Graco ULTRA AIRLESS 230-963 User Manual
Page 14
TYPE OF PROBLEM
NO OUTPUT
(Continued)
Motor runs but pump does
not stroke
EXCESSIVE PRESSURE
FLUCTUATIONS
Spray
variations.
MOTOR IS HOT
RUNS
WHAT TO CHECK
If
check is
OK,
go
t o next check
,
Check to see
if
intake valve ball and
piston ball are seating properly.
See
manual
.
Check for leaking around throat packing
nut which may indicate worn or damag-
ed
manual
.
Check displacement pump connecting
rod
pin.
,
Check connecting rod assembly for
damage. See page 25.
.
Be sure crank
in
drive housing rotates;
plug
in
sprayer and turn on momentarily
to check. Turn
off and unplug sprayer.
See page 25.
.
Be sure both
and
leads from
firmly connected. See page
22.
bridge
to circuit board
are
'.
Check stall
Refer to Calibration
procedure on page 24.
Check bourdon tube flag and detector
position. Turn pressure sening to max-
imum; flag should not drag or bind
in
optical detector slot of circuit board.
OPTICAL
DETECTOR
"
OPTICAL
DETECTOR
FLAG
OF OPTICAL DETECTOR AND FLAG
I.
Check circuit board
by substituting
with a good board. See page
22.
Check
LOW OUTPUT section on page
12.
.
Check to
see
if sprayer has been
operating at high pressure with small
tips, which causes low motor RPM and
results
in
excessive heat build up.
Check to
see
if ambient temperature
where sprayer is located is more than
or
if
sprayer
is
located
in
direct sun.
Check to
see if sprayer has been left in a
stalled condition [sprayer turned on,
pressurized, but not operating) for long
periods of
WHAT TO DO
If
check
is
NOT
OK refer to this column
Remove intake valve and clean. Check
balls and seats for nicks; replace if
necessary. See manual
Replace packings. See manual
Also check piston valve seat for harden-
ed
paint or nicks and replace
if
.
Replace pin if missing. Be sure retainer
spring is fully in groove around
connecting rod. See page 26.
Replace connecting rod assembly. See
page 25.
Check drive housino assemblv for
damage and
if necessary.
See
page
25.
.
Reconnect securely. See page
22.
Calibrate pressure control. See page 24.
I.
Carefully bend flag into alignment with
detector slot to see if that corrects pro-
blem.
assembly
Calibrate pressure
If not, replace bare pressure control
trol after reassembly.
I.
Replace circuit board. See page
22.
Decrease pressure sening or increase
tip
size.
!.
Move sprayer
possible.
to shaded,
area if
Turn
off
sprayer whenever you stop
spraying for
and relieve fluid
pressure.
307-671
13