Graco 308738C manual Operation, Pressure Relief Procedure, Flush the Pump Before First Use

Operation

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:

Dare instructed to relieve the pressure,

Dstop spraying,

Dcheck or service any of the system equipment,

Dor install or clean the spray tip.

1.Lock the gun trigger safety.

2.Shut off the air supply to the pump.

3.Close the bleed-type master air valve (required in your system).

4.Unlock the gun/valve trigger safety.

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

6.Lock the gun/valve trigger safety.

7.Open the drain valve (required in your system), and have a container ready to catch the drainage.

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

If you suspect that the spray tip/nozzle or hose is completely clogged, or that pressure has not been fully relieved after following the steps above, very slowly loosen the tip guard retaining nut or hose end coupling and relieve pressure gradually, then loosen it completely. Then clear the tip/nozzle or hose.

Flush the Pump Before First Use

The pump is tested with lightweight oil, which is left in to protect the pump parts. If the fluid you are using may be contaminated by the oil, flush it out with a compatible solvent before using the pump. If the pump is being used to supply a circulating system, allow the solvent to circulate until the pump is thoroughly flushed. See Flushing the Pump on page 9.

Packing Nut/Wet-Cup

WARNING

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

Keep the packing nut/wet-cup (S) filled with Graco Throat Seal Liquid (TSL) or compatible solvent to help prolong the packing life. Check the tightness of the packing nut weekly; tighten just enough to prevent leakage; do not overtighten it. See Fig. 3 on page 11. Relieve the pressure before adjusting the packing nut or adding TSL.

Starting and Adjusting the Pump

Begin these steps before you install the spray tip/nozzle.

1.Ensure that the air regulator (E) and bleed-type master air valve (D) are closed. See Fig. 2 on page 6.

2.Hold a metal part of the gun/valve firmly to the side of a grounded metal pail and hold the trigger open.

3.Open the pump’s bleed-type master air valve (D).

4.Slowly open the air regulator (E) until the pump starts; approximately 2.8 bar (0.28 MPa, 40 psi).

5.Cycle the pump slowly until all the air is pushed out and the pump and hoses are fully primed.

6.Release the gun/valve trigger and lock the trigger safety. The pump should stall against pressure when you release the trigger.

WARNING

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

7.Relieve the pressure.

8.Install the spray tip/nozzle in the gun/valve.

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