Flushing - Graco 231–373 Instructions-Parts List Manual

NOTE: Several flushes are often required to thoroughly clean the system and prepare it for the next fluid to be
sprayed, or to store the sprayer. Use this chart to determine the required flushing order for the fluid you are
using, and then follow the procedure below for flushing.
*Use this category for flushing a brand new sprayer and flushing after storage.
System has Next fluid to be
this fluid in it: this fluid in it: sprayed. sprayed
*Oil-based Oil-based paint –
solvent or paint new color
Oil-based Water-based paint Mineral spirits Warm soapy
solvent or paint
Oil-based Prepare for
solvent or paint storage
Water or water- Water-based paint
based paint – new color
Water or water- Oil-based paint
based paint
Water or water- Prepare for
based paint storage
WARNING
FIRE AND EXPLOSION HAZARD
To reduce the risk of static sparking and
splashing when flushing, always remove
the spray tip from the gun and hold a
metal part of the gun firmly to the side of a
grounded metal pail.
1. Follow the illustrated Pressure Relief Procedure
on page 13. Engage the gun safety latch.
2. Turn the pressure adjusting knob fully counter-
clockwise to zero pressure.
3. Remove the spray tip from the gun. Remove the
filter bowl and screen; see manual 307–273. Clean
the screen separately and install the bowl without
the screen to flush it. See Fig. 8.
4. Put the suction tube into a grounded metal pail
with 1/2 gallon of compatible solvent.
5. Start the sprayer. See page 9. To save the fluid
still in the sprayer, trigger the gun into another
container until the next fluid appears, then trigger
the gun back into the fluid you are pumping. Circu-
late the flushing fluid a couple of minutes to thor-
oughly clean the system.

Flushing

Flushing order:
Flush 1 Flush 2
Mineral spirits none
water
Mineral spirits none
Warm soapy Clean water
water
Warm soapy Clean water
water
Warm soapy Clean water
water
6. Do not run the pump dry for more than 30 seconds
7. Follow the illustrated Pressure Relief Procedure
8. Unscrew the filter bowl and reinstall the clean
9. Remove the suction tube and screen and clean
SCREEN
FILTER
SUPPORT
Fig. 8
Before you spray or store
sprayer: sprayer:
Flush 3
none Prime with oil-based paint
Clean water Prime with water-based
paint
none Relieve pressure,
Leave drain valve open
none Prime with water
Mineral spirits Prime with oil
Mineral spirits Relieve pressure,
Leave drain valve open
to avoid damaging the pump packings!
on page 13. Engage the gun safety latch.
screen. Install the bowl and hand tighten.
them separately.
FILTER
BOWL
PRESSURE
DRAIN VALVE