Prior to any motor disassembly, plug the open ports and clean all dirt from the outside of the motor.
Disassembly Of Cover Section Of Motor
Remove the key from the shaft if there is a key.
Mount the motor in a vise or other holding device with the shaft facing down.
Remove the eight 5/16-24 bolts and seal washers.
Remove the cover/bearing assembly and the square ring seal.
Remove the IGR set components starting with the outer locating ring and rollers. Note that the innermost IGR element and rotary valve are retained on the shaft by the snap ring. Do not remove this snap ring.
Remove the two check valve balls. Note that the check balls frequently fall into the body tapped holes or into the body valve ports during disassembly. Be sure that the check balls are removed.
Remove the shaft, IGR inner element, and the rotary valve as one assembly.
With the shaft assembly removed from the body, inspect the IGR inner element, the rotary valve, and the shaft for wear or other damage. The shaft should have smooth polished surfaces in the bearing and seal areas. If any of these components are damaged, the snap ring must be removed and the appropriate components replaced. If the snap ring is removed, discard the snap ring.
Remove the square ring seal from the body groove.
Shaft Seal Replacement
If the motor body shaft seal (or cover shaft seal if a thru shaft model) has shown signs of leakage during operation, the quad ring seal and back-up ring must be replaced with the motor completely disassembled.
The quad ring seal and the back-up ring can be removed using a dull pointed object such as a pencil point or the end of a paperclip. Do not use a sharp object such as a knife because the sealing surface in the body or cover can be damaged.
With the old quad ring seal and back up ring removed, install a new back-up ring first and push it against the sealing surface toward the outside of the motor. The back-up ring can be seated with a dull object.
Next install a new quad ring seal on the inboard side of the back-up ring and push it against the back-up ring.
Lubricate the inside diameter of the quad ring and back-up ring with oil or vaseline.