Graco D Series Instructions Manual page 7

Connect the Fluid Lines
Connect a grounded fluid line (D) from the pump to the
1/4 npsm fluid inlet adapter (17) of the gun. You should
install a fluid pressure regulator (R) to control fluid
pressure to the gun. A regulator enables you to control
fluid pressure more accurately than by regulating air
pressure to the pump.
In a circulating system, connect a return line (G) from
the 3/8 npt circulating port (X) to the back pressure
valve (C). The back pressure valve ensures regulated
pressure to all spray guns in the system.
System Accessories
WARNING
Two accessories are required in your system: a
bleed-type master air valve (P) and a fluid drain
valve (H). These accessories help reduce the risk
of serious injury including fluid injection, splashing
in the eyes or on the skin, and injury from moving
parts if you are adjusting or repairing the pump.
The bleed-type master air valves required only with
air-powered pumps. It relieves air trapped between
this valve and the pump after the air regulator is
shut off. Trapped air can cause the pump to cycle
unexpectedly. Locate the valve close to the pump.
The fluid drain valve assists in relieving fluid pres-
sure in the displacement pump, hose, and gun;
triggering the gun to relieve pressure may not be
sufficient.
Installation
Flush the System
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8. Use the
lowest possible fluid pressure during flushing to
reduce the risk of fluid injection, static sparking,
and splashing in the eyes or on the skin.
Before flushing, be sure the entire system and flushing
pails are properly grounded. Refer to Grounding at
left. Relieve the pressure and remove the spray tip
from the gun. Start the pump and flush the system with
a compatible solvent as explained in the instructions
for your pump. Check the system under pressure for
leaks; if any are found, relieve the pressure and
repair the leaks. Pressurize the system again and
make sure the leaking has stopped.
Installing or Changing the Spray Tip
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Relieve the pressure and close the air valves. Un-
screw the tip retainer (21) and install the tip, then
tighten the retainer. See Fig. 1. Be sure the gasket
(19) is installed between the tip and valve seat (23) to
prevent leaking. See Fig. 2, page 9. If you are using a
tip filter accessory kit, remove the tip retainer (21) and
gasket (19) and install the kit with your tip.
The spray tip position determines the direction of
pattern width. To adjust the pattern, loosen the tip
retainer (21) and position the tip so the groove is
horizontal for a horizontal pattern and vertical for a
vertical pattern. Tighten the retainer.
WARNING
WARNING
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