Loose 185 crankshaft pulley
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=182548
Printed Date: 22 Oct 2025 at 11:36pm
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Topic: Loose 185 crankshaft pulley
Posted By: AC/DC
Subject: Loose 185 crankshaft pulley
Date Posted: 15 Aug 2021 at 4:40pm
I threw a fan belt while sickle mowing the other day, went and got a new one, installed it and threw it again shortly after. Noticed crankshaft pulley was loose, finger tightened and headed back the 3/4 mile to home. Ever so often I would here a growl coming from somewhere.
Got it home and the fan was barely spinning until I heard that growl again, and saw fan started to work again. Called a friend who has way more experience with wrenching than I do, and he said he had a similar situation on one of his Olivers.
He lock tighted some ready rod in, and used nuts so he could still get the pulley off when needed. I am looking at the parts manual and see a gear and some woodruff keys and wonder if the ready rod fix will work for me. Any of you guys dealt with this before?
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Replies:
Posted By: DanWi
Date Posted: 15 Aug 2021 at 5:24pm
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Is the rubber failing between the inner and outer portion then you need to remove it and send it in and have it rebuilt.
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Posted By: DrAllis
Date Posted: 15 Aug 2021 at 5:53pm
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A 185 doesn't have a rubberized crankshaft pulley. It is sold cast iron. A crank pulley that has been loose is something I've NEVER seen on one of those engines in a farming application. The crankshaft snout is tapered and the crank pulley bolt is torqued very t-i-g-h-t and they never come loose. In fact, they come off hard !!! I'd be expecting the pulley at least to be junk and the key in the crankshaft as well. If the snout of the crank isn't hurt it will be a miracle. If you even think you're going to try and fix it, you need a new retaining bolt and the thick washer better be in good shape or new too. New half-moon key from AGCO. Lots of red Loctite on everything. Torque to 180 ft lbs. I'd find a different pulley so it is smooth and in proper taper shape.
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Posted By: DougG
Date Posted: 15 Aug 2021 at 6:17pm
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Geesh those are a bear to get off - and POP - when they do , something else has happened imo, to have it come loose
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Posted By: Lonn
Date Posted: 15 Aug 2021 at 6:44pm
Broken crank?
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-- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... -
Wink
I am a Russian Bot
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Posted By: SteveM C/IL
Date Posted: 15 Aug 2021 at 6:48pm
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The last guy who had it off didn't tighten it enough. They don't work loose when tightend properly. Be shocked if crank is not ruined.
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Posted By: Mikez
Date Posted: 15 Aug 2021 at 8:50pm
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take it off and post pictures for us to see
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Posted By: AC/DC
Date Posted: 18 Aug 2021 at 6:03am
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The pulley slid right off, not tight at all, shaft doesn't seem to be damaged. On my way to pick up another pulley this afternoon.Looking for AGCO dealer in my area, not having any luck. Probably have to look on line or give somebody a call.
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Posted By: DrAllis
Date Posted: 18 Aug 2021 at 6:10am
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What is the condition of the pulleys retaining bolt and washer ?? Is the bolt broken ?? What does the half-moon key look like on the nose of the crankshaft ?? What does the keyway slot look like inside the pulley ??
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Posted By: MACK
Date Posted: 18 Aug 2021 at 7:44am
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I dought it will ever stay tight again. Torque it to 180 ft lbs, remove bolt and check if washer hit end of crank or pulley. MACK
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Posted By: AC/DC
Date Posted: 30 Aug 2021 at 7:02pm
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When torquing to 180 lbs,is there an easier way to to stop the engine from turning over other than removing the starter and wedging a bar in there? Didn't think putting that much pressure would be good on the keyway by stopping the pulley.
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Posted By: DougG
Date Posted: 30 Aug 2021 at 7:09pm
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Pretty sure theres a hole in the Power Director housing to put a flat blade bar - really strong screw driver , lol, but this is the best place to stop all the enginge travel in the teeth of the flywheel,,
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Posted By: AC/DC
Date Posted: 31 Aug 2021 at 5:24am
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Thanks DougG, I'll take a look.
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Posted By: AC/DC
Date Posted: 04 Sep 2021 at 6:35am
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Just to update, I ended up ordering a stud, red loctited that in, found good used pulley, put it all on and then double nutted with blue loctite. I was able to get a 3 hours of mowing with the bush jog Weds, before rain Thurs. Hoping it will be dry enough to go out and test it some more today. Thank you to all who responded.
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Posted By: DrAllis
Date Posted: 04 Sep 2021 at 6:49am
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Why didn't you use the OEM grade 8 bolt and special flatwasher torqued to 180 ft lbs ??
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Posted By: AC/DC
Date Posted: 05 Sep 2021 at 9:10am
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I did use the flat washer, but I didn't use the bolt because I thought if I ever needed to take the pulley off it might be a problem with the use of red loctite.
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Posted By: DrAllis
Date Posted: 05 Sep 2021 at 7:28pm
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Well, I think that was a very bad idea. IF and only IF you ever needed to remove the pulley again, all it would have taken is an impact wrench on the bolt and the proper three-bolt puller to put heavy pressure on the pulley and then warm up the cast pulley hot with a torch. Your pulley is totally cast iron with no rubber on it and warming it up to loosen the Loctite would have been no problem. Good luck. The only reason to ever have had to remove it again would be to replace a leaking front crankshaft seal which, if it was leaking, torch heat would have made no difference, as you'd be replacing it anyway.
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Posted By: AC/DC
Date Posted: 06 Sep 2021 at 6:41am
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Well, you could be right. The experience I have wrenching isn't even a drop in the bucket compared to yours and I appreciate all the feed back. With the storms of 8/28 we've been busy with clean up, so I only have 3 hours on it since the fix. Planning on putting some more time with it today, and with our corn field flat, I'm thinking it should get some pretty good use this fall. I guess time will tell.
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Posted By: DrAllis
Date Posted: 06 Sep 2021 at 6:47am
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This is a very serious matter. First of all, those pulleys just don't fall off like yours did. Why did it ?? Secondly, you have one shot at maybe getting it to stay put and you choose not to use the correct bolt and torque it up properly??? Now when it falls off again a different crankshaft will be in order.
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Posted By: DanWi
Date Posted: 06 Sep 2021 at 2:33pm
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If he was able to torque the nut to the proper amount why was using a stud instead, a bad thing? My only thought as someone else had asked if the washer bottoms out on the front of the crank could he have used a machine washer that fits over the crank behind the proper washer to push the pulley a little tighter on the crank?
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