Graco 311211L important safety instructions Operation

Operation

Operation

Pressure Relief Procedure

1.Engage trigger lock.

2.Air-Powered Pumps only: Close the bleed-type master air valve.

Hydraulic-Powered Pumps only: Shut off the hydraulic supply line valve (S) first, then the return line valve (R).

3.Disengage the trigger lock.

4.Hold a metal part of the gun firmly to a grounded metal pail. Trigger the gun to relieve pressure.

5.Engage the trigger lock.

6.Open all fluid drain valves in the system, having waste containers ready to catch drainage. Leave the drain valves open until you are ready to spray again.

7.If you suspect the spray tip or hose is clogged or that pressure has not been fully relieved after follow- ing the steps above, VERY SLOWLY loosen the tip guard retaining nut or hose end coupling to relieve pressure gradually, then loosen completely. Clear hose or tip obstruction.

CAUTION

Hydraulic-Powered Pumps only: When shutting down the hydraulic system, always shut off the hydraulic supply line shutoff valve (S) first, and then the return line shutoff valve (R) to prevent overpressurizing the motor or its seals. When starting the hydraulic sys- tem, open the return line shutoff valve first.

Flush Before Using Equipment

The equipment was tested with lightweight oil, which is left in the fluid passages to protect parts. To avoid con- taminating your fluid with oil, flush the equipment with a compatible solvent before using the equipment. See Flushing, page 13.

Trigger Lock

Always engage the trigger lock when you stop spraying to prevent the gun from being triggered accidentally by hand or if dropped or bumped.

Pump Operation

• In a circulation system, the pump operates con- tinuously until the power supply is shut off.

CAUTION

Do not allow the pump to run quickly for a long period of time as this may damage the packings.

•In a direct-supply system, the pump starts when the gun is opened, and stops when the gun is closed.

•Perform a stall test periodically to ensure the piston seal is in good working condition and prevent system overpressurization:

•Close the fluid shutoff valve (D) closest to the pump on the downstroke and be sure that the pump stalls. Open the fluid shutoff valve to restart the pump. Close the fluid shutoff valve

(D) closest to the pump on the upstroke and be sure that the pump stalls.

Stop the Pump at the Bottom of Its Stroke

Relieve the pressure when you stop the pump for any reason. Stop the pump on the downstroke, before the air motor changes over.

CAUTION

Failure to stop the pump at the bottom of its stroke allows fluid to dry on the piston rod, which can cause damage to the throat packings when the pump is restarted.

Hydraulic-Powered Pumps only: Always shut off the

supply line shutoff valve (S) first, and then the return line shutoff valve (R). This is to prevent over- pressurizing the motor or its seals.

12 311211L