Graco ULTRA 1000 Instructions-Parts List Manual page 17

0 OUTPUT
Zontinuedl
. .
WHAT TO CHECK
If
check is
OK. ao to
next check
-
4. Check to see if intake valve ball and piston
ball are seating properly. See manual
307-793.
lotor runs but pump does
)t
stroke
KCESSIVE PRESSURE
.UCTUATIONS
pray pattern variations.
1
-
!
IOTOR IS HOT
8
UNS INTERMllTENTLY
5. Check for leaking around throat packing nut
which may indicate worn or 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 spreyerand turn on momentarily to check
Turn off and unplug sprayer. See page
2 9 .
1. Be sure both G l and G2 leads from bridge
connected. See page
2 5 .
( 3 0 8 )
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.
rClRCUlTBOARD
OPTICAL
DETECTOR
VIEWOFOPTICAL DETECTOR AND FLAG
1. Check circuit board 1 2 3 ) by substituting.with
5.
Check LOW OUTPUT section on Daae 16.
a good board. See page 25.
I.
Check to see if sprayer has been operating ai
low motor RPM and results in excessive heal
high pressure with small tips, which causes
build up.
L
Check to see if ambient temperature where
sprayer is located is more than
90°F
(32oC)
o r
if sprayer is located in direct sun.
I.
Check to see if sprayer has been l e f t in a
stalled condition lsoraver turned on.
pressurized, but not operating) for lbng
periods of time.
L
When replacing the bare
pressure
control
box
1301l. remove the circuit board, bridge,
circuit
board,
and
electrical
hardware and reinstall in the new bars
box.
4. Remove intake valve and clean. Check bells
and seats for nicks; replace if necessaty:Set
manual 307-793.
5. Replace packings. See manual
3 0 7 . 7 9 3 .
Also
nicks and rmlace if necessarv,
check piston valve seat for hardened paint
01
1. Replace pin if missing. Be sure retainer
spring is fully in groove all around connect-
ing rod. See 28.
2. Replace connecting rod assembly. See page
28.
3. Check drive housing assembly for damage
and replace if necBssBTy. See page 29.
1. Reconnect securely. See page 24 and
25.
2. Calibrate pressure control. See page 27.
3. Carefully bend flag into alignment with
detector slot to see if that corrects problem.
If not, replace bare pressure control
assembly. (301)'. Calibrate pressure control
after reassembly.
4. Replace circuit board. See page
2 5 ,
WHAT TO DO
When check is
not OK
refer to thla column
3
I
-
-
-
-
1. Decrease pressure setting or increase tip
51ze.
2. Move sprayer to shaded, cooler area if
possible.
3.
Turn off sprayer whenever you stop spraying
for a while and relieve fluid pressure.
Troubleshooting continued on next page.