Installation of the Jack-Screw
Before removing the upper mechanical seal (300A) and bearings (218,219) the rotor must
be supported by a jack-screw installed in the bottom bearing housing cap (402). A jackscrew
can be easily made by using a piece of 3/4"-10 UNC all-thread rod, or a stud, and a
couple of hex nuts. The jack-screw should be approximately 6" long and free of dirt, grit, or
anything else that may contaminate the grease in the lower bearing.
Remove the plug (406) and gasket (405) located in the lower bearing housing cap (402).
With the top bearing cap (202) removed, insert the jack-screw in the lower bearing housing
cap (402) and raise the rotor (500) approximately 1/8". This will remove the axial load on
the split ring (209) due to the rotor's weight and allow the disassembly of the bearing. On
small units a spiral wound retainer clip (209) is used in place of a split ring.