Graco HIGH-FLO 243737, Instructions Manual, Page: 13 / 40

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Operation
Pressure Relief Procedure
WARNING
PRESSURIZED EQUIPMENT HAZARD
The system pressure must be manually relieved to
prevent the system from starting or spraying acci-
dentally. To reduce the risk of an injury from acci-
dental spray from the gun, splashing fluid, or
moving parts, follow the Pressure Relief Proce-
dure whenever you:
D
are instructed to relieve the pressure,
D
stop spraying,
D
check or service any of the system equipment,
D
or install or clean the spray nozzle.
1. Shut off the power to the pump.
2. In an air-powered system, close the air regulator
(J) and close the bleed-type master air valve (L).
3. In a hydraulic-powered system, close the hy-
draulic supply line shutoff valve (G) first, then the
return line shutoff valve (M).
4. Close the fluid shutoff valves from the supply
tanks.
5. Open the dispensing valve, if used, or slowly and
carefully loosen a fluid fitting near the pump to
relieve pressure.
Flush the Pump
Flush the pump before using it the first time to remove
the lightweight oil which was left in the pump after
factory testing to protect it from corrosion. Flush with a
compatible solvent until your pump and lines are
thoroughly cleaned. Follow the Pressure Relief Pro-
cedure at left and remove the spray tip before flush-
ing. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and always use the lowest possi-
ble pressure when flushing.