I recently purchased the above snow-thrower and I am in need of some help with it. It dates from the late 70's and the picture I have on the manual that I downloaded shows it attached to a Groundsmaster 52. It has been converted to a 3 point hookup and I am looking to change that back to a front mount, but for a Kubota B7100, but that is another story. What I need to know is what speed the two stage impeller should run at. In the 3 point conversion that was made, there was some modification to the drive pulley setup, so I am not sure what speed it was running at. It could have been 540 rpm or some other speed(my Kubota has 3 selectable speeds). I have downloaded the parts catalog and operating instructions but these aren't helping me. Thanks for the input and thanks for the add to your forum.