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PROBLEM
Low or fluctuating output
Motor runs but pump does not
stroke
Troubleshooting
WHAT TO CHECK
If check is OK, go to next check
1. For worn spray tip.
2. Verify pump does not continue to stroke when
gun trigger is released.
3. Filter clogged.
4. Prime valve leaking.
5. Suction hose connections.
6. Electrical supply with volt meter.
Meter must read:
210–255 Vac for 220–240 Vac models.
85–130 Vac for 100–120 Vac models. Low volt-
ages reduce sprayer performance.
7. Extension cord size and length; must be at least
12 gauge wire and no longer than 300 ft. Longer
cord lengths reduce sprayer performance.
8. Low stall pressure.
9. Motor armature for shorts by using an armature
tester (growler) or perform spin test. See page
9.
10.
Paint supply.
11.
Intake strainer clogged.
12.
Suction tube or fittings loose.
13.
To see if intake valve ball and piston ball are
seating properly. See page 21.
14. Leaking around throat packing nut which may
indicate worn or damaged packings. See page
21.
15. Pump rod damage
1. Displacement pump pin (114) (damaged or
missing), page 21.
2. Connecting rod assembly (9) for damage, page
19.
3. Gears or drive housing, page 19.
WHAT TO DO
When check is not OK refer to this column
1. Follow Pressure Relief Procedure Warn-
ing, then replace tip. See your separate
gun or tip manual.
2. Service pump. See page 21.
3. Relieve pressure. Check and clean filter.
4. Relieve pressure. Repair prime valve.
5. Tighten any loose connections.
6. Reset building circuit breaker; replace
building fuse. Repair electrical outlet or try
another outlet.
7. Replace with a correct, grounded exten-
sion cord.
8. Do either or both:
c. Turn pressure control knob fully
clockwise. Make sure pressure
control knob is properly installed
to allow full clockwise position.
d. Try a new transducer.
9. Replace motor. See page 20.
10.Refill and reprime pump.
11. Remove and clean, then reinstall.
12.Tighten; use thread sealant or sealing tape
on threads if necessary.
13.Remove intake valve and clean. Check
balls and seats for nicks; replace if neces-
sary, page 21. Strain paint before using to
remove particles that could clog pump.
14.Replace packings, page 21. Also check
piston valve seat for hardened paint or
nicks and replace if necessary. Tighten
packing nut/wet-cup.
15.Repair pump, page 21.
1. Replace pump pin if missing. Be sure re-
tainer spring (27) is fully in groove all
around connecting rod, page 21.
2. Replace connecting rod assembly,
page 19.
3. Inspect drive housing assembly and gears
for damage and replace if necessary,
page 19.
309255
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