350C engine flywheel isolator failure

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jeepglenn
40C crawler
40C crawler
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Joined: Tue May 24, 2011 7:19 pm
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350C engine flywheel isolator failure

Post by jeepglenn » Thu Feb 19, 2015 7:33 pm

Hello, I have a 1980 350C and the isolator plate has broken springs twice in 700 hrs. Does anyone have any suggestions as to what would be causing these failures? I have the engine out now and it appears that one of the anchor bolts came loose and stripped the rest. The plate looks OK so I should be able to get buy with just new springs and bolts.

The part numbers:

Isolator pn AT29086
Spring pn T29675
Retainer pn T55320

Any advise will help, thanks.
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JD 350C
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Lavoy
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Post by Lavoy » Fri Feb 20, 2015 10:35 am

All of those parts are Deere only. I am working on a kit to convert to later style isolator which will eliminate the problem, but that is the best I can tell you.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

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Tigerhaze
350 crawler
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Post by Tigerhaze » Fri Feb 20, 2015 1:39 pm

I don't have direct experience with the spring isolators, but the others that have spoken on here about them say it is critical that the springs and tabs are installed with a threadlocker sealant or they can come loose and cause havoc similar to what you described.
(1) JD Straight 450 crawler dozer with manual outside blade; (2) JD 2010 diesel crawler loaders; (1) JD 2010 diesel dozer with hydraulic 6-way blade; (2) Model 50 backhoe attachments, misc. other construction equipment

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NWJD fan
440 crawler
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350C isolator

Post by NWJD fan » Fri Feb 20, 2015 6:54 pm

As Tigerhaze says installation details are critical. I think Jdemaris gave the comprehensive list of installation procedures on yesterdays tractors. If you are a little bit adventurous there was a fairly recent post on 350C isolators here that detailed using a 100+HP rated clutch disc bolted onto the flywheel as an alternate to the 350C isolator.

cantbeatadeere
440 crawler
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Location: new york..upstate..

Post by cantbeatadeere » Fri Feb 20, 2015 7:48 pm

Can you post a picture of how you had it assembled, or just describe it. Assembly is very important, cleaning/prepping the threads and Loctite them along with proper spring installation and bolt torque pays off. if you have a minute look at the pics I posted a couple threads down. I have my stock flywheel, springs, isolator and anchors assembled under the bench, if you need I can post a picture of how it should be assembled if that will help you.

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