YATO YT-84910 Manual Del Usuario página 21

GB
Turn the pin L clockwise until the motor has reached the maximum idle speed. Then turn the pins L by 1/4 turns counter
clockwise.
Turn the idle run bolt T counter clockwise until the chain stops.
In case the idle speed is too low, turn clockwise.
Carry out a cutting test and set the pin H so as to achieve the optimum cutting force, and not the maximum speed.
6.7. Work with the sawing machine
Having realised all the aforementioned actions, it is allowed to proceed to operate the sawing machine.
Before each start of the sawing machine, make sure the refl ection brake functions correctly. Holding the sawing machine
horizontally, release the front grip and let the guide hit the chopping block or piece of wood. The height from which the sawing
machine should be dropped depends on the length of the chain guide. If the brake does not function, have the sawing machine
repaired and adjusted in an authorised repair shop.
If the brake activates during work, release the throttle lever and let the motor idle. Otherwise a functioning motor will heat the clutch
disk which may damage the sawing machine.
Persons going to work with a chain sawing machine for the fi rst time should consult a qualifi ed operator of the sawing machine
as regards operation and safety. First tasks with the sawing machine should consist in cutting prepared logs placed on a sawing
jack.
During work it is required to observe the basic work safety regulations. Take into account the possibility of rebounding of the sawing
machine towards the operator. The sawing machine may rebound towards the user if the cutting chain encounters resistance.
In order to minimise the risk:
Pay attention to the position of the guide top during cutting. Do not cut with the upper quarter of the guide top. (XIII)
Cut solely with the chain, which moves along the lower side of the guide. While cutting wood, you may use the lower sprocket of
the bumper as a catch of the rotating axis of the sawing machine. (XIV)
Place only a started sawing machine to the piece of wood to be cut. Do not start the sawing machine after it has been placed at
the piece of wood to be processed.
During work it is prohibited to lift the sawing machine to the arm height or higher. (XV)
Do not stand in the cutting plane. This will permit to reduce the risk of injuries in case the sawing machine rebounds. (XVI)
During work keep the sawing machine with both hands at all times.
Make sure the chain is always sharp and properly tensioned.
ADVICE FOR OPERATION OF THE SAWING MACHINE
While cutting adopt a comfortable position and ensure a full freedom of movement.
While cutting branches and boughs, do not cut them at the trunk but approximately 15 centimetres from the trunk. Make two
cuts to the 1/3 of the branch diameter, 8 cm from each other. One cut from the bottom, the other one from the top. Then cut the
branch just at the trunk to the depth amounting to 1/3 of the branch diameter. Finish cutting just at the trunk downwards. Do not
cut branches upwards. (XVII)
While felling trees, it is required to previously prepare the area as described in Point 6.4. Moreover it is required to prepare safe
surfaces in case of tree felling.
While trees are falling, stand at a safe distance to a side to the tree falling plane.
Selecting the route of tree falling you must take into account such factors as the lie of the land, the gravity centre of the trees, the
shape of the crown and the direction of the wind.
In order to correctly prepare trees for felling, make a cut on the trunk to the depth amounting to 1/3 of the trunk diameter at the side
towards which the tree is meant to fall, and then make others at 45° to the fi rst one so as to cut out a wedge out of the trunk. At
the opposite side of the trunk begin cutting perpendicularly to the axis of the trunk, and slightly higher (approximately 4 cm) than
the base of the cut wedge. Do not cut the trunk across. Leave a section whose length amounts to approximately 1/10 of the trunk
diameter. Then insert a tree splitting wedge at the opposite side to the planned tree falling side. (XVIII)
If during cutting the tree falls, remove the saw from the trunk and escape along the previously marked route to a safe distance.
In case the sawing machine wedges during cutting the trunk, do not ever leave it with its motor working in that position. It is
required to turn off the motor of the sawing machine and using a wedge remove the sawing machine from the trunk.
During splitting of felled trees into pieces, observe the following principles.
Place wood on a sawing jack or supports so that the cut piece falls freely to the ground without wedging the sawing machine. If
the sawing machine is wedged, proceed as described above.
The chain and the guide of the sawing machine must not touch the ground or get soiled.
It is prohibited to use the sawing machine to form hedges or cut bushes.
In case of work on a slope during work you must remain above the wood being cut.
While cutting a tensioned tree be particularly careful and if possible have the tree felled by a qualifi ed lumberman.
While cutting wood which is tensioned and supported at both sides, it must be cut downwards to the depth amounting to 1/3
of the diameter, and then fi nish cutting upwards.
If the wood is supported only at one end, cut the wood upwards to the depth amounting to 1/3 of the diameter, and then fi nish
cutting downwards. (XIX)
Thus it is possible to minimise the risk of wedging the sawing machine during cutting.
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