When To Flush; How To Flush - Graco GM 5000 Instructions And Parts List

When to Flush

1. New Sprayer. This unit was factory tested in light-
weight oil, which was left in to protect the pump.
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.
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, then 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.
CAUTION
NEVER leave water in the sprayer if there is the
slightest chance it could freeze. Push the water out
with mineral spirits. Water frozen in the pressure con-
trol tube prevents the sprayer from being started, and
causes serious damage to the pressure control.
5. Storage.
Water base paint: flush with water, then mineral spir-
its and leave the pump, hose and gun filled with min-
eral spirits. Shut off the sprayer, remove the spark
plug cable, and open the pressure drain valve to re-
lieve pressure. Leave the drain valve open.
Oil base paint: flush with mineral spirits and leave the
pump, hose and gun filled with mineral spirits. Shut
off the sprayer, remove the spark plug cable, and
open the pressure drain valve to relieve pressure.
Leave the drain valve open.
6. Startup after storage.
Before using water–base paint , flush out mineral
spirits with soapy water, and then with clean water.
When using oil–based paint, flush out the mineral
spirits with the paint to be sprayed.

How to Flush

NOTE: "Solvent" refers to water or oil-based solvent.
1. Relieve pressure. See page 14.
2. Remove the filter bowl (R) and screen (S); see in-
struction manual 307–273, supplied. Install the bowl
and support (T), without the screen, to flush. Clean
the screen separately. See Fig. 5.
3. Close the pressure drain valve (53).
4. Put the suction tube in a grounded pail of solvent.
5. Remove the spray tip from the gun(s).
Flushing
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, and aimed into, a grounded metal pail .
6. Follow Startup on page 12. Keep the gun triggered
until clean solvent comes from the nozzle. Release
the trigger and engage the trigger safety latch.
NOTE: For two guns, release the trigger safety latch on
the second gun and trigger that gun until clean solvent
comes from the nozzle. Flush the first gun and then the
second gun at least one more time.
7. Check all fluid connections for leaks. Relieve pres-
sure before tightening any connections. Start the
sprayer. Recheck the connections for leaks.
8. Remove the suction tube from the solvent pail. Dis-
engage the trigger safety latch. Trigger the gun to
force solvent from the hose. Do not let the pump run
dry for more than 30 seconds, to avoid damaging the
pump packings. Relieve pressure.
9. Remove the strainer, suction tube and suction hose
and clean them separately to be sure all paint sedi-
ment is removed. Dried paint can build up in these
parts and later cause performance problems.
10. Unscrew the filter bowl and reinstall the clean
screen. Reinstall the bowl, hand tight only.
11. Follow Storage or Changing Colors, to the left. Re-
lieve pressure.
Fig. 5
WARNING
Maintain firm
metal-to-metal
contact when
flushing
R
S
T
53
0142