15
307-889
NO 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. Check paint supply.
1. Refill and reprime pump.
2. Check for clogged intake strainer.
2. Remove and clean, then reinstall.
3. Check for loose suction tube or fittings.
3. Tighten; use thread sealant or sealing tape
on threads if necessary.
4. Check to see if intake valve ball and piston ball
are seating properly. See page 28.
4. Remove intake valve and clean. Check
balls and seats for nicks; replace if neces-
sary. See page 28. Strain paint before us-
ing to remove particles that could clog the
pump.
5. Check for leaking around throat packing nut
which may indicate worn or damaged pack-
ings. See page 28.
5. Replace packings. See pages 28–33. Also
check piston valve seat for hardened paint
or nicks and replace if necessary. Tighten
the packing nut/wet-cup.
Motor runs but pump does not
stroke
1. Check displacement pump connecting rod pin
(20). See page 30.
1. Replace pin if missing. Be sure retainer
spring (42) is fully in groove all around con-
necting rod. See page 30.
2. Check connecting rod assembly (68) for dam-
age. See page 24.
2. Replace connecting rod assembly . 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 24.
3. Check drive housing assembly for damage
and replace if necessary. See page 24.
EXCESSIVE PRESSURE FLUCTUATIONS
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
Spray pattern variations.
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. 33.
1. Reconnect securely. See Fig. 33.
2. Check maximum working pressure.
2. Replace with a new pressure control board
(301). See page 22.
3. Check pressure control board (301) by substi-
tuting with a good pressure control board. See
page 22.
3. Replace with a new pressure control board
(301). See page 22.
4. Check LOW OUTPUT section, page 14.
