click.) The other limit switch must click over when the cylinder rod is in the extended position. If this does
not happen on these switches, adjust the lever positioning by repositioning the lever on the shaft protruding
from the switch.
Remove padlock from the breakers and turn breakers on.
3-7-11 Air Cylinder
Repair and Re-assembly. See figure 3-47.
Remove the air cylinder from the installation. Disconnect air hose lines and cap hose ports to prevent
contamination from entering the system.
Clean the external parts of the cylinder.
Remove the clevis (and jam nut if there is one) from the piston rod. Use a wrench on the piston rod flat so
that the rod is not damaged.
Remove the four nuts on the tie rods at the rod end of the cylinder.
Slide the head assembly off the piston rod.
The piston rod and piston can be removed from the cylinder.
(Review the complete procedure before continuing.) Using a small screw driver, remove all seals in the
head and on the piston.
Replace all seals in the cylinder if they are available. If not, inspect the seals prior to removal. Replace
seals with cuts, breaks or that are worn.
Thoroughly clean all the components. Use care not to damage or scratch any finished or polished surface.
Carefully clean all cavities and grooves.
Inspect the piston rod for damage or wear. Replace it is believed a good seal cannot be obtained after
Inspect the inside of the cylinder barrel for scars, wear or rust. thoroughly clean. It should not be necessary
to replace the cylinder barrel unless there has been contamination in the system. If the barrel is damaged
internally, replace if necessary and check the complete pneumatic system for causes of the contamination.