12
FLUSHING GUIDELINES
When To Flush
NEVER leave water in the sprayer if there is
the slightest chance it could freeze. Flush out
the water with mineral spirits. If water freezes
in the pressure control tube, it prevents the
sprayer from being started and causes seri-
ous damage to the pressure control.
CAUTION
1.
New Sprayer.
Flush out the test oil.
Before using water-base paint
, flush with
mineral spirits, followed by a soapy water
flush, and then a clean water flush.
Before using oil-base paint,
flush with miner-
al spirits, only.
2.
Changing Colors.
Flush with a compatible
solvent such as mineral spirits or water.
3.
Changing from water-base to oil-base
paint.
Flush with warm, soapy water, and then
flush with mineral spirits.
4.
Changing from oil-base to water-base
paint.
Flush with mineral spirits, followed by
warm, soapy water, and then a clean water
flush.
5.
Storage.
Flush, leave the pump, hose and gun
filled with mineral spirits. Shut off the sprayer
and open the pressure drain valve to relieve
pressure.
Water-base paint:
Flush with water, and then
mineral spirits.
Oil-base paint:
Flush with mineral spirits.
6.
Startup after storage.
Before using water-base paint,
flush with
soapy water, and then with clean water.
When using oil-based paint
, with the paint to
be sprayed.
How To Flush
1. Relieve pressure. See page 9.
2. Remove the filter bowl and screen; see manu-
al 307–273. Clean the screen. Install the bowl
(only) to flush it.Close the pressure drain
valve. See Fig 12–1.
Fig 12–1
PRESSURE
DRAIN VALVE
SCREEN
SUPPORT
FILTER BOWL
3. Pour one–half gallon (2 liters) of compatible
solvent into a grounded metal pail. Put the
suction tube in the pail.
4. Remove the spray tip.
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. See Fig 12–2.
WARNING
5. Disengage the gun safety latch. Start the
sprayer, trigger the gun, and slowly turn the
pressure adjusting knob clockwise just until the
pump starts. Keep the gun triggered until clean
solvent comes from the nozzle. Release the
trigger and engage the gun safety latch.
6. Check all fluid connections for leaks. Relieve
pressure before tightening the connections.
Start the sprayer.
7. Remove the suction tube from the pail. Disen-
gage the gun safety latch. Trigger the gun to
force solvent from the hose. Do not run the
pump dry for more than 30 seconds to avoid
damaging the pump packings! Relieve
pressure.
8. Unscrew the filter bowl and reinstall the clean
screen. Reinstall the bowl, hand tight only.
Leave the pressure drain valve open until you
use the sprayer again.
9. If you flushed with mineral spirits and are go-
ing to use a water-base paint, flush with soapy
water followed by a clean water flush. Relieve
pressure.
MAINTAIN FIRM
METAL-TO-METAL
CONTACT BETWEEN
GUN AND GROUNDED
METAL CONTAINER
GROUND
WIRE
Fig 12–2
