Graco EM 490 Instructions-Parts List Manual page 15

~
PROBLEM
SOLUTION CAUSE
Excessive surge at spray gun
Remove and clean Spray tip or filter plugged
Spray tip too big or worn
Thin Paint too viscous
Change spray tip
Wrong type hose .Use minimum
50 ft
(15.2 m) static free
nylon hose (wire braid hose unacceptable)
Not enough paint pressure
I
Pressure setting too tow llncrease
Spray tip too big or worn Change spray tip
pressurization
,
Pressure control frozen or damaged by over Thaw", change, remove or cleanof*,
repiace, see page 20
I
Worn pump pans Service, nee manual
307-793
~.
Tails or fingers in spray pattern
I
Pressure setting too
low
I
Increase
I
Outlet filter diny or plugged
Spray tip too big or worn
Clean-see manual
307-273
Use minimum 50 ft (15.2 m) static free n) Wrong type hose
Thin
Paint too viscous
Fill Paint supply low or pail'empty
Change spray tip
Spray tip too big or worn Change spray tip
Sprayer sucking air or gun needle not seating Tighten fittings, service gun-see
manual
I
"
Paint runs or sags
Spitting from spray gun
Fill Paint suppiy.low or pail empty
hose (wire braid hose unacceptable)
" _ " _
I
Static sparking from spray gun
Sprayer or work not grounded
I;Iu/-b;u
ICheck, ground
*The electric motor has an overheating protector switch which automatically reset8 on cooling. If
it
opens and the electric
overheating. Always
use
the
lowest
pressure setting needed.
motor shuts itself off, unplug the power cord and
let the sprayer cool for 30 to
Bo
minutes. Also try
to correct
the wuse
of
**Freezing results fmm.failure to replace water-base paint or flushing water with mineral spirits solvent.
**"Over pressurization results from (1) using
less
than
M
ft (15.2 m) of nylon spray hose, (2) using a wire braid spray
hose.
(3)
adding
a
shutoff device
between
the pump outlet and the spray gun,
(4)
attaching
a
spray hose to
the
filter drain
vaive/preapure relief valve, or
(5) using e clogged or incorrectly assembled filter.
307-735
15
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