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20
307–758
NO OUTPUT
TYPE
OF PROBLEM
WHAT
T
O CHECK
If check is OK, go to next check
WHA
T T
O 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 36.
4. Remove intake valve and clean. Check
balls
and seats
for nicks; replace if neces
-
sary.
See page 36. 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 36.
5. Replace packings. See page 36. 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
(43). See page 38.
1.
Replace pin if missing. Be sure retainer
spring
(42) is fully in groove all around con
-
necting
rod. See page 38.
2. Check
connecting rod assembly (70) for dam
-
age.
See page 32.
2.
Replace connecting rod assembly. See
page
32.
3.
Be
sure
crank in drive housing rotates; plug in
sprayer and turn on briefly to check. T
urn of
f
and unplug sprayer
. See page 33.
3.
Check
drive housing assembly for
damage
and replace if necessary
. See page 33.
EXCESSIVE
PRESSURE FLUCTUA
TIONS
TYPE
OF PROBLEM
WHAT
T
O CHECK
If check is OK, go to next check
WHA
T T
O DO
When check is not OK refer to this column
Spray pattern variations.
1.
Be sure both G1 and G2 leads from bridge
(308) to circuit board (72) are firmly con-
nected.
See Fig 27–1.
1.
Reconnect securely
. See page 27.
2.
Check maximum working pressure adjust-
ment. Refer to Pressure Control Adjustment
on
page 30.
2.
Perform
Pressure Control Adjustment. See
page
30.
3.
Check bourdon tube flag and detector posi-
tion. Turn pressure setting to maximum; flag
should
not drag or bind in optical detector slot
of
circuit board.
CIRCUIT BOARD
OPTICAL
DETECTOR
FLAG
3.
Carefully
bend
flag into alignment with de
-
tector
slot to see
if that corrects problem. If
not,
replace bare pressure control assem
-
bly (77). Perform pressure control adjust-
ment
after reassembly
.
4.
Check
circuit board (72) by substituting with
a
good
board. See page 28.
4.
Replace circuit board. See page 28.
5.
Check LOW OUTPUT section, page 19.