Graco 220-834, Instructions-Parts List Manual

Page: 9 / 28

9
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. W ater frozen in the pressure
control tube prevents the sprayer from being started
and causes serious 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 mineral spir-
its, 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 miner-
al 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 1 1.
2. Close the pressure drain valve. See Fig 10.
PRESSURE
DRAIN
VALVE
Fig 7–10 0119
FILTER
BOWL
FILTER
SUPPORT
SCREEN
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 and tip guard, if installed, and
clean separately.
5. Turn the pressure adjusting knob all the way counter-
clockwise to the lowest setting.
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 1 1.
WARNING
6. Disengage the gun safety latch. Hold a metal part of
the gun firmly against and aimed into a grounded met-
al pail. 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.
NOTE: If the pump is hard to prime, open the pressure
drain valve. When fluid comes from the drain
tube, close the valve. Repeat Step 6.
7. Check all fluid connections for leaks. Relieve pres-
sure before tightening the connections. Start the
sprayer.
8. Remove the suction tube from the pail. Disengage 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! Re-
lieve pressure.
9. Leave the pressure drain valve open until you use the
sprayer again.
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. Relieve pressure.
11. Remove the suction tube and hose and clean them
separately. Flushing alone is not sufficient to remove
paint buildup.
MAINTAIN FIRM
METAL-TO-METAL
CONTACT BETWEEN
GUN AND GROUNDED
METAL CONTAINER
GROUND
WIRE
Fig 7–11
0117