Graco EM 490 Instructions-Parts List Manual page 14

SERVICE
P r e u u m
Rellef
Procedure
WARNING
To reduce the risk of wrious bodily injury, including fluid injection; splashing in the eyes or on the skin; injury from
servicing any part of the spray m e m , when installing, cleaning or changing spray t i p s , end whenever you stop
moving parts or electric shock,
a l w w
follow this procedure whenever you shut off the sprayer, when checking
01
2.
Turn the ON/OFF ewitch OFF.
1. Engage the gun safety latch.
3.
Unplug the powsr eupply cord.
'
4. Disengage the gun safety latch.
6. Hold a metal
part
of
the gun firmly to the
side
of e grounded
metal
pail, end trigger the gun to relieve pressure.
6.
Engage the gun
safetv
latch.
7.
Open the drain valve/pressure relief valve, having
s
container reedy to catch the drainage.
8.
Leave the drain valve/preseure relief valve open until you era reedy to spray again.
If you suspeci the spray
tip
or
hose is
completely dogged, or
th8tpressure
has
not been
fully
relieved after foilow-
gradually, then loown completely. Now clear the tip or hose.
ing the steps above, VERY SLOWLY loosen the tip guard retaining nut or hose end coupling end relieve pressure
spraying.
"
PROBLEM
Electric motor won't run
Electric motor stops while
spraying
Electric motor runs, but low or
no
paint output and pump not
stroking iSee PROBLEM "Not
Enough paint pressure", on page
15.
also.)
Electric motor labors when stan-
n g , Mowlng fuses
'aint leaks intb wet-CUD
CAUSE
Power or extension cord unplugged, or damaged
or building circuit fuse blown
Motor overload switch" has opened
Pressure setting too low
Dressurization
Pressure control frozen or damaged by over
circuit fuse blown
Power or extension cord unplugged, or building
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
Sprayer not primed
Capacitor failure
Circuit board failure
Throat packings worn or damaged
SOLUTION
Check, reset or replace
Unplug power cord, relieve pressure,
allow to cool, decrease pressure
Increase
Thaw", change, remove or cl e an' . .
replace, see page 20
Check, reset or replace
Unplug power cord, relieve pressure,
allow to cool, decrease pressure
Increase
Remove and clean
Use maximum 50
ft
115.2 m),
3
wires
12 gauge minimum, grounded exten-
sion cord
Service, we 307-793
Replace,
888
307-793
Service,
see 307-793
Thew*'
Remove
and reinstell
Thaw' . ,
change, remove or clean***,
replace,
see
page 20
Replace
Service,
sea 307-793
Prime sorwer. we mae 10
Replace capacitor,
see
page 16
Replace circuit board, see page 21
Replrim,
see
307-793
1
. .
. .
14
307-735