Oscillation return, Limit switches – Grizzly G9983 User Manual
Page 29
G9983 15" Open-End Wide-Belt Sander
-27-
Oscillation Return
Figure 22.
This is the oscillation return valve
and the air eye fork.
The oscillation return keeps the sanding belt in
motion. The valve shown in
Figure 22
controls
the oscillation return.
To adjust the oscillation return:
1.
Turn off all power to the sander, 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 jamnut. DO NOT open the valve
more than needed or there will be excessive
pressure on the air system.
Limit Switches
Figure 23.
Loosen these bolts to adjust
the limit switch position.
The limit switches are mounted on both sides of
the sanding belt. They are designed to stop the
sander if the belt travels too far to one side of the
top roller.
The limit switches are factory set and should
require no adjustments. However, if they stop
working correctly, they move during adjustments,
or they get replaced, proper adjustments will be
required.
To adjust the limit switches:
1.
Center the sanding belt on the top roller.
Measure the distance between the edge of
the sanding belt and the limit switch lever.
This distance should be approximately
1
⁄
2
". If
this measurement is different, then loosen
the adjustment bolts shown in
Figure 23
on
the incorrect side.
2.
Slide the mounting bracket in the necessary
direction until there is a
1
⁄
2
" gap between the
edge of the belt and the limit switch lever.
3.
Tighten the adjustment bolts to secure the
mounting bracket. Test the sander to verify
that operation returns to normal.
Oscillation
Return
Valve
Air Eye
Fork