Model B Gemmer Steering Gearbox
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Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=124539
Printed Date: 24 Nov 2024 at 2:09pm
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Topic: Model B Gemmer Steering Gearbox
Posted By: Ryan59
Subject: Model B Gemmer Steering Gearbox
Date Posted: 13 Jun 2016 at 5:37pm
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Wish there was a mechanical section to post engine/transmission/steering repair-modification-rebuild articles, discussion etc. without being mixed in with finished tractors after-the-fact. A before-the-fact build. Maybe call it The Workshop? The tapered roller bearings were bad in the Gemmer steering gearbox of my Model B. This is what I did to rebuild it with available bearings. A note first: The cones on the end of the worm gear are part of the worm gear itself. I avoided pressing the worm gear off as I felt it would loosen the press fit and it could possibly slip on the steering shaft. Just an FYI. Here are the new and old bearing cones/races. http://s150.photobucket.com/user/rw68560/media/DSC_0020_1.jpg.html" rel="nofollow">  " border=""> |
Replies:
Posted By: Ryan59
Date Posted: 13 Jun 2016 at 5:40pm
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I retained the upper tapered bearing race by chucking it up in a small late the turning the old race inside diameter to fit one of the new races that I bought. http://s150.photobucket.com/user/rw68560/media/DSC_0021_1.jpg.html" rel="nofollow">  " border=""> |
Posted By: Ryan59
Date Posted: 13 Jun 2016 at 5:41pm
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Posted By: Ryan59
Date Posted: 13 Jun 2016 at 5:45pm
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Next I chucked up the steering shaft and turned off the old damaged cone sections of the worm gear, both ends the same. I measured everything prior to starting this job as it is important that the worm gear be exactly centered (up and down) in the gearbox as it was prior to doing this modification. http://s150.photobucket.com/user/rw68560/media/DSC_0024.jpg.html" rel="nofollow">  " border="">
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Posted By: Ryan59
Date Posted: 13 Jun 2016 at 5:48pm
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Placement of the bottom bearing assy is more critical than the floating top bearing race. http://s150.photobucket.com/user/rw68560/media/DSC_0028.jpg.html" rel="nofollow">  " border=""> |
Posted By: Ryan59
Date Posted: 13 Jun 2016 at 5:55pm
| That is basically all there is to changing out the bearings. I had some 1500 grit clover compound that I applied to the worm gear teeth then assembled and adjusted everything as I would doing a final assy. Then worked the steering shaft back & forth for several minutes to "wear" in the new teeth contact area. The worm gear teeth on mine were pretty dinged up from years of rebuilds from hammer mechanics. I actually had to do this wearing in with clover compound a few times to work out the rough spots where the dings were. I sped up the process with a Dremel... |
Posted By: Ryan59
Date Posted: 13 Jun 2016 at 6:03pm
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Tap out the bottom race and install the other new race (both the same part number now). http://s150.photobucket.com/user/rw68560/media/DSC_0032.jpg.html" rel="nofollow">  " border=""> |