Graco 308149P Operation, ALL MODELS Pressure Relief Procedure, Packing Nut/Wet-Cup

Operation

(ALL MODELS)

Pressure Relief Procedure

WARNING

SKIN 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/dispensing,

Dcheck or service any of the system equipment,

Dor install or clean the spray tip/nozzle.

1.Engage the gun/valve trigger safety.

2.Shut off the air or hydraulic supply to the pump.

3.In air-powered systems, close the bleed-type master air valve (required in your system). In hydraulic-powered systems, close the hydraulic supply line valve first, then the return line valve.

4.Unlock the gun/valve safety latch.

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 safety latch.

7.Open the drain valve (required in your system) and/or the pump bleeder valve, having a container ready to catch the drainage.

8.Leave the drain valve open until you are ready to spray/dispense 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, nozzle, or hose end coupling and relieve pressure gradually, then loosen completely. Now clear the tip/nozzle or hose.

Packing Nut/Wet-Cup

Fill the packing nut/wet-cup (2) 1/3 full with Graco Throat Seal Liquid (TSL) or compatible solvent. See Fig. 5. Using the supplied wrench (104), adjust the packing nut weekly so it is just snug; do not overtigh- ten. Follow the Pressure Relief Procedure above before adjusting the packing nut.

12 308149

Flushing the Pump

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.

WARNING

Before operating the pump, ground the system as explained under FIRE AND EXPLOSION HAZARD and Grounding on page 5.

(AIR-POWERED MODELS)

Starting and Adjusting the Pump

Supply fluid to the pump, per the requirements of your system.

Refer to Fig. 3 on page 8. Be sure the air regulator

(F)is closed. Then open the pump’s bleed-type master air valve (E). Hold a metal part of the spray gun/dis- pensing valve (S) firmly to the side of a grounded metal pail and hold the trigger open. Now slowly open the air regulator until the pump starts.

Cycle the pump slowly until all the air is pushed out and the pump and hoses are fully primed. Release the spray gun/dispensing valve trigger and engage the safety latch. The pump should stall against pressure when the trigger is released.

If the pump fails to prime properly, open the bleeder valve plug (35) slightly. Use the bleed hole, on the underside of the valve body (34), as a priming valve until the fluid appears at the hole. See Fig. 5. Close the plug (35).

NOTE: When changing fluid containers with the hose and gun already primed, open the bleeder valve plug (35), to assist in priming the pump and venting air before it enters the hose. Close the bleeder valve when all air has been eliminated.

WARNING

To reduce the risk of fluid injection, do not use your hand or fingers to cover the bleed hole when priming the pump.