Graco Ultra 1000 - Page 16

16
307–785
TROUBLESHOOTING GUIDE
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury , including
fluid injection, injury from splashing fluid or solvent in
the eyes or on the skin, moving parts or electric shock,
always follow this procedure whenever you shut of f the
sprayer, when checking or servicing any part of the
spray system, when installing, cleaning or changing
spray
tips, and whenever you stop spraying.
1. Engage the gun safety latch.
2. T urn the ON/OFF switch to OFF .
3. Unplug the power supply cord.
4. Disengage the gun safety latch. Hold a metal part
of the gun firmly to a grounded metal pail. T rigger
the
gun to relieve pressure.
5. Engage the gun safety latch.
6. Open the pressure drain valve, having a container
ready to catch the drainage. Leave the pressure
drain
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 af -
ter
following the steps above, wrap a rag around the tip
guard retaining nut or hose end coupling and VER Y
SLOWLY
loosen the part to relieve pressure gradually ,
then loosen completely . Now clear the tip or hose
obstruction.
Check
everything in the guide before disassembling the sprayer .
MOTOR WON’T OPERA TE
TYPE OF PROBLEM
WHAT T O CHECK
If check is OK, go to next check
WHA T T O DO
When check is not OK refer to this column
Basic Fluid Pressure Problems
1. Check the pressure control knob setting. The
motor will not run if it is at the minimum setting
(fully counterclockwise).
1. Slowly increase the pressure setting to see
if the motor starts.
2. Check for a clogged spray tip. Refer to the
separate
gun or tip instruction manual.
2. Relieve pressure, refer to the separate gun
or tip instruction manual for tip cleaning.
Basic Mechanical Problems 1. Check for frozen or hardened paint in the
pump (76) and/or pressure control tube. Us-
ing
a screwdriver , carefully try to rotate fan at
back of motor by hand. See page 22.
1. Thaw. Plug in sprayer and turn on. Slowly
increase pressure setting to see if motor
starts.
If it doesn’t, see NOTE 1, below .
2. Check displacement pump connecting rod
pin (43). It must be completely pushed into
connecting
rod (68) and retaining spring (42)
must be firmly in groove of connecting rod.
See
page 35.
2. Push pin into place and secure with the
spring
retainer .
3. Check for motor damage. Remove drive
housing assembly (67). See page 33. Try to
rotate
fan by hand.
3. Replace motor (73) if fan won’t turn.
Basic Electrical Problems 1. Check sprayer circuit breaker (309) button to
be sure it has not popped up.
1. Depress button to reset. If circuit breaker
continues
to open, see ‘Electrical Short’ on
page 22.
2. Check electrical supply with volt meter . Meter
should read 105–125 V AC.
2. Reset building circuit breaker; replace
building
fuse. T ry another outlet.
3. Check extension cord for visible damage.
Use
a volt meter or test lamp at extension cord
outlet to check.
3. Replace extension cord.
4. Check sprayer power supply cord (31 1) for
visible damage such as broken insulation or
wires.
4. Replace power supply cord. See page 26.
5. Check motor brush leads, terminals and
brush length. Brush length should be 1/2”
minimum.
See page 25.
5. Tighten terminal screws; replace brushes.
See page 25.
NOTE 1: Thaw the sprayer if water or water–based paint has
frozen
in it, due to exposure to low temperatures, by placing it
in a warm area. Do not try to start the sprayer until it has thawed
completely. If the bourdon tube was not damaged by the freez -
ing, the pump should operate. If paint hardened (dried) in the
sprayer,
the pump packings and/or bare pressure control must
be replaced. See page 37 (pump) or 29 (pressure control).