Bedienungsanleitung McCulloch PM33 (Seite 11 von 11) (Deutsch, Englisch, Holländisch, Dänisch, Französisch, Italienisch, Portugiesisch, Spanisch, Schwedisch, Norwegisch, Finnisch)

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Chain saw for tree service

Specialized chain-saw of limited weight designed for use by a trained and competent operator for pruning and dismantling standing tree crowns.

Trained operator person who has competence and knowledge in:

- the use and particular hazards associated with using a chain-saw (for tree service work) manufactured in accordance with the requirements of ISO 11681-

2 and, - the precautions to be taken to limit these hazards including the wearing of the recommended personal protective equipment (PPE).

The specially shaped handgrip on the machine calls for particular care when dealing with kickback. Extreme care should be taken at the end of a cutting oper-

ation in relation to the machine suddenly dropping. This eventuality is difficult to control with this type of handgrip. Attention should be paid to chain sliding.

Instead of penetrating the tree trunk, the chain may slide forward and the operator will not be able to fully control this action. Tree maintenance operators

must be trained in the correct operative techniques concerning safety at work, i.e.: head gear, safety harnesses, cables and spring-clips, as well as all of the

other safety devices that are normally used and must be trained professionally in tree climbing. The ISO 11681-2 regulation permits that, in hands of a trained

operator, it can be used an one hand, carefully using a safe way of work (only for tree surgery). For all other operations it is compulsory to use it with two

hands in the same way as a conventional chain show. WARNING! - WE STRONGLY RECOMMEND NOT TO USE THIS CHAIN SHOW WITH ONE HAND

ONLY. Using the chain saw with only one hand is extremely dangerous, as this will significantly increase the possible occurrence of the dangers listed above.

Pay attention to wires while working; always keep distance from them. Release machine from hook point while refuelling.

General requirements working at height

Operators of tree service chainsaws working at height from a rope and harness should never work alone. A competent ground worker trained in appropriate

emergency procedures should assist them. Operators of tree service chainsaws for this work should be trained in general safe climbing and work position-

ing techniques and shall properly equipped with harnesses, ropes, strops, karabiners and other equipment for maintaining secure and safe working positions

for both themselves and the saw.

Preparing to use the saw in the tree

The chainsaw should checked, fuelled, started and warmed up by the ground worker before it is sent up to the operator in the tree. The chainsaw should be

fitted with a suitable strop for attaching to the operator’s harness (A): a) choke the strop around the attachment point on the rear of the saw; b) provide suit-

able karabiners to allow indirect (i.e. via the strop) and direct attachment (i.e. at the attachment point on the saw) of saw to the operators harness; c) ensure

the saw is securely attached when it is being sent up to the operator; d) ensure the saw it secured to the harness before it is disconnected from the means

of ascent. The possibility to attach the unit on the operators belt greatly reduces the risk of machine damage during aerial work. Stop the machine when it is

attached to the operator. The saw should only be attached to the recommended attachment points on the harness. These may be at mid-point (front or rear)

or at the sides. Where possible attaching the saw to centre rear mid-point will keep it clear of climbing lines and support its weight centrally down the opera-

tor’s spine (B). When moving the saw from any attachment point to another, operators should ensure it is secured in the new position before releasing it from

the previous attachment point.

Using the chainsaw in the tree

An analysis of accidents with these saws during tree service operations shows the primary cause as being inappropriate one-handed use of the saw. In the

vast majority of accidents, operators fail to adopt a secure work position which allows them to hold both handles of the saw. This results in an increased risk

of injury due to: - not having a firm grip on the saw if it kicks back; - a lack of control of the saw such that it is more liable to contact climbing lines and oper-

ators body (particularly the left hand and arm) - losing control from insecure work position resulting in contact with the saw (unexpected movement during

operation of the saw)

Securing the work position for two-handed use

To allow the operator to hold the saw with both hands, they should as general rule, aim for secure work position where they are operating the saw at: - hip

level when cutting horizontal sections; - solar plexus level when cutting vertical sections. Where the operator is working close into vertical stems with a low

lateral forces on their work position, then a good footing may be all that is needed to maintain a secure work position. However as operators move away from

the stem, they will need to take steps to remove or counteract the increasing lateral forces by, for example, a re-direct of the main line via a supplementary

anchor point or using an adjustable strop direct from the harness to a supplementary anchor point (C). Gaining a good footing at the working position can be

assisted by use of a temporary foot stirrup created from an endless sling (D).

Starting the saw in the tree

When starting the saw in the tree, the operator should: a) apply the chain brake before starting; b) hold saw on either the left or right of the body when start-

ing: 1) on the left side hold the saw with either the left hand on the front handle or the right hand on the rear handle and thrust the saw away from the body

while holding the pull starter cord in the other hand; 2) on the right side, hold the saw with the right hand on either handle and thrust the saw away from the

body while holding the pull starter cord in the left hand. The chain brake should always be engaged before lowering a running saw onto its strop. Operators

should always check the saw has sufficient fuel before undertaking critical cuts.

One-hand use of the chainsaw

Operators should not use tree service chainsaws one-handed in place of unstable work positioning or in preference to a handsaw when cutting small diameter

wood at the branch tips. Tree service chainsaws should only be used one-handed where: - the operator cannot gain a work position enabling two-handed use;

and - they need to support their working position with one hand; and - the saw is being used at full stretch, at right angles to and out of line with the operator’s

body (E). Operators should never: - cut with the kickback zone at the tip of the chainsaw guide bar - ‘hold and cut’ sections - attempt to catch falling sections.

Freeing a trapped saw

If the saw should become trapped during cutting, operators should: - switch off the saw and attach it securely to the tree inboard (i.e. towards the trunk side) of

the cut or to a separate tool line; - pull the saw from the kerf whilst lifting the branch as necessary; - if necessary, use a handsaw or second chain saw to release

the trapped saw by cutting a minimum of 30 cm away from the trapped saw. Whether a handsaw or a chainsaw is used to free a stuck saw, the release cuts

should always be outboard (toward the tips of the branch), in order to prevent the saw being taken with the section and further complicating the situation.

McCulloch PM33 Seite 11

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