Troubleshooting Guide - Graco ULTRA 1000 Instructions-Parts List Manual

TROUBLESHOOTING GUIDE
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Pressure Relief Procedure
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
1.
Engage the
gun
safety
latch.
2.
Turn the
ON/OFF
switch
to OFF.
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
metal
pail, and
trigger the gun
to
relieve pressure.
6.
Engage
the
gun
safety latch.
7.
Open the pressure relief valve.
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
staps above,
VERY SLOWLY
loosen the tip guard retaining nut or hose end coupling and relieve
pressura gradually, then loosen completely.
Now
clear the tip
or
hose.
TYPE
OF
PROBLEM WHAT TO CHECK
If check is OK, go to next check
MOTOR WON'T OPERATE
Basic Fluid Pressure Problems 1. Check the pressure control knob setting. Tht
ting (fully counterclockwise).
motor will not run if it
is
at the minimum set
12. Check for a clogged spray tip. Refer to your
saparate gun or
tip
instruction manual.
Basic Mechanical Problems 11. Check for frozen or hardened mint in the
pump
( 3 9 1
andlor pressure control bourdon
tube. Using a screwdriver. carefully try to
rotate fan
at
back of motor by hand. See
page 19
2. Check displacement pump connecting rod
connecting rod
( 2 9 1
and spring retainer
13.5)
pin
(20).
It must be completely pushed into
should be firmly in groove of connecting rod
See page
28.
I
3 . Check for motor damage. Remove drive
housing assembly (18). See page 29. Try
to
rotate fan by hand.
lasic Electrical Problems 1. Check sprayer circuit breaker (309) button to
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 card 1311) for
visible damage such as broken insulation or
wires.
5. Check motor brush
leads.
terminals and
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brush length. Brush length shouid be 1 1 2
minimum. See page
2 2 .
WHAT TO DO
When check is not OK refer to this column
1. Slowly increase the pressure setting to see if
the motor starts.
2. Relieve pressure, refer to your separate gun
or
tip
instruction manual for
tip
cleanina.
I .
Thaw'. Plug in sprayer and turn on. Slowly
incraase pressure setting to sae if motor
starts.
If it doesn't. replace the displacement
pump packings
I s m
manual 307-7931 andlor
replace the bare pressure control box (3011'.
See page 26.
2. Push pin into place end secure with the
spring retainer.
2. Replace motor (1) if fan won't turn.
I .
Depress circuit breaker button to reset. If cir-
trial
Shod', page 18.
cuit breaker continues to open, see "Elec-
2. Reset building circuit breaker; replace
building fuse. Try another. electrical outlet.
3. Replace extension cord.
1. Replace power supply cord.
See
page
23.
i. Tighten terminal screws; replace brushes.
See page
22.
'Thaw the sprayer if water or water-based paint has frozen in 2When replacing the bare pressure control box (item 301).
warm area. Do not
try to
start the sprayer until
it
has thawed
I t ,
due to exposure to low temperatures, by placing
it
in a
remove the circuit breaker, ONIOFF switch, bridge, circuit
completely. If the bourdon tube was not damaged by the
board and electrical hardware end reinstall these parts in the
bare box.
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 307-793. Troubleshooting continued on nexf page.
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