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Case Tractors Discussion Forum
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Re: Case hydraulics

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Joe (Wa)

09-05-2013 14:06:35

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Most all leaks on the control valve side of the rockshaft is the result of plugged leak-off tubing and/or piston seal leakage in excess of tubing capacity.

The vent-leak off tubing conveys piston seal leak-bye back to the torque tube. If the tube is plugged or the leak-bye is beyond the capacity of the tubing, oil level rises in the rockshaft housing and leaks out the control valve side which has no seal or gasket.

To measure piston seal leakage, pull the vent-leak off tubing off at the fitting. Cycle the hitch up and down about 10 times to void the collected oil in the rockshaft housing. Put the draft arms up with some weight. You should be down to a slow, intermittent drip or the piston seal needs changed.

1953 VAC should have 2 O-rings for piston seals unless it has been changed back to the older leather cup piston. Very easy fix if that is the problem.


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09-06-2013 09:50:34

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 Re: Case hydraulics in reply to Joe (Wa), 09-05-2013 14:06:35  
Thanks Joe

So I simply take off the piston, and find some giant o rings?

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Joe (Wa)

09-06-2013 20:02:09

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 Re: Case hydraulics in reply to Bill_Bier, 09-06-2013 09:50:34  
That"s about it, unbolt the cylinder, lift it off the piston will be inside. The piston and rod are not connected, rod just rests in the piston socket. Blow the piston out with puff of air at the hyd fitting.

O-rings are not huge, just around 4" as I remember it. Any hydraulic shop can fix you up for less than a saw buck.

I can look up the current Case p/n if you want to go that route. Case still had them available a couple of years ago, no different than what you can buy elsewhere.


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