Ryobi P542 Manuel d'utilisateur télécharger pdf (Page 17)

17 - English

OPERATION

handles. Do not let the chain contact the ground.

After completing the cut, wait for the saw chain

to stop before you move the chain saw. Always

stop the motor before moving from tree to tree.

 Sometimes it is impossible to avoid pinching

(with just standard cutting techniques) or difficult

to predict which way a log will settle when cut.

To avoid pinching while cutting, rotate or move

the log so that the pinch is eliminated.

BUCKING LOGS UNDER STRESS

See Figures 18 - 19.

When the log is supported along its entire length,

it should be cut from the top or overbucking.

When the log is supported on one end, cut 1/3

the diameter from the underside or underbuck-

ing. Then make the finishing cut by overbucking

to meet the first cut.

As the log is being cut, it will tend to bend. The saw

can become pinched or hung in the log if you make

the first cut deeper than 1/3 of the diameter of the log.

Give special attention to logs under stress to pre-

vent the bar and chain from pinching.

When bucking on a slope, always stand on the uphill

side of the log as shown in figure 18. When “cutting

through,” to maintain complete control of the chain

saw, release the cutting pressure near the end of

the cut without relaxing your grip on the chain saw

handles. Do not let the chain contact the ground.

After completing the cut, wait for the saw chain

to stop before you move the chain saw. Always

stop the motor before moving from tree to tree.

TYPES OF CUTTING USED

See Figure 19.

OVERBUCKING

Begin on the top side of the log with the bottom

of the saw against the log; exert light pressure

downward. Note that the saw will tend to pull

away from you.

UNDERBUCKING

Begin on the under side of the log with the top

of the saw against the log; exert light pressure

upward. During underbucking, the saw will tend

to push back at you. Be prepared for this reaction

and hold the saw firmly to maintain control.

WARNING:

Never climb into a tree to limb or prune. Do not

stand on ladders, platforms, a log, or in any

position which can cause you to lose your bal-

ance or control of the saw.

LOAD

FINISHING CUT

1ST CUT

1/3 DIA

LOG SUPPORTED AT ONE END:

LOG SUPPORTED AT BOTH ENDS:

FINISHING CUT

1ST CUT 1/3 DIA

LOAD

Fig. 18

OvERBUCKING

UNDERBUCKING

Fig. 19

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 75 76

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Ryobi P542 Manuel d'utilisateur Page 17

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