Posted by TJ in KY on November 07, 2013 at 18:21:39 from (74.140.33.63):
Well I finally got the AC 175 back together. this is what I decided to do after getting ideas from here and the Allis Chalmers Forum.
My hub that bolts to front engine pulley was in good shape so I had it bored out and keyed and a set screw added over the key. Then I had a new shaft turned up to match the hub on one end and 1” on the pump end and bought a new chain coupling. I had to have the one for the pump rekeyed to ¼"
What I found when I installed the new parts was surprising (pictures attached) the shaft was out of line with the pump by at least ⅛ “. with the rubber bushings it could be pulled over to line up but that put a strain on the hub/crankshaft pulley.
I ended up pulling the pump so i could elongate the holes to make it line up better. I ended up putting shims under the right side to get the flanges to run closer to parallel. I checked that by sliding them together and checked for gap with feeler gauge.
I forgot to take pictures of final alignment but it was very close. I started it up without the coupling being connected and it ran very true.
I think the strain of misalignment may have caused the hub and shaft to be worn.
I have a total of about $350 in the repair. I found a machine shop in Tennessee that would make hub and shaft up similar to what I did, but I would have had to find the rubber bushings.That cost would have been $500 plus finding the rubber bushings. Mine were in good shape so I went this way. If I someone can tell me how to post the video I will. It is only 7 seconds long.
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