Flushing Guidelines - Graco ULTRA 500 231-032 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
CAUTION
NEVER allow water to freeze in the pressure
control. Doing so prevents the sprayer from being
started and causes serious damage to the pressure
control. Pump the water out with mineral spirits.
WARNING
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 4. Engage the gun safety latch.
2. Turn the pressure adjusting knob fully counterclock-
wise to the minimum 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 15–1.
4. Put the suction tube into a grounded metal pail with
1/2 gallon of compatible solvent.

FLUSHING GUIDELINES

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
5. Start the sprayer. See page 12. To save the fluid still
6. Do not run the pump dry for more than 30 seconds
7. Follow the illustrated Pressure Relief Procedure on
8. Unscrew the filter bowl and reinstall the clean
SCREEN
FILTER
SUPPORT
Fig 15–1
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
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. Circulate the flushing
fluid a couple of minutes to thoroughly clean the
system.
to avoid damaging the pump packings!
page 4. Engage the gun safety latch.
screen. Install the
tighten.
FILTER
BOWL
PRESSURE
DRAIN VALVE
bowl and hand
15
307–758