Model G9983 (Mfg. Since 8/09)
-31-
to
increase the oscillation speed, open the valve
(turn the knob counter-clockwise). For normal
operation, adjust the oscillation speed so each
direction of belt movement takes approximately 2
seconds. When the speed is correct, tighten the
jam nut so the knob will not move.
to
decrease the oscillation speed, close the
valve (turn the knob clockwise). When the speed
is correct, tighten the jam nut.
different speeds may yield different finishing
results. experiment with trial-and-error to deter-
mine the best speed for your particular situation.
the oscillation return keeps the sanding belt in
motion. the valve shown in
figure 28 controls the
oscillation return.
to adjust the oscillation return:
1. disconnect the sander from power, but keep
air pressure going into the machine. lower
the belt and slide it out of the way of the eye
fork.
2. block the airflow between the eye fork until
the top roller rotates to one side and does not
return.
3. With the airflow still blocked, loosen the jam
nut on the valve knob and tighten the knob to
close the valve.
4. now clear the eye fork so the air will flow
between it again. Watch the top roller and
slowly open the valve.
5. When the top roller begins to move, open
the valve another
1
⁄
4
to
1
⁄
2
turn of the knob.
tighten the jam nut. do not open the valve
more than needed or there will be excessive
pressure on the air system.
oscillation return
figure 28. this is the oscillation return valve and
the air eye fork.
oscillation
return
valve
air eye
Fork
Summary of Contents for G9983
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