Graco 190ES 309063F - Manual (Page 11)

11 309063
Troubleshooting
LOW OR FLUCTUATING OUTPUT
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
Motor runs and pump strokes 1. Paint supply. 1. Refill and reprime pump.
2. Intake strainer clogged. 2. Remove and clean, then reinstall.
3. Suction tube or fittings loose. 3. Tighten; use thread sealant or sealing tape
on threads if necessary.
4. To see if intake valve ball and piston ball are
seating properly. See page 26.
4. Remove intake valve and clean. Check
balls and seats for nicks; replace if neces-
sary, page 26. Strain paint before using to
remove particles that could clog pump.
5. Leaking around throat packing nut which may
indicate worn or damaged packings. See
page 26.
5. Replace packings, page 26. Also check
piston valve seat for hardened paint or
nicks and replace if necessary. Tighten
packing nut/wet-cup.
6. Pump rod damage. 6. Repair pump, page 26.
7. Capacitor failure. Visually inspect capacitor
near terminals. Ensure that orange safety re-
lief plug is intact.
7. Replace capacitor.
Motor runs but pump does not
stroke 1. Displacement pump pin (9a) (damaged or
missing), page 26.
1. Replace pump pin if missing. Be sure re-
tainer spring (9b) is fully in groove all
around connecting rod, page 26.
2. Connecting rod assembly (9) for damage,
page 24.
2. Replace connecting rod assembly,
page 24.
3. Gears or drive housing, page 24. 3. Inspect drive housing assembly and gears
for damage and replace if necessary,
page 24.
Motor is hot and runs intermit-
tently 1. Be sure ambient temperature where sprayer
is located is not more than 115 _F (46 _C) and
sprayer is not located in direct sun.
1. Move sprayer to shaded, cooler area if pos-
sible.
2. Motor has burned windings indicated by re-
moving positive (red) brush and seeing
burned adjacent commutator bars.
2. Replace motor. See page 25, Motor Re-
placement.
3. Tightness of pump packing nut. Overtighten-
ing tightens packings on rod, restricts pump
action and damages packings.
3. Loosen packing nut. Check for leaking
around throat. Replace pump packings if
necessary. See pump manual 309060.