Differential bearings
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=109106
Printed Date: 21 May 2025 at 4:03pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Differential bearings
Posted By: chris 21
Subject: Differential bearings
Date Posted: 17 Jul 2015 at 9:23am
| I am at a point to were i can replace differential carrier bearings. The problem is the bearings don't look bad and i don't know if i would be able to replace them and get everything back together properly, backlash, bearing preload, etc. Are there any videos out there of this being done? I have read the procdure in the the manual and i have a hard time understanding it. Any thoughts? |
Replies:
Posted By: TomMN
Date Posted: 17 Jul 2015 at 11:13am
Here you can see how the bearings are adjusted. The big threaded pieces can be used to tighten or loosen the bearings and can also move the ring gear closer or further away from the pinion. and the link to a couple more pictures. http://home.comcast.net/~old_allis/ac-RC-chassis.html" rel="nofollow - http://home.comcast.net/~old_allis/ac-RC-chassis.html |
Posted By: chris 21
Date Posted: 17 Jul 2015 at 11:40am
| Thanks for the pics. Are there torque specs. listed for this type of repair? My shop manual doesn't have any listed. |
Posted By: TomMN
Date Posted: 17 Jul 2015 at 11:47am
|
I don't remember any torque specs on this. |
Posted By: Brian Jasper co. Ia
Date Posted: 17 Jul 2015 at 4:38pm
|
I can't say for 100% on a tractor, but that diff is designed just like a Ford 9" with the threaded carrier bearing adjusters. There isn't a torque spec rather it's measuring the bearing preload rotational torque with a an inch pound torque wrench. I shoot for 15-20 inch pounds on the pinion then add another 10 inch pounds measured from the pinion nut with the carrier installed. With threaded adjusters I would strongly recommend you check tooth contact patch before you call it good. .005-.012 is typical backlash in an automotive axle. Now here's where it gets a little interesting. You're probably installing the original gears likely with a wear pattern on them. I was talking with Dr Allis on this and he says many times in the past he found that restoring bearing preload and correct center tooth contact patch made more noise than before. He did say that he would typically install them with more backlash than original. Sometimes it helped with noise but not always. Sometimes they can sound like they're grinding away and live a long happy life, other times not. The point I think he was try to get across was if I mess with my noisy rear gears, it's a lot of work and very possibly I might make the noise worse. ------------- "Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford |