Graco 232140 Instructions-Parts List Manual page 14

NO OUTPUT
TYPE OF PROBLEM
Motor runs and pump strokes
Motor runs but pump does not
stroke
EXCESSIVE PRESSURE FLUCTUATIONS
TYPE OF PROBLEM
Spray pattern variations.
14
308800
Troubleshooting
WHAT TO CHECK
If check is OK, go to next check
1. Check paint supply.
2. Check for clogged intake strainer.
3. Check for loose suction tube or fittings.
4. Check to see if intake valve ball and piston ball
are seating properly. See page 29.
5. Check for leaking around throat packing nut
which may indicate worn or damaged pack-
ings. See page 29.
1. Check displacement pump connecting rod pin
(66). See page 30.
2. Check connecting rod assembly (63) for dam-
age. See page 24.
3. Be sure crank in drive housing rotates; plug in
sprayer and turn on briefly to check. Turn off
and unplug sprayer. See page 25.
WHAT TO CHECK
If check is OK, go to next check
1. Be sure leads to motor control board are firmly
connected. Be sure all male terminals blades
are centered and firmly connected to female
terminals. See Fig. 29.
2. Check maximum working pressure.
3. Check motor control board (104) by perform-
ing motor control board diagnostics on page
21. If diagnostics indicate, substitute with a
good board.
CAUTION: Do not perform this check until
motor armature is determined to be good. A
bad motor armature can burn out a good
board.
4. Check LOW OUTPUT section, page 13.
WHAT TO DO
When check is not OK refer to this column
1. Refill and reprime pump.
2. Remove and clean, then reinstall.
3. Tighten; use thread sealant or sealing tape
on threads if necessary.
4. Remove intake valve and clean. Check
balls and seats for nicks; replace if neces-
sary. See page 29. Strain paint before us-
ing to remove particles that could clog
pump.
5. Replace packings. See pages 29–30. Also
check piston valve seat for hardened paint
or nicks and replace if necessary. Tighten
packing nut/wet-cup.
1. Replace pin if missing. Be sure retainer
spring (68) is fully in groove all around con-
necting rod. See page 30.
2. Replace connecting rod assembly. See
page 24.
3. Check drive housing assembly for damage
and replace if necessary. See page 25.
WHAT TO DO
When check is not OK refer to this column
1. Reconnect securely. See Fig. 29.
2. Replace pressure control board (104).
See page 21.
3. Replace with a new pressure control board
(104). See page 21.