Jonsered CS 2153 manual Felling cut

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WORKING TECHNIQUES

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 1.5-2 inches (3-5 cm) 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.

We recommend that you use a bar that is longer than the diameter of the tree, so that you can make the felling cut and directional cuts with single cutting strokes. See instructions under the heading Technical data section to ﬁnd out which lengths of bar are recommended for your saw.

There are methods for felling trees with a diameter larger than the bar length. However these methods involve a much greater risk that the kickback zone of the bar will come into contact with the tree.

26 – English

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Contents Operator’s manual 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 systemMufﬂer Stop switchCutting equipment General rulesSharpening your chain and adjusting depth gauge setting Cutting equipment designed to reduce kickbackSharpening cutting teeth General advice on adjusting depth gauge settingIf the depth gauge setting is too large Instructions considerably increases the risk of kickbackLubricating cutting equipment Adjustment of depth gauge settingTensioning the chain Chain oilChain drive sprocket Filling with chain oilChecking chain lubrication Needle bearing lubricationBar 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 LimbingSafe distance Tree felling techniqueCutting Log is supported at one end. There is a high risk that itFelling Felling directionClearing the trunk and preparing your retreat Directional cutsFelling cut Freeing 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 Correctly adjusted carburetor High speed jet HThrottle lockout 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 Needle bearing lubricationWinter use Air Injection centrifugal cleaningTemperature 0C 32F or colder Heated handlesMaintenance schedule Daily maintenance Weekly maintenance Monthly maintenanceTechnical Data Technical data050/1,3 mm Bar and chain combinationsSaw chain ﬁling and ﬁle gauges 058/1,5 mmFederal Emission Control Warranty Statement Your Warranty Rights and ObligationsKickback safety precautions American Standard Safety PrecautionsSafety precautions for chain saw users Other safety precautionsPage ´z+RI¶55¨ Page 1150419-95 ´z+RI¶55¨ ´z+RI¶55¨