Tom,
   I couldn't remember where I had read the turque spec. so I just went back through my books to be sure my recall was at least close. The torque spec for my tractor is 20- 25 ft. lbs. 
   I went to put the pump back in the 2655 Oliver and I just could not get it to seat and figured I must be doing something wrong....so I called a fella I know out in Wisconsin and he said there is an air gap between the pump and the crankcase and the little wing you broke off does not seat. It seems like such a poor design, but obviously it works!
  Hope I've helped some.
                Cal