LXi and WideBody PTO/Pump Splines

[davidbrady]

(04-30-2013 16:52)Arcticdude Wrote:  It looks like the 1" shaft is only .834, whereas the 7/8" shaft is .724. That would certainly explain why there's not much improvement in moving to the 1" shaft. Too bad it's not truly 1.000". Why do the OTR guys not see issues with theirs?

Ahh, but it's more than just an increase in root diameter, it's also an increase in tooth count and an increase in effective width of the engaged tooth.

Going to 1" decreases the stresses on the steel by 35% and puts us well below the spline's allowable design stress limits. The improvement is well worth the effort. The spreadsheet only requires a safety margin greater than zero which we achieve with the 1" shaft but don't with the 7/8", and there's zero price increase relative to the 7/8" splined PTO and Pump.

We're very fortunate that both Chelsea and QCC provide parts that allow us to achieve design strength and to do it within the space constraints we have.