Today I retrieved my ZF from a small local firm. I'm not aware of anyone having done this previously, but I had the ZF cleaned using dry ice blasting. As it uses a fairly low pressure and shaved or pelletized dry ice, there is no grit to sneak into and damage the ZF. One major application is the cleaning, in place, of food processing and packaging business equipment.
Thus, no need to disassemble down to a bare ZF case as is often the case.
Before.... fairly clean but with a deep-in-the-pores oily finish that resists actually getting any cleaner.
Larry
Original Post