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GZ3500T

GB-6

WORKING WITH TREE SERVICE CHAIN-SAWS
FROM A ROPE AND HARNESS

This chapter sets out working practices to reduce the
risk of injury from tree service chainsaws when working
at height from a rope and harness.  While it may form
the basis of guidance and training literature, it should
not be regarded as a substitute for formal training.

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 emer-
gency 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 har-
nesses, 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 har-
ness:

a) choke the strop around the attachment point on the

rear of the saw (A);

b) provide suitable karabiners to allow indirect (i.e. via

the strop) and direct attachment (i.e. at the attach-
ment point on the saw) of saw to the operators har-
ness;

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 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 operator’s spine.

When moving the saw from any attachment point to an-
other, 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 witch 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 operators body (par-
ticularly the left hand and arm)

• losing control from insecure work position resulting

in contact with the saw (unexpected movement dur-
ing 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 posi-
tion 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 har-
ness to a supplementary anchor point.

(A)

Содержание GZ3500T

Страница 1: ...GZ3500T GB 1 G B GZ3500T CHAIN SAW OWNER S MANUAL G B 848CE093A0 807...

Страница 2: ...accidents which could lead to serious bodily injury or death IMPORTANT This mark indicates instructions which must be followed or it leads to mechanical failure breakdown or damage NOTE This mark indi...

Страница 3: ...E Directive 98 37 EC 89 336 EEC and to the regulations governing transposition Internal control production MANUFACTURER Husqvarna Zenoah Co Ltd No 9 1 Chome MINAMIDAI KAWAGOE City SAITAMA JAPAN DECLAR...

Страница 4: ...ee 9 Always hold the chain saw firmly with both hands when the engine is run ning Use a firm grip with thumb and fingers encircling the chain saw handles 10 Keep all parts of your body away from the s...

Страница 5: ...ine is running Use a firm grip with thumbs and fin gers encircling the chain saw handles A firm grip will help you re duce kickback and maintain control of the saw 3 Make certain that the area in whic...

Страница 6: ...hese 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 operator...

Страница 7: ...nstable work positioning or in pref erence 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...

Страница 8: ...mp is The High speed adjustment screw The screw under the L stamp is The Slow speed adjustment screw The screw at the left of the T stamp is the Idle adjustment screw Position Left side of the rear ha...

Страница 9: ...the tip of the bar adjust the chain tension by turning the tensioner screw until the tie straps just touch the bottom side of the bar rail 6 Tighten the nuts securely with the bar tip held up 11 8 14...

Страница 10: ...change in product with no functional influence are not cov ered by the warranty Also be careful that if the usage in the instruction manual is not observed as to the mixed gasoline etc described there...

Страница 11: ...e on bottom of the clutch side Adjust according to your work conditions The oil tank should become nearly empty by the time fuel is used up Be sure to refill the oil tank every time when refueling the...

Страница 12: ...st the H needle for best cutting power not for maximum speed CHAIN BRAKE The chain brake is a device which stops the chain in stantaneously if the chain saw recoils due to kickback Normally the brake...

Страница 13: ...nt that the chain brake be checked for proper operation before each use and that the chain be sharp in order to main tain the kickback safety level of this saw Removal of the safety devices inadequate...

Страница 14: ...engine Periodically check and clean the cylinder fins after re moving the air cleaner and the cylinder cover When installing the cylinder cover make sure that switch wires and grommets are positioned...

Страница 15: ...he engine is stopped Use a round file of proper size for the chain Chain type 91VG File size 5 32 in 4 0 mm Place the file on the cutter and push straight forward Keep the file position as illustrated...

Страница 16: ...shooting Guide Case 1 Starting failure WARNING Make sure the icing prevention system is not work ing Case 2 Lack of power Poor acceleration Rough idling Case 3 Oil does not come out If the unit seems...

Страница 17: ...o change wihout notice Power unit Displacement cm3 35 2 Fuel Mixture Gasoline 50 Two cycle oil 1 when using ZENOAH genuine oil Fuel tank capacity cm3 245 Chain oil Motor oil SAE 10W 30 Oil tank capaci...

Страница 18: ...D FOR THE PERIOD OF TIME UP TO THE FIRST SCHEDULED RE PLACEMENT POINT FOR THE PART ANY REPLACEMENT PART THAT IS EQUIVALENT IN PERFORMANCE AND DULABILITY MAY BE USED IN NON WARRANTY MAINTENANCE OR REPA...

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