Pressure Relief Procedure - Graco PT2500 Instructions-Parts List Manual

CAUTION
The wallet sized warning card provided with the gun
should be kept with the operator at all times. The card
contains important information on reducing the risk of
a fluid injection injury, and treatment information
should an injection injury occur. Additional copies of
this card are available at no cost.

Pressure Relief Procedure

WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
or install or clean the spray tip.
1. Shut off the sprayer and unplug it.
2. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun into the
pail to relieve pressure.
3. Lock the trigger safety lever.
4. Turn the bypass valve counterclockwise one turn
to drain paint back into the pail.
Startup
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above , VERY SLOWLY loos-
en the tip guard retaining nut or hose end coupling to
relieve pressure gradually, then loosen completely.
Now clear the tip or hose obstruction.
1. Open the bypass valve (66) ONE turn counter-
clockwise. Do not place the pump intake in the pail
yet. See Fig. 3.
2. Turn the pressure control fully (4) clockwise to in-
crease pressure. See Fig. 3.
3. Remove the inlet strainer (27) and place your hand
over the inlet valve to be sure it is drawing a vacuum.
NOTE: If the inlet valve (26) is not drawing a vacuum,
turn the sprayer OFF. Turn the sprayer over. Press down
on the stem (A) inside the inlet valve lightly with a small
screwdriver, and pour about a teaspoon of mineral spirits
or solvent into the valve. See Fig. 4. Release the valve
and turn the sprayer upright. With the pressure turned up,
turn on the sprayer. This should free any sticking parts in
the pump. Now check again for a vacuum. Shut off the
sprayer and install the inlet strainer (27).
4. Place the paint pump assembly into a properly pre-
pared 5 gallon pail of paint.
5. Turn the sprayer ON and allow the paint to circulate
through the bypass valve (4) for one or two minutes.
NOTE: If the paint does not circulate back into the pail,
turn down the pressure and turn the motor on and off sev-
eral times to help prime the sprayer.