B with a knock?
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=4265
Printed Date: 15 Jan 2025 at 8:11pm
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Topic: B with a knock?
Posted By: Murph-NC
Subject: B with a knock?
Date Posted: 26 Nov 2009 at 3:43pm
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While running, but not moving, by '50 B has a noticeable knock or thump about every second or so... at about 1/4 throttle. I can't really hear it, but I can feel it thru my feet. I guess it's there when it's moving too, but I don't notice it as easily. Any ideas?
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Replies:
Posted By: Joe/NC
Date Posted: 26 Nov 2009 at 4:57pm
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Throw out bearing would be my 1st guess, try greasing it and see if it changes the amount of knock or thump.
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Posted By: Cal
Date Posted: 26 Nov 2009 at 9:01pm
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A loose front pulley wil feel like that also, loosen belt to check it. Cal in Ct.
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Posted By: Murph-NC
Date Posted: 26 Nov 2009 at 9:24pm
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Thanks guys. I'll check both. Joe, I'll show I'm a rookie and ask how to grease the throw out bearing. I'm sure I could find it in my manuals, but I'll ask here first. Thanks again.
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Posted By: bruce
Date Posted: 27 Nov 2009 at 5:54pm
I had a friend with similar problem. sounded like it could be in trans, rear end or pto. we pulled it apart & found out that the u joint in the drive shaft was siezed up. put in different drive shaft from his parts & problem was solved.
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UC WC'S W PATROL B'S C'S IB CA'S WD'S WD45'S WD45D M CRAWLER G B-10 B110 B112 HBII2 HB212 712H 712S 314 GOLF CART TERRA TIGER
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Posted By: CTuckerNWIL
Date Posted: 27 Nov 2009 at 6:54pm
Murph, There is a hole in the bottom of the torque tube with a snap in cover. Pull the cover and you will be able to see the TO bearing. Some newer bearings are not greaseable. You'll just have to look.
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Posted By: Murph-NC
Date Posted: 03 Dec 2009 at 6:37pm
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I greased the bearing today and the knock stopped! Thanks for the help guys. I also removed the cultivator frame, so now my next project is a step. I'm tall, but that's still a long first step.
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Posted By: GregLawlerMinn
Date Posted: 04 Dec 2009 at 1:40pm
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Murph
If the noise went away after greasing the TO bearing; you may want to schedule a splitting and replacing the TO bearing in the near future. Have seen several were a loose TO bearing ate up the collar it rides on (and a few that it wore out the fingers on the pressure plate). Then you have an expensive fix.
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Posted By: Murph-NC
Date Posted: 04 Dec 2009 at 3:06pm
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Thanks Greg! That's good to know.
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