Driveshaft pilot bearing

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sdurnal
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Tractors Owned: 105 & 127 cadet (sacrificed for a 4wd project)

680 Cadet
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Location: IN, Columbus

Driveshaft pilot bearing

Postby sdurnal » Thu Apr 06, 2017 7:59 am

I've replaced the front pilot bearing in my 680 Hydro about 4 times now, and it's worn out again. Is anyone aware of an aftermarket "fix" to eliminate the wear and subsequent vibration once & for all? (it's the one which attaches to the flywheel cup, and front flex coupler) Thanks.. P.S. I replaced the motor mounts, as well as the old thumper K301 engine with a K321 counterbalanced version less than a year ago. The bronze ball gets loose in the drive flange, then the shaft goes into orbit. (it should be sealed in my opinion) Any ideas?

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gitractorman
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1951 Farmall Cub
1977 IH Cub
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Re: Driveshaft pilot bearing

Postby gitractorman » Thu Apr 06, 2017 9:20 pm

I would check the alignment of your engine. Take the driveshaft loose at the hydro pump, install a new bushing at the engine, then hold the driveshaft in the engine and see how it lines up with the hydro pump. I'll bet that you'll find that it wants to direct itself to one side more than the other, meaning the engine is not aligned properly. I've seen this happen many times, especially when the engine has been pulled out. It's easy to just bolt the engine back in place and think it's all lined up. If the engine is aligned properly, that bushing will almost never wear out.
Cub Cadets 682, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller

User avatar
sdurnal
5+ Years
5+ Years
Posts: 870
Joined: Thu May 06, 2010 1:36 pm
Zip Code: 47201
Tractors Owned: 105 & 127 cadet (sacrificed for a 4wd project)

680 Cadet
1964 LoBoy FH
L-54A Blade
Pennington 3 spindle deck
LF-194 plow
Circle of Safety: Y
Location: IN, Columbus

Re: Driveshaft pilot bearing

Postby sdurnal » Fri Apr 07, 2017 7:01 am

Will give it a look-see. I'll have it out anyhow. Thanks.


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