Which preposition to use with separator

with Occurrences 2%

The fellow who backs his engine up to the separator with an open throttle and must reverse it to keep from running into and breaking something, is running his engine on his muscle and is entitled to small pay.

in Occurrences 1%

The other receivers came down quickly, and various homely household sounds mingled in her earsa sewing-machine's soft purring in one housea child's cry in anotherthe musical whine of a cream separator in a third.

of Occurrences 1%

Sickness and incapacity did not daunt them; but it was death the separator of whom they were all so much afraid.

Which preposition to use with  separator