Graco Inc 236-531, 308-236, 237-695 How to Check the Gun Diffuser Operation, How to Flush the Gun

Installation/Operation

How to Check the Gun Diffuser Operation

WARNING

The Fine±Finish Gun, Model 235±462, uses a pre±orifice in the seat to develop the type of spray pattern required for fine finishes. The pre-orifice does not diffuse the spray from the nozzle into an irregular pattern, as with the other guns covered in this manual. Therefore, to reduce the risk of an injection injury when the tip guard is not installed, such as during cleaning, take extra precautions to keep your hands and body away from the nozzle of the gun.

For all other guns, check the diffuser operation weekly. The gun diffuser/seat (2a) breaks up spray and re- duces the risk of fluid injection when the tip is not installed. Perform the test below. If it fails, replace the entire Needle Kit, Part No. 235±474, as instructed on page 9. Diffuser/seats are not sold separately since the gun will leak if an old needle is used with a new diffuser/seat.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 5.

1.Relieve the pressure.

2.Remove the tip guard and spray tip.

3.Start the sprayer and adjust it to the lowest pressure.

4.Aim the gun into a grounded metal pail while holding it firmly to the pail. Trigger the gun. If the fluid emitted is not diffused into an irregular stream, replace the entire needle kit immediately. See Fig. 5.

2a

Fig. 5

How to Flush the Gun

Always flush the pump and the gun before the fluid being sprayed can dry in it.

NOTE: If it is available, the flushing procedure provided in your pump or sprayer manual should be used instead of this procedure.

WARNING

FIRE AND EXPLOSION HAZARD

Static sparking and splashing may cause

fire, explosion and serious injury. To reduce static sparking and splashing,

always remove the spray tip from the gun, and hold a metal part of the gun firmly to the side of a grounded metal pail when flushing.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 5.

1.Relieve the pressure.

2.Remove the tip guard and spray tip. Soak and clean the parts.

3.Put the pump intake in a grounded pail of water or solvent.

4.Start the pump at its lowest pressure.

5.Trigger the gun into the original pail. When solvent appears, release the trigger.

6.Now trigger the gun into the solvent pail. Circulate the fluid until the system is thoroughly flushed.

7.Relieve the pressure.