Graco 308-017 warranty Operation/Maintenance, Packing Nut/Wet-Cup, Flushing the Pump

OPERATION/MAINTENANCE

WARNING

Pressure Relief Procedure

To reduce the risk of serious bodily injury, including fluid injection, splashing in the eyes or on the skin, or injury from moving parts, always follow this proce- dure whenever you shut off the pump, when check- ing or servicing any part of the spray/dispensing sys- tem, when installing, cleaning or changing spray tips/nozzles, and whenever you stop spraying/dis- pensing.

1.Engage the spray gun/dispensing valve safety latch.

2.Shut off the air to the pump.

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

4.Disengage 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.Engage the gun/valve safety latch.

7.Open the drain valve (required in your system)

and/or the pump bleeder valve, having a con- tainer 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 or hose end coupling and relieve pressure gradually , then loosen completely. Now clear the tip 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. 2. Ad- just the packing nut weekly so it is just snug; do not over- tighten. Follow the Pressure Relief Procedure W arn- ing above before adjusting the packing nut.

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 sol- vent before using the pump.

WARNING

For your safety , read the warning section, FIRE OR EXPLOSION HAZARD on page 3 before flush- ing, and follow all recommendations given there.

Starting and Adjusting the Pump

See the TYPICAL INSTALLATION on page 4. If you are using a ram or wiper plate with the pump, refer to the sep- arate instructions for those components for set-up and operation instructions.

Lower the pump into a fluid container . Be sure the air regulator (H) and pump’s bleed-type master air valve (G) are closed. Then open the bleed valve (G). Hold a metal part of the spray gun/dispensing valve (N) firmly to the side of a grounded metal pail and hold the trigger open. Now slowly open the air regulator until the pump starts.

6


WARNING

Moving parts can pinch or amputate your fingers or other body parts. When the pump is operating, the priming piston (25) (located at the pump intake) and the air motor piston (located behind the air motor plates or shield) move. See Fig. 2. Therefore, NEVER operate the pump with the air motor plates or shield removed, and keep your fingers and hands away from the priming piston.

Before attempting to clear an obstruction from the priming piston (25) or service the pump, follow the Pressure Relief Procedure Warning at left to pre- vent the pump from starting accidentally.

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

(35)slightly. Use the bleed hole (R), on the underside of the valve, as a priming valve until the fluid appears at the hole. See Fig 2. Close the bleeder valve.

NOTE: When changing fluid containers with the hose and gun already primed, open the bleeder valve (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 bleeder hole (R) when priming the pump.

With the pump and lines primed, and with adequate air pressure and volume supplied, the pump will start and stop as the gun/valve is opened and closed.

Use the air regulator (H) to control the pump speed and the fluid pressure. Always use the lowest air pressure necessary to get the desired results. Higher pressures cause premature tip/nozzle and pump wear.

WARNING

To reduce the risk of overpressurizing your system, which could result in component rupture and cause serious bodily injury, NEVER exceed the specified

MAXIMUM INCOMING AIR PRESSURE to the pump (see the Technical Data on pages 24-29).

Never allow the pump to run dry of the fluid being pumped. A dry pump will quickly accelerate to a high speed, possibly damaging itself. A pump runaway valve (E), which shuts off the air supply to the pump if the pump accelerates beyond the pre-set speed, is available. See the Typical Installation on page 4 and ACCESSORIES on pages 22 and 23. If your pump accelerates quickly, or is running too fast, stop it immediately and check the fluid supply. If the supply container is empty and air has been pumped into the lines, refill the container and prime the pump and the lines with fluid, or flush and leave it filled with a compatible solvent. Be sure to eliminate all air from the fluid system.