Farm Equipment - Removing B/C/CA bull gear shafts "gently"

Print Page | Close Window

Removing B/C/CA bull gear shafts "gently"

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=187744
Printed Date: 23 Aug 2025 at 9:05am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Removing B/C/CA bull gear shafts "gently"

Posted By: KMAG
Subject: Removing B/C/CA bull gear shafts "gently"
Date Posted: 18 Apr 2022 at 11:41am

Gentle way to remove final bull gear shaft.

Steps:
1. Remove final drive oil pan and drain oil.
2. Loosen 2" nut on bull gear shaftt next to bull gear.
3. Pop cover off final drive opposite end of wheel to expose bull gear drive shaft retainong bolt.
4. Remove 5/8" retaining bolt and washers.
5. No punches/hammers to knock out bull gear!!
6. Put steel spacers between big nut against bull gear and inner final drive casting. While holding nut, spin shaft counter clockwise to back off nut and have nut press steel shims against inner back wall of final drive. I left the wheel center on shaft to better spin shaft to tighten nut.
7. When nut gets too tight to rotate wheel center/ center not attached, use ply bar on bull gear to rotate it and shaft to loosen nut.
8.As nut loosens, it will press bull gear shaft out of housing. Increase thickness of steel spacers as shaft presses out.
9. Shaft pops out when bull gear slides off.

Note:only move shaft 3/8" at a time b/c you want full thread engagement on nut during press operations.

Replies:

Posted By: steve(ill)
Date Posted: 18 Apr 2022 at 1:16pm

Never done it that way, but should work fine... Like you said, just dont screw the BIG NUT too far off the shaft and not have enough thread engagement !!

Did you "MAKE" a wrench to fit the nut, or got something else ? I made one 20 years ago.. worked OK... not great.

-------------
Like them all, but love the "B"s.

Posted By: KMAG
Date Posted: 18 Apr 2022 at 3:21pm

1st Outer nut- big pipe wrench with 36" pipe extension. 2nd was much easier to remove heating it with a torch. No ext needed.

Inner nuts - very easy to loosen with a punch. I'd estimate torque was under 50lbs to break free.

I used a channel lock to hold inner nuts when pressing out shafts. Once the nut snugged up contacting the spacers, there was less and less force needed to keep nut from turning with the shaft as it was pressed out.