Graco 222839 Series A Flush the Pump Before First Use, Starting and Adjusting the Pump, Operation

Operation

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. See Flushing on page 10.

Starting and Adjusting the Pump

WARNING

MOVING PARTS HAZARD

See Fig. 3. The priming piston (23) and the air motor piston (located behind the air motor plates) move during operation.

Keep hands and fingers away from the priming piston (23) during operation and whenever the pump is charged with air. The priming piston ex- tends beyond the intake cylinder (20) to pull materi- al into the pump and can amputate a hand or finger caught between it and the intake cylinder. Follow the Pressure Relief Procedure on page 8, before checking, clearing, or cleaning the priming piston to prevent the pump from starting acciden- tally.

Never operate the pump with the air motor plates removed.

See the Installation on page 7. If you are using a pneumatic elevator cart or 19 liter (5 gallon) ram with the pump, refer to the separate instructions for those components for set-up and operation instructions.

Lower the pump into a fluid container. Be sure the air regulator (K) and bleed-type master air valve (J) are closed. Then open the bleed valve (J). Hold a metal part of the spray gun/dispensing 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 (33) slightly. See Fig. 7 on page 16. Use the bleeder hole (on the underside of the valve housing) as a priming valve until the fluid appears at the hole. Close the bleeder valve.

NOTE: When changing fluid containers with the hose and gun already primed, be sure to open the bleeder valve (33), to assist in priming the pump and venting air before it enters the hose. Close the valve when all air has been eliminated.

WARNING

SKIN INJECTION HAZARD

To reduce the risk of fluid injection, do not use your hand or fingers to cover the bleed hole on the underside of the bleeder valve body when priming the pump. Use a crescent wrench to open and close the bleeder plug. Keep your hands away from the bleed hole.

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

Use the air regulator (K) 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 the system, which could result in component rupture and cause serious injury, NEVER exceed the specified maxi- mum incoming air pressure to the pump (see the Technical Data on pages 24–27).

CAUTION

Do not allow the pump to run dry. It will quickly accelerate to a high speed, causing damage. A pump runaway valve (G), which shuts off the air supply to the pump if the pump accelerates beyond the pre-set speed, is available. See the Typical Installation in Fig. 2. 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.

308200 9