Graco Mark VII Max Repair Manual page 12

Troubleshooting
TYPE OF PROBLEM
Pump is difficult to prime
No display, sprayer oper-
ates
12
WHAT TO CHECK
If check is OK, go to next check
1. Air in pump or hose
2. Intake valve is leaking
3. Pump packings are worn
4. Paint is too thick
1. Display is damaged or has bad
connection
WHAT TO DO
When check is not OK, refer to this column
1. Check and tighten all fluid connections.
Cycle pump as slowly as possible during
priming.
2. Clean intake valve. Be sure ball seat is not
nicked or worn and that ball seats well.
Reassemble valve.
3. Replace pump packings; see pump man-
ual.
4. Thin the paint according to supplier recom-
mendations.
1. Check connections. Replace display.
3A2244A