Since the gear reducer is working with load, attention shall be paid to the temperature increase of axial cone bearing and sliding thrust bearing oil sump.

When the early expansion cone is used to expand solid expandable tubular, the great axial force will be needed and the length of the tube will be reduced considerably.

The structure of impeller made by special material a hollow cylinder and installed in spindle assembly with cone at the top of the head, axial and key connection from, high-speed transfer button.