Graco A Series Instructions-Parts List Manual page 12

FLUSHING
GUIDELINES
When to Flush
1: New Sprayer. Your new UltraTM 500 Sprayer was
factoly tested in lightweight oil which was left in to spirits end leave the pump, hose and gun filled with
Water-base palnt: flush with watar, then mineral
protect pump parts. mineral spirits. Shut off and unplug the sprayer,
Before uslng water-base palnt, flush with mineral
spirits, followed by soapy water, and then a clean
open the pressure relief valve to relieve pressure
water flush.
and leave open.
Oil-base pelnt: flush with mineral spirits. Shut off
Before uslng olbbase palnt, flush with mineral
spirits only. valve to relieve pressure and leave open.
and unplug the sprayer, open the pressure relief
2.
Changing Colors. Flush with e compatible solvent 6. Startup after storage.
such as mineral spirits or water. Before uslng water-base palnt, flush out mineral
3.
Changing from water-base t o oli-base paint.
spirits with soapy water and then a clean water
Flush with soapy water, then mineral spirits.
flush.
When uslng oll-base pelnt, flush out the mineral
4. Changing from oil-base t o water-bdse palnt. spirits with the paint to be sprayed and the sprayer
Flush with mineral spirits, followed by soapy water,
then a clean water flush.
is ready to use.
5. Storage.
H o w t o Flush
1. Follow the Pressure Rellef Procedure Warnlng
on page 2
or 10.
2. Remove the filter bowl and screen; see manual
307-273 supplied. Clean the screen separately and
install the bowl without the screen to flush
it.
See
Fig 8.
m J
8
3 . Close the filter pressure relief valve.
4. Pour one-half gallon (2 liters) of compatible solvent
into e bare metal pail. Put the suction tube in the
pail.
5. Remove
the
spray tip from the gun.
6. Disengage the
gun safety latch. Point the spray gun
into a metal waste container end with a metal part
o f
the gun firmly touching the metal container,
squeeze the gun trigger. See Fig 9. Thls prcr
cedure helps reduce the rlsk of sratlc sparklng
and splashlng. With the gun triggered, turn the
adjusting knob clockwise just untll the sprayer
ONlOFF switch to ON and slowly turn the pressure
starts.
Keep the gun triggered until clean solvent
comes from the nozzle. Release the trigger and
engage the gun safety latch.
MAINTAIN FIRM
CONTACT BETWEEN
GUN AND CONTAINER
7. Check all fluid connections'for leaks. If any leak,
first follow the Pressure Relief Procedure Warn-
start the sprayer, end recheck the connections for
ing on page
2
or 10. Now tighten the connections,
leaks.
8. Remove the suction tube from the pail. Disengage
the gun safety end trigger the gun to force solvent
from the hose.
Do
not let the pump
run
dry for
more than 30 seconds to avold damaglng the
pump packlngsl Then turn ON/OFF switch to OFF
and engage the gun safety.
9. Unplug the power supply cord. Open the pressure
the sprayer again. Unscrew the filter bowl and
relief velve and leave open until you are ready to use
tight only.
reinstall the clean screen. Reinstall the bowl, hand
10. If you have flushed with mineral spirits and are go-
water followed by a clean water flush. Then repeat
ing to use a water-base paint, flush with soapy
Step 1.