15
307–785
FLUSHING GUIDELINES
How to Flush
1. Follow
the
Pressure Relief Procedure W
arning
on
page
14.
2. If
the sprayer has been
used before, remove the filter
bowl and screen; see manual 307–273, supplied.
Clean
the
screen separately and install the bowl with
-
out
the screen to flush it.
Refer to Fig 15–1.
Fig 15–1
PRESSURE
DRAIN
V
ALVE
FILTER
BOWL
SCREEN
FIL
TER
SUPPORT
3. Close
the pressure drain valve.
4. Pour
one–half gallon (2 liters) of compatible
solvent
into
a
grounded metal pail. Put the suction tube in the
pail.
5. Remove
the spray tip from the gun, if it is installed.
WARNING
To
reduce the risk of static sparking and splashing,
always
remove the spray tip
form the gun, and hold
a
metal part of
the gun firmly to the side of and aimed
into
a grounded metal pail when flushing.
6. Lower the pressure setting by turning the pressure
adjusting
knob all the way counterclockwise.
7. Hold
a metal part of the gun firmly against and aimed
into a metal waste container .
Refer to Fig 15–2.
Squeeze the trigger and hold it open, turn the ON/
OFF
switch to ON, and slowly
increase the pressure
setting until the sprayer starts. Keep the gun trig-
gered
until all
air is forced out of the system and the
solvent
flows
freely from the gun. Release the trigger
and engage the gun safety latch. This procedure
helps reduce the risk of static sparking and splash-
ing.
NOTE: If the pump is hard to prime, place a container
under the pressure drain valve and open it.
When
fluid comes from the valve, close it. Then
disengage the gun safety latch and proceed as
in
Step 7, above.
8. Remove the suction tube from the pail. Disengage
the
gun safety latch and trigger the gun to force sol
-
vent from the hose. Do not let the pump run dry for
more
than 30 seconds
to avoid damaging the pump
packings! Then follow the Pressure Relief Proce-
dure
W
arning
on page 14.
9. Leave the pressure drain valve open until you are
ready
to use the sprayer again. If the screen was re
-
moved,
unscrew the filter bowl and reinstall the clean
screen.
Reinstall the bowl, hand tight only
.
10. If
you flushed with
mineral spirits and are going to use
a
water–base paint,
flush with soapy water followed
by
a clean water flush. Then follow the
Pressure Re
-
lief
Procedure W
arning
on page 14.
Fig 15–2
MAINTAIN
FIRM
MET
AL T
O MET
AL
CONT
ACT WHEN
FLUSHING
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