Graco G-Max 7900 - Pressure Control System

Pressure Control
18 308870G
Pressure Control
Control Board
NOTE: All Steps refer to FIG. 20.
Removal
1. Relieve pressure, page 6.
2. Remove five screws (307) and cover (322).
3. Disconnect at control board (302):
• Four clutch leads: two violet and two black.
• Lead (D) from potentiometer.
• Lead (E) from transducer.
• Two red leads (A) to ON/OFF switch (309).
4. Remove five screws (303), green ground wire and
control board (302).
Installation
When installing replacement control board, follow
instructions with control board to set model type.
1. Install green ground wire and control board (302)
with five screws (303).
2. Connect to control board (302):
• Two red leads (A) to ON/OFF switch (309).
• Lead (E) to transducer.
• Lead (D) to potentiometer.
• Four clutch leads: two violet and two black.
3. Fig. 16. Install cover (322) with five screws (307).
FIG. 20
Green
Violet
Pressure
transducer
Potentiometer
Red (+)
Black
Red
309
(Ref)
304
(Ref)
318z
(Ref)
310
(Ref)
302
(Ref)
D
E
A
318aa
(Ref)