Good morning Mr fiat41b, would you, or have you access to a spec sheet of the Allis-Chalmers HD41? I have a friend looking for a spec sheet with all its measurements, or do you know of anybody that would have one I could contact. I worked around the neat Allis-Chalmers HD41 back in 1980 for Cassidy-Varella in thousand oaks California they rented it, it cost the company back then $3.00 a minute to rent the only thing rong with Allis-Chalmers was no resale, I didn't get to run it but a buddy of mine did he was turning and didn't have the ripper up high enough and broke the shank off it was a 12" shank and of course we were in nasty rock. Can you do me any good. Mike Nebergall