Figure 14-37.Cleaning pressure-feed spray gun.
not clean the small holes in the air cap, remove the
To clean a pressure-feed gun, you should back off
paint material and use a toothpick or broomstraw to
the fluid needle adjusting screw. Then, release the
clean the holes. Do not use wire or other metal
pressure from the pressure tank with the relief or
objects. They may cause permanent damage to the air
safety valve. Hold a cloth over the air cap and operate
the gun trigger. The cloth forces the spray material
Figure 14-38.Spray gun lubrication points.
back into the pressure tank (fig. 14-37). Remove the
fluid hose from the gun and the pressure tank. Attach
a hose cleaner to the hose and run thinner or suitable
solvent through it.
Clean the air cap by using the
same method as the suction gun air cap.
NOTE: Do not immerse an entire spray gun
in cleaning materials, such as cleaning
solvents and thinners. These materials
dissolve the oil from leather packings and
cause the gun to have an unsteady spray.
The gun, fluid needle packing, air valve stem, and
trigger bearing screw require frequent lubrication.
You should remove the fluid needle packing before
using the gun and soften it with oil. The fluid needle
spring should be coated with grease according to the
manufacturers instructions. See figure 14-38.