, 235e specifications

The Husqvarna 235E and 240E are two popular models in the world of lightweight chain saws, designed to deliver excellent performance for both novice and experienced users. Ideal for homeowners and professionals alike, these models are perfect for tasks such as cutting firewood, pruning, and handling small trees.

One of the standout features of the Husqvarna 235E and 240E is their lightweight construction. Weighing in at around 10.3 pounds, these chainsaws are easy to maneuver, reducing fatigue during extended use. The ergonomic design enhances comfort, making it easier for users to maintain a firm grip, especially during challenging cutting tasks.

These models are equipped with the powerful X-Torq engine technology, which provides a significant increase in efficiency. The X-Torq engine reduces fuel consumption by up to 20%, allowing users to work longer without the need for frequent refueling. Additionally, the engine's design minimizes harmful emissions, making the 235E and 240E more environmentally friendly.

Another important characteristic is the chainsaw’s emissions control system. Husqvarna has integrated an efficient air filtration system in both models, ensuring that dirt and debris are kept away from the engine for extended periods. This results in less maintenance and longer operational life.

Ease of starting is also a highlight of these models. The Smart Start technology ensures that the chainsaw can be started with minimal effort, allowing users to get to work quickly. The combined choke and stop control further simplify the starting process, ensuring a smooth operation every time.

Safety features are not overlooked in the Husqvarna 235E and 240E. Each model comes with a chain brake that responds quickly to stop the chain in case of kickback, which is essential for preventing accidents during operation. The low-vibration design reduces strain on the hands and arms, fostering a safer and more comfortable user experience.

Overall, the Husqvarna 235E and 240E offer a combination of power, efficiency, and user-friendly features that set them apart in their category. With a focus on performance and safety, these chainsaws are an excellent choice for anyone looking to tackle cutting, trimming, and pruning tasks with ease and confidence. Whether you are a homeowner looking to manage your yard or a professional seeking reliable equipment, the 235E and 240E are worthy contenders.
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