Husqvarna 336 EPA I manual Felling, Directional cuts

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WORKING TECHNIQUES

Felling

WARNING! Unless you have special training

!we advise you not to fell trees with a diameter larger than the bar length of your saw!

Felling is done using three cuts. First you make the directional cuts, which consist of the top cut and the bottom cut, then you ﬁnish with the felling cut. By placing these cuts correctly you can control the felling direction very accurately.

Directional cuts

To make the directional cuts you begin with the top cut. Stand to the right of the tree and cut on the pull stroke.

Next make the bottom cut so that it ﬁnishes exactly at the end of the top cut.

The directional cuts should run 1/4 of the diameter through the trunk and the angle between the top cut and bottom cut should be 45°.

The line where the two cuts meet is called the directional cut line. This line should be perfectly horizontal and at right angles (90°) to the chosen felling direction.

Felling cut

The felling cut is made from the opposite side of the tree and it must be perfectly horizontal. Stand on the left side of the tree and cut on the pull stroke.

Make the felling cut about 3-5 cm (1.5-2 inches) above the bottom directional cut.

Finish the felling cut parallel with the directional cut line so that the distance between them is at least 1/10 of the trunk diameter. The uncut section of the trunk is called the felling hinge.

The felling hinge controls the direction that the tree falls in.

All control over the felling direction is lost if the felling hinge is too narrow or non-existent, or if the directional cuts and felling cut are badly placed.

When the felling cut and directional cut are complete the tree should start to fall by itself or with the aid of a felling wedge or breaking bar.

26 – English

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Contents Operator’s manual 336 EPA Symbols in the operator’s manual KEY to SymbolsSymbols on the machine Contents Introduction Dear customerWhat is WHAT? What is what on the chain saw?Always use common sense General Safety PrecautionsBefore using a new chain saw Chain brake and front hand guard Machine′s safety equipmentPersonal protective equipment General Safety Precautions Right hand guard Throttle lockoutChain catcher Vibration damping system Stop switchCutting equipment MufﬂerBar General rulesCutting equipment designed to minimise kickback ChainSharpening cutting teeth Sharpening your chain and adjusting depth gauge settingGeneral information on sharpening cutting teeth Tensioning the chain General advice on adjusting depth gauge settingAdjustment of depth gauge setting 336Chain oil Lubricating cutting equipment339XP Filling with chain oilChecking wear on cutting equipment Chain drive sprocketNeedle bearing lubrication Assembly Fitting the bar and chainFuel Handling FuelTransport and storage Fuel safetyFueling Long-term storageCold engine Starting and StoppingStarting and stopping Warm engineStopping Before use Basic safety rulesWorking Techniques General working instructionsGeneral rules Terms Basic cutting techniqueGeneral Limbing CuttingFelling direction Tree felling techniqueSafe distance Clearing the trunk and preparing your retreatFelling Directional cutsFreeing a trapped tree General adviceFreeing a tree that has fallen badly Cutting trees and branches that are in tensionCutting the trunk into logs How to avoid kickbackWhat is kickback? General MaintenanceCarburetor adjustment Checking brake band wear Correctly adjusted carburetorHigh speed jet H Checking the front hand guardChecking the brake trigger Changing a broken or worn starter cord MufﬂerStarter Changing a broken recoil spring Air ﬁlterTensioning the recoil spring Fitting the starterLubricating the bar tip sprocket Adjustment of the oil pumpSpark plug Cooling systemMaintenance schedule Daily maintenance Weekly maintenance Monthly maintenanceTechnical Data Technical dataBar and chain combinations, model Saw chain ﬁling and ﬁle gaugesFederal Emission Control Warranty Statement Your Warranty Rights and ObligationsKickback safety precautions American Standard Safety PrecautionsSafety precautions for chain saw users Other safety precautions1150239-95 ´z+R7¶5B¨ ´z+R7¶5B¨