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Model B Gemmer Steering Gearbox
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Ryan59 View Drop Down
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Joined: 30 May 2016
Location: Kansas
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan59 Quote  Post ReplyReply Direct Link To This Post Topic: Model B Gemmer Steering Gearbox
    Posted: 13 Jun 2016 at 5:37pm
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.

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Ryan59 View Drop Down
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Joined: 30 May 2016
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan59 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2016 at 5:40pm
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.

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Ryan59 View Drop Down
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Joined: 30 May 2016
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan59 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2016 at 5:41pm
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Ryan59 View Drop Down
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Joined: 30 May 2016
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan59 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2016 at 5:45pm
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.

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Ryan59 View Drop Down
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Joined: 30 May 2016
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan59 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2016 at 5:48pm
Placement of the bottom bearing assy is more critical than the floating top bearing race.

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Ryan59 View Drop Down
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Joined: 30 May 2016
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Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan59 Quote  Post ReplyReply Direct Link To This Post 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... 
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Ryan59 View Drop Down
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Joined: 30 May 2016
Location: Kansas
Points: 68 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan59 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 2016 at 6:03pm
Tap out the bottom race and install the other new race (both the same part number now).

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