Troubleshooting Chart - Graco EM 390 Instructions-Parts List Manual

SERVICE
Relief Procedure
Pressure
To reduce the risk of serious bodily injury, including fluid injection; splashing in the eyes or on the skin; injury from
moving parts or electric shock, always follow this procedure whenever you shut off the sprayer, when checking or
servicing any pan of the spray'system, when installing, cleaning or changing spray tips, and whenever you stop
spraying.
2. Turn the switch OFF.
3. Unplug the power supply cord.
4. Disengage the gun safety latch.
5. Hold e metal part of the gun firmly to the side
6. Engage the gun safety latch.
7 . Open the drain valve/pressure relief valve, having a container ready to catch the drainage.
8.
Leave the drain valve/pressure relief valve open until you are ready to spray again.
ing 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.

TROUBLESHOOTING CHART

PROBLEM
Electric motor won't run
Electric motor stops while
spraying
Electric motor runs, but low or
no paint output and pump not
strokino (See PROBLEM "Not
15,
also.)
Electric motor labors when start-
ing, blowing fuses
Paint leaks into wet-CUD
14 307-724
WARNING
a grounded metal pail, and trigger the gun
of
CAUSE
Power or extension cord unplugged or damaged
or building circuit fuse blown
Motor overload switch' has opened
Pressure setting too low
Pressure control frozen or damaged by over
pressurization
Power or extension cord unplugged
or building circuit fuse blown
Motor overload switch' has opened
Pressure setting too low
Spray tip or filter plugged
Wrong type extension cord
Piston ball check not seating
Piston packings worn or damaged
Intake valve ball check not seating
Pump frozen
Filter upside down
Pressure control frozen or damaged by over
pressurization
Gear train damaged
Worn pump parts
Capacitor failure
Circuit board failure
Throat packings worn or damaged
Check, reset or replace
Unplug power cord, relieve pressure,
allow to cool, decrease pressure
Increase
replace, see page
or
damaged
Check, reset or replace
Unplug power cord, relieve pressure,
allow to cool, decrease pressure
Increase
Remove and clean
Use maximum
12 gauge minimum, grounded exten-
sion cord
Service, see 307-793
Replace.
Service, see 307-793
Thaw"
and
Remove reinstall
Thaw' . . change, remove or clean**'
replace, see page
Replace
Service, see 307-793
sprayer,
Prime
Replace capacitor, see page
Replace circuit board, see page
Replace, see 307-793
relieve pressure.
to
3
wires
10
see page
19
21
. .
,
. ..
,
i
!
i