Graco Inc 236-066, 308-333 manual Operation, Pressure Relief Procedure, Flush the Pump Before Using

Operation

Pressure Relief Procedure

WARNING

INJECTION HAZARD

Fluid under high pressure can be in- jected 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:

Dare instructed to relieve the pressure,

Dstop spraying,

Dcheck or service any of the system equipment,

Dor install or clean any part of the system.

1.Lock the spray gun safety latch.

2.Close the bleed-type master air valve (supplied in your system).

3.Shut off the air regulators.

4.Unlock the spray gun safety latch.

5.Hold a metal part of the gun firmly to the side of a grounded metal pail, and trigger the gun to relieve pressure.

6.Lock the spray gun safety latch.

7.Open the drain valve (supplied in your system), having a container ready to catch the drainage.

8.Leave the drain valve open until you area ready to spray again.

If you suspect that the spray tip or hose is completely clogged or that pressure has not been fully relieved, very slowly loosen the tip retaining nut or hose end coupling and relieve pressure gradually. Clean the tip or hose obstruction.

Flush the Pump Before Using

Pumps are tested in lightweight oil which is left in to protect the pump parts. To prevent contamination of the fluid, flush the pump with a compatible solvent before using it.

WARNING

Before flushing, be sure the entire system and flushing pails are properly grounded. Refer to Grounding on page 4. Follow the Pressure Relief Procedure above and remove the spray tip from the gun. Always use the lowest possible fluid pressure, and maintain firm metal-to-metal contact between the gun and the pail during flushing to reduce the risk of fluid injection, static sparking, and splashing in the eyes or on the skin.

Starting and Adjusting the Pump

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 7.

See Fig. 3. Be sure the air regulators (10a and 10b) and bleed-type master air valve (16) are closed. Do not install the spray tip yet.

Screw the bung adapter (34) into the container's bung hole, slide the suction tube through the adapter into the container, and tighten the thumbscrew (33) to secure. Position the tube so its end is about 1/2 in. (13 mm) off the bottom of the container.

Open the drain valve (6) to prime the pump. Open the bleed-type master air valve (16). Open the gun air regulator (10a). Hold a metal part of the spray gun firmly to the side of a grounded metal pail and trigger the gun.

Slowly open the pump air regulator (10b) until the pump starts. Run the pump slowly until fluid comes from the drain valve (6).

Close the drain valve and continue to run the pump until all the air is pushed out of the fluid lines. Release the gun trigger and lock the safety latch; the pump will stall against the pressure.

With the pump and lines primed, and with adequate air pressure and volume supplied, the pump will start and stop as the spray gun is triggered and released.

Relieve the pressure, then install the spray tip in the gun.

Use the pump air regulator (10b) to control the pump speed and fluid pressure. Always use the lowest pressure necessary to achieve the desired results. Higher pressures waste fluid and cause premature wear of the pump packings and spray tip.

Keep the packing nut/wet-cup filled with Graco Throat Seal Liquid (TSL) to help prolong the packing life. Check the tightness of the packing nut weekly. The packing nut should be tight enough to prevent leakage

±no tighter. Always relieve the pressure before adjusting the packing nut.

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