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Troubleshooting
3A0157B 11
Pump output is low
1. Spray tip worn 1. Follow Pressure Relief Procedure on
page 8, then replace tip. See your sepa-
rate gun or tip manual.
2. Spray tip clogged 2. Relieve pressure. Check and clean spray
tip.
3. Paint supply 3. Refill and reprime pump.
4. Intake strainer clogged 4. Remove and clean, then reinstall
5. Intake valve ball and piston ball
are not seating properly
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. Suction hose connections 6. Tighten any loose connections. Check for
missing or damaged seals.
7. Fluid filter, tip filter, or tip is
clogged or dirty.
7. Clean filter; see operation manual.
8. Prime valve leaking 8. Relieve pressure. Repair prime valve.
9. Verify pump does not continue to
stroke when gun trigger is
released. (Prime valve not leak-
ing.)
9. Service pump; see pump manual 310643
or 310894.
10. Leaking around throat packing
nut which may indicate worn or
damaged packings.
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. Pump rod damage 11. Repair pump. See pump manual 310643
or 310894.
12. Low stall pressure 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. Piston packings are worn or
damaged
13. Replace packings; see pump manual
310643 or 310894.
14. O-ring in pump is worn or dam-
aged
14. Replace o-ring; see pump manual 310643
or 310894.
15. Intake valve ball is packed with
material
15. Clean intake valve; see pump manual
310643 or 310894.
16. Pressure setting is too low 16. Increase pressure; see pump manual
310643 or 310894.
17. Large pressure drop in hose with
heavy materials
17. Use larger diameter hose and/or reduce
overall length of hose. Use of more than
100 ft of 1/4 in. hose significantly reduces
performance of sprayer. Use 3/8 in. hose
for optimum performance (50 ft minimum).
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column