Graco Inc 235459, 308235, 237691 How to Check the Gun Diffuser Operation, How to Flush the Gun

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Installation/Operation

How to Check the Gun Diffuser Operation

Check the diffuser operation weekly. The gun diffuser/ seat (2a) breaks up spray and reduces 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 7. 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.Follow the Pressure Relief Procedure, page 5.

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.Follow the Pressure Relief Procedure, page 5.

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.Follow the Pressure Relief Procedure, page 5.



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Contents Model 235-457, Series C Model 237-691, Series BModel 235-459, Series D Model 235-458, Series CTable of Contents SymbolsRecoil Hazard Injection HazardMoving Parts Hazard Fire and Explosion Hazard Toxic Fluid HazardInstallation/Operation Pressure Relief ProcedureHow to Use the Gun Trigger Safety System RequirementsHow to Use the Gun How to Adjust the Spray PatternHow to Clean the Spray Tip Clear a Spray Tip Obstruction Cleaning during the dayHow to Check the Gun Diffuser Operation How to Flush the GunService Needle Replacement38235 Parts Model 235-457, Series CPage Accessories FiltersSwivels and Whip Hoses ToolsTechnical Data Graco Phone NumberManual Change Summary Changed Model 237-691, Series C To Model 237-691, Series BGraco Warranty and Disclaimers Warranty