Feederhouse chain tensioner cylinders leaking - The Combine Forum
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post #1 of 11 (permalink) Old 07-20-2019, 08:37 PM Thread Starter
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Feederhouse chain tensioner cylinders leaking

We pulled our 2014 740 out of the shed today to look over before wheat harvest. The feederhouse chain tensioners (little hydraulic cylinders) are leaking on both sides. They did not do that when we finished harvest last fall. It's a pretty good leak when the combine is on. Any ideas as to what would cause both cylinders to leak like that? It's unlikely that we'd blow out a seal on both of them coincidentally.

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post #2 of 11 (permalink) Old 07-20-2019, 10:09 PM
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Weird, but they do have a seal kit.
00 0045 929 0

Assuming you have the same cylinders my 2018 780 has.

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post #3 of 11 (permalink) Old 07-21-2019, 08:08 AM Thread Starter
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Thanks for the part # Don. We finished up last year when it was really cold (10-15 degrees) so maybe that had something to do with it.
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post #4 of 11 (permalink) Old 07-21-2019, 10:00 AM
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Youíre welcome.
Canít see why cold weather operation would cause them to leak, perhaps seal stiffness gave way, but still, weird.
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post #5 of 11 (permalink) Old 07-21-2019, 10:28 PM
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I have seen many hydraulic components seep when cold and "fix" themselves when operating within more "normal" conditions. I wouldn't expect those two cylinders to do anything more than be damp and collect dust. If there is a drip or stream, something is not right with them.
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post #6 of 11 (permalink) Old 07-23-2019, 03:59 AM
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little help..

I assisted Ran in this article.. hope it helps axleaddict.com/auto-repair/Hydraulic-System-Repairs-How-to-Rebuild-or-Repair-Hydraulic-Cylinders since I can't type entire process here
I usually take reference from reliable-store. com
Let me know if u need more info
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post #7 of 11 (permalink) Old Yesterday, 10:00 AM Thread Starter
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Well I know more about this now. I guess the cylinders leaking has been more of an issue in the southern areas. So much so the new model released now does not have the hydraulic tension on the feeder chain. Went back to mechanical.

Also there is no way a human being can repair the seals in those little cylinders. The seals are hard little buggers and you can't get a finger inside of the bore. Using a oring hook set you scar the hard little seals since they are very hard and not forgiving. You just have to buy new cylinders. About $500 each. Part # 0409000. The seal kit is about $150 but I'd like to know how a guy is supposed to do it.

Mine were leaking enough where I kind of doubted they would right themselves.
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post #8 of 11 (permalink) Old Yesterday, 11:24 AM
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Why not get the kit and let your dealer or hydraulic shop fix them.
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post #9 of 11 (permalink) Old Yesterday, 09:00 PM Thread Starter
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This is what we did. We got out our standard o ring kit with "normal" soft o rings. There are two o rings in the barrel to replace. We used two #112 3/32" round o rings, easy to get those in there. Put it all back together and doesn't leak. Wheat harvest starts next week not sure if it'll hold up in the heat of battle but haven't brought the new cylinders back to the store yet in case the o rings blow out again. Worth a shot to save $1000. But for anyone that goes through this I'd recommend not wasting any money on the $150 seal kit. Those o rings are impossible.
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post #10 of 11 (permalink) Old Yesterday, 10:28 PM
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I don't have those cylinders to look at in front of me, but I have heard many use very hot water to soften hydraulic o-rings to get them to install easier. Did you try or consider that?

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