Ryobi P540 - Manual (Page 18)

18
BUCKING LOGS UNDER STRESS
See Figures 20 - 21.
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 underbucking. 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 prevent the
bar and chain from pinching.
When bucking on a slope, always stand on the uphill side
of the log as shown in Figure 19. 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. See Figure 19.
TYPES OF CUTTING USED
See Figure 21.
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 under-
bucking, the saw will tend to push back at you. Be pre-
pared for this reaction and hold the saw firmly to maintain
control.
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. 20
OPERATION
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 balance or control of the saw.
OVERBUCKING
UNDERBUCKING
Fig. 21