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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.
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 manual 307–806.
5. Check for leaking around throat packing nut
which may indicate worn or damaged pack-
ings. See manual 307–806.
1. Check displacement pump connecting rod pin
(43). See manual 307–806.
2. Check connecting rod assembly (68) 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 pressure control circuit board
(B1) are firmly connected. Be sure all male ter-
minals blades are centered and firmly con-
nected to female terminals. See Fig. 26.
2. Check maximum working pressure.
3. Check pressure control board (301) by substi-
tuting with a good pressure control board. See
page 22.
4. Check LOW OUTPUT section, page 14.
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 manual 307–806. Strain paint be-
fore using to remove particles that could
clog the pump.
5. Replace packings. See manual 307–806.
Also check piston valve seat for hardened
paint or nicks and replace if necessary
Tighten the packing nut/wet-cup.
1. Replace pin if missing. Be sure retainer
spring (42) is fully in groove all around con-
necting rod. See manual 307–806.
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. 26.
2. Replace with a new pressure control board
(301). See page 22.
3. Replace with a new pressure control board
(301). See page 22.
.
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