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Case Tractors Discussion Forum
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Cylinder Rod Seal - Which way should it be installed?

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Mike Fallavolli

11-18-2007 12:08:14




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Hi all,

I'm putting new packing and seals in the boom cylinder of my 530CK. The rod seal has a channel in one side and is flat on the other. Can anyone tell me which way it is supposed to be installed? My gut says that the channel should be toward the cylinder and the flat part toward the outside. I'd just like a confirmation before putting this thing back into the machine.

I've attempted to take and post a picture of the seal here.

Thanks,

-- Mike

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Doc Larry

11-19-2007 04:45:00




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 Re: Cylinder Rod Seal - Which way should it be installed? in reply to Mike Fallavollita, 11-18-2007 12:08:14  
Flat side out.



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Ken L.

11-18-2007 13:04:46




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 Re: Cylinder Rod Seal - Which way should it be installed? in reply to Mike Fallavollita, 11-18-2007 12:08:14  
By saying rod seal, I'm taking it that this seal goes in the end gland of the cyl and the rod slides through it. If this is an inside seal that keeps the oil inside the cyl. tube, the way you have it laying in the picture, the top side would be the oil side meaning the flat side would face the outside. If it's a dirt seal and fits on the outside of the gland to wipe dirt off the rod, the top side in your picture would go to the outside.

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Mike Fallavollita

11-18-2007 13:09:10




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 Re: Cylinder Rod Seal - Which way should it be installed? in reply to Ken L., 11-18-2007 13:04:46  
Ken, yes it is an oil seal that goes in the middle of the end gland just as you describe; the rod comes through it. This seal is in the middle of the gland. There are two additional seals (plastic with o-rings pushing them against the rod) that I believe are the dirt seals.

Sounds like you've confirmed my feeling...thanks.

-- Mike



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Jim B

11-18-2007 19:25:31




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 Re: Cylinder Rod Seal - Which way should it be installed? in reply to Mike Fallavollita, 11-18-2007 13:09:10  
Any sealing logic I've ever seen for: grease, oil, air, hydraulic, water, ect., the open side of the sealing lip faces the fluid and/or internal pressure. This pressure therefore is exposed to more surface area of the seal lip than the atmospheric (flat) side of the seal. The pressure difference therefore assures seal lip contact with the shaft, tube, pipe or whatever passes thru the seal.



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Ken L.

11-18-2007 13:28:15




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 Re: Cylinder Rod Seal - Which way should it be installed? in reply to Mike Fallavollita, 11-18-2007 13:09:10  
I would say that you are correct on the dirt seals.



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