Flushing - Graco LineLazer GM 3500 Manuel D'instructions

WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
Be sure the pump is properly grounded.
CAUTION
Never leave water in the sprayer if the is any chance
it could freeze. Push the water out with compatible
solvent. Water frozen in the pressure control tube
prevents the sprayer from being started, and causes
serious damage to the pressure control.
When to Flush
1. Flush a new sprayer to remove the protective oil.
Before using water–base paint, use compatible sol-
vent, then soapy water, and then clean water.
Before using oil–base paint, use compatible solvent.
2. Changing colors. Use a compatible solvent.
3. Changing from water–base to oil–base paint. Use
warm, soapy water, and then a compatible solvent.
4. Changing from oil–base to water–base paint. Use a
compatible solvent, then warm, soapy water, and
then clean water.
5. Storage. After the compatible solvent flush, relieve
pressure, but do not drain the compatible solvent.
6. Startup after storage.
Before using water–base paint , flush out the compat-
ible solvent with soapy water, and then with clean
water.
When using oil–based paint, flush out the compatible
solvent with the paint to be sprayed.
How to Flush
1. Relieve pressure.
2. Remove the filter bowl (A) and screen (B); see manu-
al 307–273. Install the bowl and support (C), without
the screen, to flush it. Clean the screen separately.
See Fig. 8.
3. Close the pressure drain valve (13).
4. Put the suction tube in a grounded pail of water or
solvent.
5. Remove the gun(s) from the holder. Remove the
spray tip(s) to prevent splashing.

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 13. Keep the gun triggered
until clean water or solvent comes from the nozzle.
See Fig. 9. Release the trigger and engage the gun
safety latch.
NOTE: If you have two guns, release the trigger safety
latch on the second gun and trigger that gun until clean
water or solvent comes from the nozzle. To ensure that
the hoses are well-flushed, 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 gun safety latch. Trigger the gun to force
water or solvent from the hose. Do not let the pump
run dry for more than 30 seconds to avoid damaging
the pump packings! Relieve pressure.
B
C
Fig. 8
Maintain firm metal-
to-metal contact
when flushing to
reduce the chance
of static sparking
and splashing.
Fig. 9
9. If you have been spraying paint, remove the strainer,
suction tube and suction hose and clean them sepa-
rately to be sure all paint sediment is removed. Dried
paint in the suction tube assembly can build up and
cause performance problems later on.
10. Install the clean filter screen. Install the filter bowl and
hand tighten.
11. See Storage or Changing Colors, above. Relieve
pressure.
WARNING
13
A
0013
0014