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Case Tractors Discussion Forum

1030 Rockshaft seals

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04-10-2009 18:36:01

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Need a little help. I have a 1030 at the shop which has repeatedly blown rockshaft seals over the last few years. I just replaced the rh seal and was informed that the customer had done a couple himself, and upon removal of the old one the pressure lip was blown right out under the dirt wiper. I know that the bushings are lubed but what could allow that much pressure on the seal, the bushings seem to be tight enough to keep the shaft from moving. Have any of you guys had anything similar, I would like to know that I have covered all the bases before it goes home, a considerable distance from our dealership. Thanks in advance, mEl

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Roger . Link

04-13-2009 10:14:02

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 Re: 1030 Rockshaft seals in reply to mEl, 04-10-2009 18:36:01  
In years past we had that problem also.If I remember we found the lube hole under the sensing cover,made a plug to fit it and drilled a small hole to limit the lube oil flow.Sometimes we even pluged the hole where there would be limited 3 point use.

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04-12-2009 05:31:17

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 Re: 1030 Rockshaft seals in reply to mEl, 04-10-2009 18:36:01  
mEl, I know you probably already checked this but sometimes when we are so convinced that one thing is happening it turns out to be another.

Since this is happening over and over, did you think of a mechanical displacement of the lip rather that pressure?

If a part, the rockshaft, got through inspection at the plant (or has been damaged over the years) a surface finish that is not quite up to par and exhibits a slight helical surface could actually screw the lip out. After 35 years around oilfield manufacturing shops I have seen a lot of starge things happen during the machining processes and not be caught in inspection as the problems are so small or thought to be insignificant. As we all __it happens.

Might want to check with the owner and ask if the shaft had ever been damaged, weld repaired and remachined. Just a thought.


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04-11-2009 07:00:55

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 Re: 1030 Rockshaft seals in reply to mEl, 04-10-2009 18:36:01  
Any chance he doubled the seal over installing it? I had the same problem with my 2090 3 years ago. It took me the third try before it held, and I did not double them over. I cannot explain it. It is an honor to try to help the master!

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John Saeli

04-11-2009 04:27:10

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 Re: 1030 Rockshaft seals in reply to mEl, 04-10-2009 18:36:01  
Hry MeL: I think this is a surprise quiz from the master. My guess would have to be a plugged housing vent, and I believe the only venting it recieves is through the fill cap. If that isn't the problem, is the rockshaft sliding side to side for some reason?

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04-11-2009 04:48:29

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 Re: 1030 Rockshaft seals in reply to John Saeli, 04-11-2009 04:27:10  
lOOKED AT DIAGRAM. Could right side of shaft being smaller be slightly bent? Too much end play?Vent ?Correct bushings?

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04-11-2009 05:11:00

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 Re: 1030 Rockshaft seals in reply to ca.hess, 04-11-2009 04:48:29  
The shaft seems ok and there is no appreciable end play. The vent thing I considered but the dipstick o ring is not that tight even and if the linkage box is open to the trans case which it is then even the boots on the shifters would probably breathe enough to dissipate pressure. As previously stated, the pressure lip was pushed right out under the dirt lip and that should take an extreme amount of pressure. One would think that normal bushing clearances would allow oil to flow to the inside without building excess pressure. keep the ides coming. mEl

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04-11-2009 06:18:17

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 Re: 1030 Rockshaft seals in reply to mEl, 04-11-2009 05:11:00  
Are bushings or casting to have relief grove in there for oil return. ? I never seeen one so just dreaming.

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