General Problem: No Output; General Problem: Excessive Pressure Build Up - Graco MAGNUM 232738 Repair Manual

Specific Problem
Power switch is on and sprayer
is plugged in but pump does
not cycle
Motor runs but pump does not
cycle
Motor does not run

General Problem: Excessive Pressure Build Up

Specific Problem
Prime/Spray Valve actuates
automatically, relieving
pressure through drain tube.
309477F

General Problem: No Output

Cause
See Basic Troubleshooting,
page 9.
Gear and/or yoke are damaged
(XR9 only)
Water or paint entered
pressure control switch or
shorted control board
Cause
Pressure control switch is worn Replace pressure control switch using Pressure
Water or paint entered
pressure control switch or
shorted control board
Control board failed
Solution
Replace gear and yoke using Gear/Yoke Repair
Kit, page 18.
Clean out and/or dry out and retry. Replace if
necessary using Pressure Control Switch Kit,
page 18.
Solution
Control Switch Kit, page 18.
Clean out and/or dry out and retry. Replace if
necessary using Pressure Control Switch Kit,
page 18.
See Control Board Diagnostics, page 19.
Replace damaged control board using Control
Board Kit, page 18.
Advanced Troubleshooting
17