Graco ProX7 & ProX9 Manual Do Utilizador

If pressure control switch diagnostics reveal a damaged pressure control, replace it with the correct 

Pressure Con-

trol Switch Kit, see page 28. X5 and X7 sprayers have different pressure control kits because stall pressure is pre-
set at the factory.

1. Unplug power cord and 

Relieve Pressure, page 11.

2. If paint is leaking from pressure control switch 

between pressure control knob and base, replace 
pressure control switch.

3.

ProX7 and ProX9: Remove front cover, yoke, and 
pins. Disconnect pressure control switch connector 
from control board.

X5 and X7: Remove enclosure and disconnect 
pressure control switch connector from control 
board. Use finger to support control board when 
removing pressure control switch connector.

4. Use ohmmeter to check for no continuity between 

sprayer ground and both pressure control terminals 

in connector. If either pressure control switch lead is 
shorted to ground, pressure control switch wires 
have been pinched to ground during assembly and 
pressure control switch needs to be replaced. 

5. Use Ohmmeter to measure across two terminals in 

pressure control connector. No continuity or open 
circuit should exist when pressure control knob is at 
lowest pressure setting (full counter-clockwise). 
Replace pressure control switch if continuity exists. 

6. Using ohmmeter to measure across two terminals in 

pressure control connector. Continuity or closed 
circuit should exist when pressure control knob is 
set at maximum pressure (full clockwise). Replace 
pressure control switch if no continuity exists.