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Eaton pump

T

T.R.K.

Well-known Member
Does anybody have any tips for fixing an Eaton hydraulic pump that has begun to ooze oil between the sections while sitting? This is the rotor style pump.
 
(quoted from post at 18:13:52 09/20/21) Does anybody have any tips for fixing an Eaton hydraulic pump that has begun to ooze oil between the sections while sitting? This is the rotor style pump.
Click to expand...

There is a large O ring in between the sections I believe.
 
I was hoping for something in there. I was afraid it was just two precision surfaces clamped together originally. If it is just an o-ring,
my local hydraulic shop may be able to help.
 
(quoted from post at 17:58:45 09/23/21) I was hoping for something in there. I was afraid it was just two precision surfaces clamped together originally. If it is just an o-ring,
my local hydraulic shop may be able to help.
Click to expand...

I think the original is actually a square edge "gasket" / O ring. I believe you can get by using an O ring if it is fitted properly without too much protrusion or it could cause binding on the halves of the pump. A hydraulic shop should be able to fit it properly for you. I can get you a part number if you need it.
 
Thanks for replying again Alan.

It does look like a square o-ring on the breakdown. I have replaced the square o-ring in the adapter flange with a common round o-ring
before on my (Dad's) ZB. In fact, The common 0-ring has lasted far longer than the last OEM replacement I put in there. (It does have to fit
snugly in the outer diameter of the groove. The last OEM O-ring fit snugly on the ID, and I guess it soon failed from having to stretch to
the O.D. every time it got under pressure.

Right now, since the swivel adapter in the lower port is staying wet, I am hoping I can get by just replacing it. The hose is already new. I
may still have to go inside the pump.
 
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