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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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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