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Old 12-30-2015, 11:14 AM   #11
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Jack leak down

Glad you fixed your problem. How did you originally come to the conclusion that it was the jack and not a problem with the pump or solenoid valve? It just seems to me that if the jack holds the motorhome up (being under a lot of weight) without problems then it should not leak down when retracted and under no weight. If the internal orings leaked by in one direction, it should leak by in the other direction. Am I missing something here?
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Old 12-30-2015, 04:28 PM   #12
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Bwat will be able to explain further but I believe there are two sides with o rings one up and one down, lines go into the cylinder on top and on bottom side which means there is two sets of o rings. One holds pressure when up and the other holds pressure when down.
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Old 01-01-2016, 10:38 PM   #13
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Quote:
Originally Posted by rvgreg View Post
Glad you fixed your problem. How did you originally come to the conclusion that it was the jack and not a problem with the pump or solenoid valve? It just seems to me that if the jack holds the motorhome up (being under a lot of weight) without problems then it should not leak down when retracted and under no weight. If the internal orings leaked by in one direction, it should leak by in the other direction. Am I missing something here?

Here is the easy worded answer. When the jack piston is on the ground, the piston cannot move. If the coach begins to drop the cylinder must be moving. Remember the oil pressure is the same on both sides of the piston and its two o'ring seals. The system is called balanced and the pump must start to change piston position. Unless the piston seals are worn or damaged (due to trash in the cylinder) or other reasons. The under weight the cyl will slip downward while seals are bypassing.
It doesn't happen when stowed because of lack of heavy load. Pump problems only surface when in use, not when stationary. Sol. valves leaking will result in tank level rise. The two rings per piston are round syn rubber and back each other, non directional.
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Old 01-01-2016, 10:39 PM   #14
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Thanks to all for replies on my posted hydraulic jack "slip-down" problem on a 2006 Georgetown 370xl. Took the jack to Atlanta International Hydraulic Repair. They took apart, replaced O-rings, etc. Cost was $186 and had back next day. I reinstalled, and works great.

Great news!
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