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Gearcutter I went back and re-read the other thread you recommended. (http://www.eng-tips.com/viewthread.cfm?qid=318697) "Angular misalignment generates a small oscillatory movement, between mating spline teeth, which traces the path of a figure of 8." I can see how that would happen...

mfgenggear, Thanks, it was that thread that lead me to join & post. Our company has a quite a few PTO driven pumps in similar application to his, so we've been down that road. The solutions were similar to what was posted, although the posts weren't as clear or definitive as they might be...

Metalhead97, Thanks for the reponse. It is the male splined shaft going into the pump. It is a Parker P2 axial piston pump plugged into a pump drive which does NOT allow much slop, the pilot of the pump is a tight fit in the matching pilot diameter of the pump drive and it is held solidly...

Here is a link to a site I've found helpful to get various steel compositions. http://www.metalravne.com/selector/html/aisi.html

I just joined after reading a recent thread - Splined Shaft Wear (thread 330-318697). I'll apologize in advance as I"ll likely miss nuances of posting etiquette. I have been dealing with a significant wear problem on the splines driving some hydraulic pumps on a large piece of equipment...