Troubleshooting; Mechanical/Fluid Flow - Graco ultra max ii Repair Manual

Troubleshooting

Mechanical/Fluid Flow

Relieve pressure; page 9.
TYPE OF PROBLEM
E=XX is displayed
False tripping of WatchDog
system. EMPTY is dis-
played. Pump does not run.
Pump output is low
311365H
WHAT TO CHECK
If check is OK, go to next check
1. Fault condition exists
1. Operating conditions out of
WatchDog parameters. Pump
output is low, see below.
1. Spray tip worn
2. Spray tip clogged
3. Paint supply
4. Intake strainer clogged
5. Intake valve ball and piston ball
are not seating properly
6. Suction hose connections
7. Fluid filter, tip filter, or tip is
clogged or dirty.
8. Prime valve leaking
9. Verify pump does not continue to
stroke when gun trigger is
released. (Prime valve not leak-
ing.)
10. Leaking around throat packing
nut which may indicate worn or
damaged packings.
11. Pump rod damage
12. Low stall pressure
13. Piston packings are worn or
damaged
WHAT TO DO
When check is not OK, refer to this column
1. Determine fault correction from table,
page 13.
1. Turn pressure down. Refer to operation
manual for adjusting. Operate without
WatchDog active; see operation manual.
1. Follow Pressure Relief procedure Warn-
ing, then replace tip. See your separate
gun or tip manual.
2. Relieve pressure. Check and clean spray
tip.
3. Refill and reprime pump.
4. Remove and clean, then reinstall
5. Remove intake valve and clean. Check
balls and seats for nicks; replace if neces-
sary; see pump manual 310643 or
310894. Strain paint before using to
remove particles that could clog pump.
6. Tighten any loose connections. Check for
missing or damaged seals.
7. Clean filter; see operation manual.
8. Relieve pressure. Repair prime valve.
9. Service pump; see pump manual 310643
or 310894.
10. Replace packings; see pump manual. Also
check piston valve seat for hardened paint
or nicks and replace if necessary. Tighten
packing nut/wet-cup.
11. Repair pump. See pump manual 310643
or 310894.
12. Turn pressure knob fully clockwise. Make
sure pressure control knob is properly
installed to allow full clockwise position. If
problem persists, replace pressure trans-
ducer.
13. Replace packings; see pump manual
310643 or 310894.
Troubleshooting
11