lifting problem on 1950 case vac

handcrank

Member
lift will not stay in the raised position and oil is seeping out of the end's of the rock shaft.Could it be a seal of some sort in the rock shaft cylinder?If so,is it something that I can take care of myself?This is all new to me.Any help greatly appreciated, Don
 
the piston in the lift has 2 orings they are avaliable from case a little over 5.00 dollers each i just picked some up at my local dealer a few weeks ago my brother has a vac in his shop with the same problem
 
His VAC probably has the leather cup type piston. That is also available still but is $$. If the oil is leaking out I would also check the breather line that comes out of the bottom of the rockshaft as it is supposed to drain all the leaked oil back into the torque tube.
 
1950 will have the piston with the leather cup unless it has been upgraded to the piston with 2 O-rings.

The vent-leakoff 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.

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.

Cup is easy to change. If you can"t enlarge the 2nd pic enough for reading, go to the link below, scroll down to page G7 D17 at the bottom. Click on the page to enlarge for reading.

It is important to follow the instructions and get the cup centered or you"ll never get it in the cylinder without damage. Clean the grease out of the rockshaft and make sure the vent-leakoff tube is clear back to the torque tube.

Joe
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Eagle Hitch piston
 
JOE,you nailed it.The leather had a two inch tear. I don,t have a dealer near me.D o you have any idea w here I could get one? T hank you so much, Don
 
I haven"t changed a cup in 5 years. Always got it from a dealer.

Cup original p/n V22900 changed to p/n A30798.

You might try John Saeli. I don"t find it on his website but may have them or can direct you to an aftermarket vendor. John will know exactly what you need and go the extra mile to help you if he can.

Joe
John Saeli
 

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