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D2 starter bendix and gear

D2 starter bendix and gear

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Ccafer
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Location: Rochester. NY
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I pulled the D2 starter today. The condition of the bendix is self-explanatory. Cat part number is 9B8901, which crosses over to a Delco 1868804. Looks like they are available on eBay. Unfortunately, it looks like the driven gear took a beating as well. Cat part number 7F8667. If anyone knows of a source or has one in good condition that they are willing to part with it

I would appreciate a reply. Thanks. Chris

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Wed, Feb 4, 2026 7:10 PM
Ccafer
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ps. I tried to attach images of the bendix and gear but don't see them.

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Wed, Feb 4, 2026 7:21 PM
Ccafer
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Wed, Feb 4, 2026 7:33 PM
Ccafer
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Wed, Feb 4, 2026 7:33 PM
GrantJ
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That almost looks like it was mounted too far out. Was there a spacer between the starter and the bell housing? Is that the correct nose cone? Much of either of those gears seems untouched. That does not look like wear and tear, it looks like some sort of improper mounting Good Luck. Grant.

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Wed, Feb 4, 2026 9:23 PM
GrantJ
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Just another thought, is that a late model D2 with the starter hole already in the bell housing or was it drilled by an owner or shop later?

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Wed, Feb 4, 2026 9:25 PM
Ccafer
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Grant. I probably should have clarified. This is off the pony not the diesel flywheel. I can assume someone was in there previously since the large bolt with the pointed and was not tight at all. Its a good point you bring but I think it was installed "properly" since all mounting bolts were tightened down. Im at a loss as to how so much material was removed from both the bendix and the gear.

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Wed, Feb 4, 2026 11:43 PM
edb
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C:\fakepath\D2 D4 Pony Electric Starter Motor.jpg
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Thu, Feb 5, 2026 12:28 AM
ctsnowfighter
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Is there any chance one could pull those those apart and reverse them? Put the "new" sides to each other? Just a thought. -- cts

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Thu, Feb 5, 2026 12:37 AM
edb
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What went wrong posting images here---also text had gone--sick of wasting time writing stuff and having to do it again--Bah-Humbug. If I insert the image it loads twice-I am confused here.

The scan attached should show which side of tooth end of pinion needs to be re-chamfered also you can work out from there which side of the idler gear teeth need to be reshaped too.

Wear like this can be caused by trying to re-engage the starter before the pony has come to complete stop, the Bendix screw dry and dragging not allowing full travel to engaged position, worn thrust washer at brush end of starter causing the pinion to be short of travel.

Cheers,

Eddie B.

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Thu, Feb 5, 2026 12:41 AM
Ccafer
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Thanks CTS and Eddie, for the idea of reversing the gear and re-chamfering. It'll be a little while (I'm in the great white north of Western NY right now and the machine is not where I live) for me to get the assembly out of the tractor. From nosing around, I see that I have the 3-bolt early style, which requires pressing the gear off of the shaft. If there's enough tooth left, going that route might just work. I also agree with the theories on the bendix. It was dry as a bone and lazy to return to the "home position" while sitting on my bench. As far as the bendix I will replace that with a new unit. Thanks. Chris

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Thu, Feb 5, 2026 3:31 AM
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