Pay attention as you dis assemble the unit, take pictures if necessary, and note the direction and location of each seal, and part you remove...
the attached pics should be some guide, as it's not documented anywhere how to disassemble.
After removing the external 'E'clip from the shaft, there is a 'pin' thru the shaft that must be removed during the assembly, and re-pressed back into the shaft.
examine the pics,
Sorry, this is all new, so any photos you take, can be used to help in the future...