Ryobi P545, Operator'S Manual

Page: 17 / 76

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