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Old 11-12-2012, 04:49 PM   #1
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Hydraulic Jack

Hello fellow rvers, I have a 99 discovery and I notice one of my jack has oil dripping on my wood plank underneath the jack, how hard it would be to change the seal, wonder if it's a diy job or it's call for a mechanic, I'm mechanicly incline to a point, wondering??

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Old 11-12-2012, 05:22 PM   #2
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Jack disassembly and repair is a pretty specialized job, and not normally done by even a good shade tree mechanic. I've been maintaining trucks, cars, RV's and all types of farm machinery for years, and I wouldn't attempt it. If you can find a good hydraulic shop you'd be in good shape. Most general repair shops will either send the work out to one of these or try to convince you that you need a new cylinder.
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Old 11-12-2012, 05:48 PM   #3
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Is the return spring internal or external on that jack?
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Old 11-12-2012, 08:01 PM   #4
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External, thx for the info I'll have it done by a mechanic seem to be to much for meto handle.
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Old 11-12-2012, 08:19 PM   #5
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Before you rebuild the jack, check to see if it has a grease zerk along the bottom of the cylinder. If it does, shoot a little grease into the zerk. The grease is designed to seal the jack. This has worked on many jacks
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Old 11-12-2012, 11:22 PM   #6
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Before you do anything, except perhaps grease the zerk mentioned above, clean the cylinder well and then cycle the jacks a couple of times. Then extend them but make certain that they don't extend them more than half their length. If you extend them too far they sometimes will leak when the seals start to get old. Hope it works for you.
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Old 11-12-2012, 11:37 PM   #7
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Then extend them but make certain that they don't extend them more than half their length. If you extend them too far they sometimes will leak when the seals start to get old.
How long does that take? I've left my fronts fully extended for up to six months for some 10 years now and have no leaks.
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Old 11-13-2012, 07:20 PM   #8
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Before you do anything, except perhaps grease the zerk mentioned above, clean the cylinder well and then cycle the jacks a couple of times. Then extend them but make certain that they don't extend them more than half their length. If you extend them too far they sometimes will leak when the seals start to get old. Hope it works for you.
Thx to all I will just do that, hopefully it'll work.

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