Quote:
Originally Posted by mkedzierski
I am looking for the torque specs, basically the overall "power" of the Sundstrand to compare it to a new cub with the BDU-10. What's confusing is a new cub has 22 to 25hp motor paired to the BDU-10 (compared to 10-14hp on older ones) so does this mean that the BDU-10 can actually handle 25hp (45 ft lbs torque estimate) and make it to the wheels? Not looking for opinions, but actual output data on the old sundstrand 15U.
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Quote:
Originally Posted by mkedzierski
Thanks for the input. Not planning on switching, just need to compare the output torque to the BDU-10
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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.