[mkedzierski]

Originally Posted by J-Mech

I'll just give the short answer.

The BDU-10's overall efficiency, rated at 3000 RPM input, pump at full displacement caps out at about 180 lbf*in.

The U-15's overall efficiency, rated at 3300 RPM input, pump at full displacement caps out at about 500 lbf*in.

That is according to the Sauer Danfoss Series 70-15 pump book page 18 and 19. I have a PDF copy, but if you hunt around the internet, you'll find it.

Sauer Danfoss now owns Sundstrand and (did) help design the HG BDU pumps. I can't find anything that says that they still own HG.... and I'm not digging into it anymore.

By the way, if you would just look at the parts book for the BDU pump, you would see it only is a 5 piston pump/motor combo. The U-15 is a 9 piston pump/motor. Stands to reason it develops more torque without doing any math, or book searching.

Great, thanks for the input and time to research this.