Grizzly G9983 - Manual (Page 40)

-38- G9983 15" Open-End Wide-Belt Sander
Air System
Various functions on the Model G9983 are con-
trolled through the air system. Since this is a com-
plex network of hoses and valves, please take
some time to familiarize yourself with each item
so you can better understand your machine dur-
ing adjustments.
The illustration below follows the air travel
through the machine to familiarize you with how it
works. Match the letters in the text with those in
the illustration to learn more about each function.
1. The air flows into the machine at the pres-
sure regulator (A). This should be adjusted to
75 PSI.
2. The solenoid valve (C) controls the brake
caliper (B) when signaled by the emergency
stop switch or the limit switches.
3. The switching valve (E) controls the vertical
cylinder (D) which raises/lowers the top roller
(M) to tighten/loosen the sanding belt.
E
M
I
H
P
A
Air Inlet
C B
G
N
F
D
J
K
O
F
L
4. The valve (G) controls the air flow volume
that goes to the air eye fork (F), which con-
trols the belt oscillation return.
5. The diaphragm (H) actuates the switching
valve (I) depending on whether air is coming
from the eye fork (F) or the pressure regula-
tor (A).
6. Switching valve (I) actuates the diaphragm
(J), which controls oscillation arm (K), which
in turn, moves eccentric shaft (L), which
makes top roller (M) shift back and forth to
control belt movement during operation.
7. Valve (O) controls the speed at which the
belt moves back and forth.
8. Knob (N) allows you to rotate the eccentric
shaft (L) to balance the oscillation timing so it
takes the belt the same amount of time to
move in one direction as it moves in the other
direction.
This is an illustration of the air control system.