Graco 308791E Operation, Setting the Cup Air Pressure, Setting the Gun Air Pressure

Operation

WARNING

Never exceed 20 psi (1.4 bar) static air pressure to the cup. Exceeding the maximum working pressure of the cup or any other system component could cause component rupture, which could result in serious injury and property damage.

WARNING

Pressure Relief Procedure

A

M

K

L

To reduce the risk of serious injury, including splash- ing in the eyes or on the skin, always follow this procedure after you stop spraying, when checking or servicing any part of the spray system, before dis- connecting the gun, air regulator, or pressure cup and when removing a pressure cup for refilling or

Fig. 4

7611A

cleaning.

1.Turn off the air supply to the gun.

2.Trigger the gun into a grounded metal waste container to relieve fluid pressure.

3.Place the cup on a table and slowly release the clamp (A) to bleed-off any residual pressure in the cup. See Fig. 4. Be sure to push the clamp lever fully to the clamped position before turning on the air supply to the gun again.

Setting the Cup Air Pressure

1.Pull up the cup regulator adjustment knob lock-ring (L); this allows the knob (K) to turn. See Fig. 4.

2.Set the cup pressure at zero by turning the adjustment knob (K) fully counterclockwise.

3.Slowly turn the adjustment knob (K) clockwise to increase the air pressure to the cup.

4.Push the adjustment knob lock-ring (L) down to lock the cup pressure setting.

Setting the Gun Air Pressure

NOTE: Installing the gun air inlet regulator adds a pressure drop that could limit the air cap pressure.

Set the gun air pressure regulator for the minimum pressure needed to atomize your fluid. See your gun manual for recommended settings.

Spraying Tips

The regulator is not self relieving so if the regulated air pressure setting is causing excessive fluid flow, follow these steps.

1.Pull up the cup regulator adjustment knob lock-ring

(L). See Fig. 4.

2.Turn the adjustment knob (K) counterclockwise.

3.Trigger the gun into a grounded metal waste container until cup pressure is lowered.

4.Turn the adjustment knob (K) clockwise until you obtain the desired lower pressure setting.

5.Push down the adjustment knob lock-ring (L).

CAUTION

Do not restrict the fluid flow by continuously spraying with the gun’s fluid adjustment knob (M) turned in (clockwise) as this will cause excessive abrasive wear on the fluid needle and trigger/air valve shaft.

To restrict the fluid flow, lower the cup pressure or use a smaller size needle/nozzle set and air cap combina- tion.

If the cup pressure must be below 1.0 psi (0.07 bar) to achieve the desired fluid flow, a smaller needle/nozzle size is recommended.

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