Graco ULTRA 1000 Instructions-Parts List Manual page 17

TYPE OF PROBLEM
NO OUTPUT
(Continued)
-
Motor runs but pump does
not
stroke
EXCESSIVE PRESSURE
FLUCTUATIONS
Spray pattern variations.
OTOR
IS
HOT
b
INTERMITTENTLY
WHAT TO CHECK
If check Is OK,
go to next check
4. Check to see if intake valve ball and piston
ball are seating properly. See manual
307-793.
5. Check for leaking around throat packing nut
which may indicate worn o r damaged pack-
ings.See manual 307-793.
1. Check.displacement pump connecting rod
pin. See page
28.
2. Check connecting rod assembly for damage.
see
page 28.
3. Be sure crank in drive housing rotates; plug
in sprayer and turn on momentarily to check
Turn off and unplug sprayer. See page
29.
"
1. Be sure both G1 and 6 2 leads from bridge
connected. See page
2 5 .
(308) to circuit board
123)
are firmly
2. Check stall pressure. Refer to Calibration
procedure on page
27.
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
I b-
FLAG
VIEW OF OPTICAL DETECTOR AND FLAG
4. Check circuit board (23) by substituting with
a good board. See page 25.
5. Check LOW OUTPUT section on Dam 16.
1. Check to see if sprayer has been operating a
high pressure with small tips, which causes
low motor RPM and results in excessive hea
build up.
2. Check to
SB%
if ambient temperature where
sprayer is located is more than W0F
( 3 2 O C I
or
if
sprayer is located in direct sun.
3. Check to
see if sprayer has been
left
in a
stalled condition (sprayer turned on,
pressurized,
but
not Operating) for long
periods of time.
WHAT TO
DO
When check Is not OK refer t o this column
4. Remove intake valve and clean. Check balls
and
seats
for nicks; replace
if
necessary. See
manual 307-793.
5.
Replace packings.
See manual 307-793. Also
check piston valve seat for hardened paint or
nicks and replace if necessary.
.
Replace pin if missing. Be sure retainer
spring is fully in groove all around connect-
ing
r o d .
See
28.
I. Replace connecting rod assembly. See page
:.
Check
drive housing assembb for damage
and replace if necessary. See page
29.
28.
.
Reconnect securely. See page 24 and 25,
!. Calibrate pressure control. See page 27.
I.
Carefully bend flag into alignment with
detector slot to see if that corrects problem.
If not, replace bare pressure control
assembly (3011'. Calibrate pressure control
after reassembly.
1. Replace circuit board. See page 25.
.
Decrease pressure setting or increase tip
s1ze.
I . Move sprayer to shaded, cooler area'if
possible.
1 .
Turn off sprayer whenever you stop spraying
for a while and relieve fluid pressure.
When replacing the bare pr(glure wntml
box
I 3 0 1 I, remove the circun board, bridge,
drcub b o a r d ,
and
ebnrical hardwam
and reinnall In
the
new bare
box.
Troubleshooting continued on next page.
307-785
17
. ..
. .
..
.:
, .
. ...
,
. .
. .
. .
. .