Posted 5/17/2015 05:17 (#4574799 - in reply to #4574738) Subject: RE: 7000 Allis Chalmers hydraulic pump
West Central Iowa
You could try a quad ring the same size as the o-ring. The quad ring will seal in the corners and not the middle like an o-ring. If that don't work, do like Dr. Allis says and buy a new pump cover. The new cover will have a threaded o-ring type plugs.