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NAA Hydraulic Cylinder Gasket Blows

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12-27-2012 08:15:25

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NAA has a gasket between the lift cylinder and the lift cover. I keep blowing out this gasket (#16 in attached picture) usually after some heavy use like plowing. Does this happen because the safety relief valve (#21) on the hydraulic cylinder is not functioning properly? I have blown this gasket four times in two years.

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01-03-2013 11:18:29

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 Re: NAA Hydraulic Cylinder Gasket Blows in reply to cac63, 12-27-2012 08:15:25  
I rebuilt my hydraulics one summer for a blown piston seal ring. I replaced all the gaskets in there thinking it would be a good idea. Worked good for a while then I blew out the gasket like you did the next spring while disking. I think the bouncing weight on the three point over rough ground is tough on the hydraulics.
I pulled it all apart again and found that the studs were loose. I had put the nuts on tight but the studs in the houseing were loose. Fluid pressure then blew out the gasket.
I removed the studs, tapped out the holes till they were good and clean, degreased everything, and then re-installed a new gasket using Permatex gasket sealer (#1 I think, the real sticky stuff in the can.) I then used new studs and torqued and loctited them into the housing. I then used new nuts and torqued them down to the max torque specified for the stud size. I have not had a problem in several years now. Also, make sure mounting surfaces are spotless and de-greased before re-assembly.
Good luck, not a hard job but frustrating when you have to do it repeatedly.
This post was edited by GLC at 11:19:33 01/03/13.

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12-27-2012 14:32:19

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 Re: NAA Hydraulic Cylinder Gasket Blows in reply to cac63, 12-27-2012 08:15:25  
It may not be your problem here, but a common reason these guys blow out is that people forget to install the two "donut" spacers (#15 in the parts diagram, usually included in gasket kits). Without those in place, the surfaces on either side of the gasket don't sit totally parallel when torqued down and eventually the gasket springs a leak under pressure.

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Daniel Robertson

12-27-2012 10:18:23

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 Re: NAA Hydraulic Cylinder Gasket Blows in reply to cac63, 12-27-2012 08:15:25  

Mine was blown out here when I purchased the tractor.
Dan R

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12-27-2012 09:17:45

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 Re: NAA Hydraulic Cylinder Gasket Blows in reply to cac63, 12-27-2012 08:15:25  
I'll take an educated guess at this since I can not be 100% sure on something like this. #1 do you any gasket goo?? If you do you should not be. #2 yes the relief valve maybe going bad. #3 you maybe over loading the system depending on what and how your doing things. #4 is the two parts 100% flat because if either is bent or warped it will blow a gasket like yours is doing. #5 do you torque the hold down bolt/nuts even and to spec if it has spec that is

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12-27-2012 08:53:39

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 Re: NAA Hydraulic Cylinder Gasket Blows in reply to cac63, 12-27-2012 08:15:25  
Which of the three holes in gasket is blowing out?

The two round holes are cylinder pressure.

The bathtub hole is pump pressure, which will be cylinder pressure during lifting, backpressure valve pressure during hold & lower, and will have upper limit set by overpressure relief valve located in bottom of hydraulic cavity (#638B)....this is not he ram cylinder relief valve that you mentioned (#984F)
This post was edited by JMOR at 09:35:25 12/27/12.

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