Tiller leaking gear oil


Old 09-27-11, 08:20 PM
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Join Date: May 2008
Location: Pillager Minnesota
Posts: 67
Tiller leaking gear oil

I have a 2002 Troybuilt tiller model 21A-634F063 and is leaking gear oil at the drive shaft just behind the pulley. I looked at the schematic and dont see a seal, all I see is a bearing. I filled the housing full to overflow with gear oil is it possible to put too much gear oil in? Can anybody tell me what to do to stop the leak?
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Old 10-13-11, 06:19 AM
puey61's Avatar
Join Date: Apr 2004
Location: Upstate New York
Posts: 3,224
Purchase a Troy-Bilt (MTD) oil seal, part number 921-04030 from any local MTD service center. That is the correct, factory seal you need, per the IPL.
Old 10-13-11, 07:35 AM
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Location: NC, USA
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Yes, it is possible to put in too much oil especially if the case is not vented, which is common with dirty environments like tillers. The air space inside the housing allows the oil to expand & contract with changes in temperature. When filled to the rim and capped the expanding oil has no where to go and a shaft or bearing seal sometimes is the weak link.

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