Lower the cutting head slowly (with a low cutting
force of 20 to 40 pounds) and as the head lowers,
pry up the bearing arm as shown in Fig. 8 with a
screw driver or similar tool. Note the clearance
between the bearing arm and guide casting (Fig. 8)
just at the point where the valve has been closed by
lifting up the bearing arm and the cutting head
stops its descent. This clearance should be ,060" to
.090". If it is more than .090", lengthen the linkage
by loosening the locknut (Fig. 9) and turning the
threaded stud counterclockwise. Retighten the
locknut and check the clearance by repeating the
procedure. Repeat if necessary. If the clearance is
less than .060", loosen the locknut (Fig. 9) and turn
the threaded stud clockwise to shorten the linkage.
Retighten the locknut and recheck the clearance.
Repeat if necessary.
After adjustment has been completed, check to be
sure the back edge of the saw blade closes the
metering valve before it contacts the guide casting.
If the upper edge of the blade contacts the guide
body before it closes the metering valve, all cutting
force control is lost and the machine will overfeed,
stripping the teeth from the blade.
The metering valve may require adjustment of the
minimum cutting force. With reference to Fig. 10,
turn the cutting force thimble "D" completely up
into the valve body as shown. Next, adjust the self
locking nut "A" up or down on the threaded stem
"B" until the spring "C" is just touching at each
end. Then turn nut "A" l/2 turn to tighten the
spring. This adjustment establishes the minimum
cutting force. If nut "A" is misadjusted to
overtighten the spring, the minimum cutting force
is increased and can become high enough to strip
teeth from the blade.
C. PREVENTIVE MAINTENANCE
A MONTHLY CHECK should be performed on the
metering valve and guide rollers as follows:
( 1.) Open the cutting head control valve so the head
can descend slowly. Now pry up the blade back-up
roller as illustrated in Fig. 8. The arm should raise
.060" to .090" to close the metering valve and stop
the cutting head descent. If this test stops and
holds the cutting head from descending, the
metering valve is functioning properly.
(2,) A monthly check on the guide rollers can easily
be performed by twisting the blade near the saw
guides. The guide rollers, when adjusted properly,
will not allow any movement of the blade in the
cutting area when twisted, but still must be loose
enough to allow the blade to slide through as
outlined in Section A.
(3.) Check the blade to be sure it is vertical as
shown in Fig. 7.