Figure 14-37.—Cleaning pressure-feed spray gun.not clean the small holes in the air cap, remove theTo clean a pressure-feed gun, you should back offpaint material and use a toothpick or broomstraw tothe fluid needle adjusting screw. Then, release theclean the holes. Do not use wire or other metalpressure from the pressure tank with the relief orobjects. They may cause permanent damage to the airsafety valve. Hold a cloth over the air cap and operatecap.the gun trigger. The cloth forces the spray materialFigure 14-38.—Spray gun lubrication points.back into the pressure tank (fig. 14-37). Remove thefluid hose from the gun and the pressure tank. Attacha hose cleaner to the hose and run thinner or suitablesolvent through it.Clean the air cap by using thesame method as the suction gun air cap.NOTE: Do not immerse an entire spray gunin cleaning materials, such as cleaningsolvents and thinners. These materialsdissolve the oil from leather packings andcause the gun to have an unsteady spray.The gun, fluid needle packing, air valve stem, andtrigger bearing screw require frequent lubrication.You should remove the fluid needle packing beforeusing the gun and soften it with oil. The fluid needlespring should be coated with grease according to themanufacturer’s instructions. See figure 14-38.14-41
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