Husqvarna 440e, 435e manual Basic cutting technique, Terms

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WORKING TECHNIQUES

7Take great care when you cut with the top edge of the bar, i.e. when cutting from the underside of the object. This is known as cutting with a pushing chain. The chain tries to push the chain saw back towards the user. If the saw chain is jamming, the saw may be pushed back at you.

8Unless the user resists this pushing force there is a risk that the chain saw will move so far backwards that only the kickback zone of the bar is in contact with the tree, which can lead to a kickback.

Cutting with the bottom edge of the bar, i.e. from the top of the object downwards, is known as cutting with a pulling chain. In this case the chain saw pulls itself towards the tree and the front edge of the chain saw body rests naturally on the trunk when cutting. Cutting with a pulling chain gives the operator better control over the chain saw and the position of the kickback zone.

9Follow the instructions on sharpening and maintaining your bar and chain. When you replace the bar and chain use only combinations that are recommended by us. See instructions under the headings Cutting equipment and Technical data.

Basic cutting technique

WARNING! Never use a chain saw by

! holding it with one hand. A chain saw is not safely controlled with one hand. Always have a secure, firm grip around the handles with both hands.

General

•Always use full throttle when cutting!

•Reduce the speed to idle after every cut (running the engine for too long at full throttle without any load, i.e. without any resistance from the chain during cutting, can lead to serious engine damage).

•Cutting from above = Cutting with a pulling chain.

115 10 81-95 Rev.1 2008-01-08

•Cutting from below = Cutting with pushing chain.

Cutting with a pushing chain increases the risk of kickback. See instructions under the heading How to avoid kickback.

Terms

Cutting = General term for cutting through wood. Limbing = Cutting branches off a felled tree.

Splitting = When the object you are cutting breaks off before the cut is complete.

There are five important factors you should consider before making a cut:

1Make sure the cutting equipment will not jam in the cut.

2Make sure the object you are cutting will not split.

3Make sure the chain will not strike the ground or any other object during or after cutting.

4Is there a risk of kickback?

5Do the conditions and surrounding terrain affect how safely you can stand and move about?

Two factors decide whether the chain will jam or the object that you are cutting will split: the first is how the object is supported before and after cutting, and the second is whether it is in tension.

In most cases you can avoid these problems by cutting in two stages; from the top and from the bottom.You need to support the object so that it will not trap the chain or split during cutting.

IMPORTANT! If the chain jams in the cut: stop the engine! Don’t try to pull the chain saw free. If you do you may be injured by the chain when the chain saw suddenly breaks free. Use a lever to open up the cut and free the chain saw.

The following instructions describe how to handle the common situations you are likely to encounter when using a chain saw.

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Contents 445 445e 450e Symbols on the machine KEY to SymbolsSymbols in the operator’s manual You will find the following labels on your chain sawContents Dear customer IntroductionWhat is what on the chain saw? What is WHAT?Before using a new chain saw General Safety PrecautionsAlways use common sense Machine′s safety equipmentPersonal protective equipment Chain brake and front hand guardGeneral Safety Precautions Chain catcher Throttle lockoutRight hand guard Stop switchVibration damping system MufflerGeneral rules Cutting equipmentCutting equipment designed to reduce kickback BarGeneral information on sharpening cutting teeth Sharpening your chain and adjusting depth gauge settingIncreased if the depth gauge setting is General advice on adjusting depth gauge settingAdjustment of depth gauge setting Too largeBar and cause serious or even fatal injury Tensioning the chain445 445e, 450eFilling with chain oil Lubricating cutting equipmentChecking chain lubrication Needle bearing lubrication Chain drive sprocketChecking wear on cutting equipment Fitting the bar and chain Assembly445 445e, 450e115 10 81-95 Rev.1 Fuel Fuel HandlingFueling Fuel safetyTransport and storage Long-term storageStarting and stopping Starting and StoppingStarting Stopping Working Techniques Basic safety rulesBefore use General working instructionsGeneral rules Terms Basic cutting techniqueLimbing Tree felling techniqueLog is supported at one end. There is a high risk Safe distanceClearing the trunk and preparing your retreat Felling directionDirectional cuts Felling cut What is kickback? How to avoid kickbackFreeing a tree that has fallen badly Cutting the trunk into logs Carburetor adjustment MaintenanceGeneral Checking the inertia brake release Muffler Replacing the starter cord StarterTensioning the recoil spring Replacing the return and drive springs Air filterFitting the starter Recoil spring aLubricating the bar tip sprocket Spark plugNeedle bearing lubrication Cooling systemTemperature -5C 23F or colder Air Injection centrifugal cleaningWinter use Daily maintenance Weekly maintenance Monthly maintenance Maintenance scheduleTechnical data Technical DataSaw chain filing and file gauges Bar and chain combinations050/1,3 mm 058/1,5 mmYour Warranty Rights and Obligations Federal Emission Control Warranty StatementSafety precautions for chain saw American Standard Safety PrecautionsOther safety precautions Kickback safety precautionsPage 1151081-95
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