Husqvarna 966906636, 966906738, 965084001 manual Tree felling technique

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WORKING TECHNIQUES

Turn the log and finish the cut from the opposite side. (70)

The log is supported at one end. There is a high risk that it will split. (71)

Start by cutting from below (about 1/3 of the way through).

Finish by cutting from above so that the two cuts meet.

(72)

The log is supported at both ends. There is a high risk that the chain will jam. (73)

Start by cutting from above (about 1/3 of the way through).

Finish by cutting from below so that the two cuts meet. (74)

Tree felling technique

IMPORTANT! It takes a lot of experience to fell a tree. Inexperienced users of chain saws should not fell trees. Do not attempt any task that you feel unsure of!

Safe distance

The safe distance between a tree that is to be felled and anyone else working nearby is at least 2 1/2 tree lengths. Make sure that no-one else is in this ”risk zone” before or during felling. (75)

Felling direction

The aim is to fell the tree in a position where you can limb and cross-cut the log as easily as possible. You want it to fall in a location where you can stand and move about safely.

Once you have decided which way you want the tree to fall you must judge which way the tree would fall naturally.

Several factors affect this:

Lean of the tree

Bend

Wind direction

Arrangement of branches

Weight of snow

Obstacles within the reach of the tree: for example, other trees, power lines, roads and buildings.

Look for signs of damage and rot in the stem, this makes it more probably that the tree will break and start to fall before you expect it to.

You may find you are forced to let the tree fall in its natural direction because it is impossible or dangerous to try to make it fall in the direction you first intended.

Another very important factor, which does not affect the felling direction but does affect your safety, is to make sure the tree has no damaged or dead branches that might break off and hit you during felling.

The main point to avoid is letting the tree fall onto another tree. It is very dangerous to remove a trapped tree and there is high accident risk. See instructions under the heading Freeing a tree that has fallen badly. (76)

IMPORTANT! During critical felling operations, hearing protectors should be lifted immediately when sawing is completed so that sounds and warning signals can be heard.

Clearing the trunk and preparing your retreat

Delimb the stem up to shoulder height. It is safer to work from the top down and to have the tree between you and the saw. (77)

Remove any undergrowth from the base of the tree and check the area for obstacles (stones, branches, holes, etc.) so that you have a clear path of retreat when the tree starts to fall. Your path of retreat should be roughly 135 degrees away from the intended felling direction. (78)

1Danger zone

2Retreat path

3Felling direction

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 cut you begin with the top cut. Aim using to the saw’s felling direction mark (1) toward a goal further forward in the terrain, where you would like the tree to fall (2). Stand on the right-hand side of the tree, behind the saw, and cut with a pull stroke.

Next make the bottom cut so that it finishes exactly at the end of the top cut. (79)

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. (80)

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. (81)

Set the spike bumper (if one is fitted) just behind the felling hinge. Use full throttle and advance the chain/bar slowly into the tree. Make sure the tree does not start to move in the opposite direction to your intended felling direction. Drive a wedge or breaking bar into the cut as soon as it is deep enough.

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.

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1153136-26 Rev.1 2009-12-29

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Contents 445 445e 450e English 1153136-26 Rev.1 3839 4243 1153136-26 Rev.1 English 102 KEY to Symbols Symbols on the machineSymbols in the operator’s manual Decompression valve The valveContents What is what on the chain saw? IntroductionDear Customer General Safety Precautions Before using a new chain sawMachine′s safety equipment Always use common sensePersonal protective equipment Chain brake and front hand guardStop switch Throttle lockoutChain catcher Vibration damping systemSharpening your chain and adjusting depth gauge setting Cutting equipmentGeneral rules Cutting equipment designed to reduce kickbackTensioning the chain Lubricating cutting equipment Bar Assembly Fitting the bar and chain445 445e, 450eFuel Handling FuelFuel safety FuellingTransport and storage Long-term storageStarting and Stopping Starting and stoppingStarting Cold engineStopping Basic safety rules Working TechniquesBefore use General working instructionsBasic cutting technique TermsLimbing Tree felling technique How to avoid kickback What is kickback?Freeing a tree that has fallen badly Maintenance Carburettor adjustmentGeneral Muffler StarterRight hand guard Replacing the starter cordAir filter Spark plugLubricating the bar tip sprocket Needle bearing lubricationAir Injection centrifugal cleaning Temperature -5C or colderCooling system Winter useMaintenance schedule Daily maintenance Weekly maintenance Monthly maintenanceTechnical Data Technical dataBar and chain combinations Saw chain filing and file gaugesEC-declaration of conformity Applies to Europe only EN ISO 12100-22003, Cispr 122005, EN ISOEnglish 1153136-26 Rev.1 1153136-26 Rev.1 English Original instructions 1153136-26