Troubleshooting Guide - Graco ULTRA 500 Instructions-Parts List Manual

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TROUBLESHOOTING GUIDE
Pressure Relief Procedure
WARNING
jury from moving parts or electric shock, always follow
this
procedure whenever you shut
off
the sprayer, when
To
reduce the risk of serious bodily injury, including fluid injection, splashing fluid in the eyes or on the skin, or
in-
you
stop
spraying.
checking or servicing any part
of
the spray system, when installing, cleaning or changing spray tips, and whenever
2.
Turn the ON/OFF switch
to
OFF.
1.
Engage
the
gun safety latch.
3. Unplug
the power supply cord.
4.
Disengage the gun
safety
latch.
5.
Hold a metal part of the gun firmly to the side of a grounded metal pail, and trigger the gun to relieve pressure.
6.
Engage
the
gun safety latch.
8.
Leave the pressure relief valve open until you are ready
to
spray again.
If you suspect that the spray tip or hose is completely clogged, or that pressure has not been fully relieved after
following the steps above, VERY SLOWLY loosen
the
tip
guard retaining nut or hose end coupling
and
relieve
pressure gradually, then
loosen
completely. Now clear the tip or hose.
'
7 .
Open
the
pressure relief valve, having
a
container ready t o catch
the
drainage.
I .
asic Electrical Problems
WHAT TO CHECK
If check
I8
OK,
go to next check
1. Check the pressure control knob setting. Thl
ting lfully counterclockwise).
motor will not run if
it
is at the minimum sei
2. Check for a clogged spray tip. Refer to your
separate gun or tip instruction manual.
1. Check for frozen or hardened paint in the
tube. Using a screwdriver, carefully
tly
to
pump (39) andlor pressure control bourdon
rotate
fan at
back
of
motor by hand. See
page 19.
2. Check displacement pump connecting rod
pin (20). It must be completely pushed into
connecting rod ( 2 9 1 and spring retainer ( 3 5 1
should be firmly in groove of connecting rod
See page 28.
"
3. Check for motor damage. Remove drive
housing assembly (181. See page
28. Try
to
rotate fan by hand.
"
~~
'Thaw the sprayer if water or water-based paint has frozen in
warm area. Do not try to start the sprayer until
it
has thawed
it,
due to exposure to low temperatures, by placing it in e
completely. If the bourdon tube was not damaged by the
freezing, the pump should operate. If paint hardened (dried) in
the sprayer, the pump packings andlor bare pressure control
must be replaced. See page 26 or manual 307-7(0.
1. Check sprayer circuit breaker (309) button tc
be sure it has not popped up.
2. Check electrical supply with volt meter.
Meter should read 105 to 125 VAC.
3.
Check extension cord for visible damage.
Use
a
volt meter or test lamp at extension
cord outlet to check.
4. Check sprayer power supply cord
(3111
for
vi5ible damage such
as
broken insulation or
wres.
5. Check motor brush leads, terminals and
brush length. Brush length should be 112"
minimum.
See
page 22.
'When re1
remove tb
h e r d and
bare box.
WHAT TO DO
When check Is not
OK refer
to thls
coturn1
1. Slowly increase the pressure setting to see if
the motor starm.
2.
Relieve pressure, refer to your separate gun
or tip instruction manual for tip cleaning.
1.
Thaw'. Plug In sprayer and
turn on. Slowly
increase pressure setting to see if motor
stam.
If it doesn't, replace the displacement
pump packings
(see
manual 307-7531 andlor
replace the bare pressure control box (301)'.
See page
26.
2. Push pin into place and secure with the
spring retainer.
2. Replace motor
(1)
if fan won't turn.
v
1
I
-
-
-
:in9 the bare pressure control box (itern-3011.
circuit breaker, ONIOFF switch, bridge, circuit
sctrical hardware and reinstall these parts in the
1. Depress circuit breaker button to reset. If
trical Short", page 18.
circuit breaker continues to open, see "Elec-
2. Reset building circuit breaker; replace
building fuse. Tly another electrical outlet.
3.
Replace extension cord.
4. Replace power supply cord. See page
23.
5. Tighten terminal screws; replace brushes.
See page
2 2 .
Troubleshooting continuedon nextpege.
3OJ-J50
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