1010 Hydraulic Pump Seal

Mnethercutt · Aug 6, 2017

Replacing the shaft seal on my pump (part no 17 in diagram). Do I need to disassemble the pump to replace the seal or does it just fit on the shaft (no 7) and then slide down into the housing?

JDEM · Aug 6, 2017

If you can get the old one out, you can put in the new one without taking the pump apart - assuming you have the Cessna pump
like in the photo. Early 1010s used Webster-Electric pumps.

Keep in mind that seal is NOT a high-pressure oil seal. If it has been blowing out on you, a new seal is NOT the fix.

Mnethercutt · Aug 6, 2017

depends on what you mean by blowing out. All I know is that hydraulic fluid is slowly leaking down into the pump housing adapter, I thought that would be the seal needing replaced and I can see that it is visibly falling apart.

JDEM · Aug 6, 2017

When the pumps get internal wear - high pressure oil gets to the external seal and sometimes actually push it out of the
housing. There is a spider-web high-pressure gasket and thrust plate inside the pump that does all the high-pressure sealing.
All that seal does is act as a dust and residual oil seal. Certainly won't hurt to stick a new one in and see what happens.

Bob · Aug 6, 2017

Typically, the seal area is ported back to the suction side of the pump, and the seal doesn't "blow out" unless the ump is REALLY badly worn, or the "spider web" gasket jd mentions is broken or hard and brittle.

1010 Hydraulic Pump Seal

Mnethercutt

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JDEM

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Mnethercutt

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JDEM

Well-known Member

Bob

Well-known Member

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