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JD 430 Loader - Blown Lift Cylinders again

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N_Idaho
Join Date: Jul 2008
Posts: 5 Sandpoint, ID
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-07-27          155639


Hi all,

I've blown the seals on one of the lift cylinders three times now. I've had them rebuilt with new seals by the local JD dealer but now they are telling me I need new cylinders at a cost of $480 each.

1. What makes the cylinders go bad like this? I have about 400 hours on the tractor and I use the loader all of the time. Surely this isn't consider normal maintenance?

2. Should I take the cylinders to a professional hydrualic shop for a third try at fixing them up?

3. Is there a source of third-party cylinders that would work on my JD? The green paint they use seems to make everything so much more expensive than it needs to be.

TIA
Peter :-)

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____________________________________________________________________________________
JD 430 Loader - Blown Lift Cylinders again

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kwschumm
Join Date: Feb 2003
Posts: 5764 NW Oregon
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2008-07-27          155640


Not normal. If your tractors hydraulic pressure is within spec there's likely something wrong with that cylinder that JD hasn't discovered. Something in it is bent, nicked, or out of spec. I'd have it rebuilt one more time by a hydraulics shop and tell them that your dealer can't find the problem. ....

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JD 430 Loader - Blown Lift Cylinders again

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harvey
Join Date: Sep 2000
Posts: 1539 Moravia, NY
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2008-07-27          155643


Take it to a hydraulic shop. Rod bent or scored. If not wrong type seal, seal damaged during install. Hyd shop will know. If cylinder bad that can match it to new with black paint for half. ....

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JD 430 Loader - Blown Lift Cylinders again

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earthwrks
Join Date: Dec 2003
Posts: 3853 Home Office in Flat Rock, Michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2008-07-30          155717


Maybe I missed it but are you talking about the seals in the gland where the rod goes through or is it the seals at the piston inside? There is also another seal sandwiched bewteen the piston rod end where it goes into the piston. I have a feeling that there is a burr on the piston end of the rod. In order to replace the gland seals they have to remove the piston then slide the rod out and replace the seals in the gland. Once all is in place the rod gets forced through the gland with its new seals and this is where I think the problem is. Something on the end of the rod is either cutting splitting or rolling the seals inside the gland.

This is an easy job to replace all the seals. The first time may take an hour. The second time will take 20 minutes to a half hour. Any longer than that---you shouldn't be behind the wheel of a machine! LOL
Parts shouldn't cost more than $25-50. ....

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____________________________________________________________________________________
JD 430 Loader - Blown Lift Cylinders again

View my Photos
N_Idaho
Join Date: Jul 2008
Posts: 5 Sandpoint, ID
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-07-30          155718


Thanks for the reply. I am taking the offending cylinder into a local hydraulics shop tomorrow and I'll ask about this. The shop has a great reputation and won't try to sell me new John Deere parts... :-) ....

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____________________________________________________________________________________
JD 430 Loader - Blown Lift Cylinders again

View my Photos
earthwrks
Join Date: Dec 2003
Posts: 3853 Home Office in Flat Rock, Michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2008-08-04          155795


Are you either by accident or intentionally extending the cylinders until they bottom- (really top-) out or stop? If yes, that could be the issue.

Just for anyone else reading this, if the cylinders are over-extended, you run the risk of pounding out the gland that hold the piston rod inside the cylinders; and if the rod and cylinder alignment are not perfectly aligned through the centerline of the unit, AND/OR the pivot pin(s) have a slight resistance to rotation THAT will cause the rod to bow and catastrophically fail. ....

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____________________________________________________________________________________
JD 430 Loader - Blown Lift Cylinders again

View my Photos
N_Idaho
Join Date: Jul 2008
Posts: 5 Sandpoint, ID
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-08-05          155816


Just to wrap this up with a happy ending. I took both of the main lift cylinders to a local machine shop that specializes in hydraulics. Both cylinders were disassembled, cleaned, checked and reassembled using a new set of JD seals/gaskets for the cost of only $125 for labor. My dealer charged $100 for do just rebuild one and they didn't do a very good job. Bottom line, I'm back with a loader that works very well. My next task is to change out all of the hydraulics just to make sure I don't have any other problems.

Thanks
Peter ....

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____________________________________________________________________________________
JD 430 Loader - Blown Lift Cylinders again

View my Photos
kwschumm
Join Date: Feb 2003
Posts: 5764 NW Oregon
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2008-08-05          155818


Did they say if they found anything unusual with the cylinders? Burrs or nicks or bends or anything? ....

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____________________________________________________________________________________
JD 430 Loader - Blown Lift Cylinders again

View my Photos
N_Idaho
Join Date: Jul 2008
Posts: 5 Sandpoint, ID
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2008-08-08          155952


Unfortunately, I didn't get to talk with the person that actually did the work. But he didn't note anything on the record. I think if he had, I'd have heard about it because they have that good of a reputation.

I think the last guy just didn't rebuild the cylinder properly. As for the original failure? It could be I overloaded the loader. I recall trying to dig into a pile of frozen dirt early this Spring when the loader suddenly started to drop on its own. Lesson learned. :-)

Pete ....

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