Troubleshooting
3Z9478A
37
Problem
Cause
Solution
Paint leaks down outside of pump. Worn pump packings.
Replace pump packings, page 51.
Paint comes out of pressure
control knob.
Worn pressure control knob.
Return sprayer to Graco/M
AGNUM
authorized service
center.
Pressure drain actuates
automatically, relieving pressure
through prime tube.
System is overpressuring.