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Old 07-27-2015, 02:49 PM   #1
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HWH 310 System leaking

First off sorry for not being able to find this using the search feature. Everything I can find is about the jacks themselves leaking. When I go to extend the leveling jacks on my 2000 Coachmen Santara Class A coach I have a puddle of ATF fluid under the HWH pump. It does not continue to leak after the jacks are extended and the jacks stay down ( only had them tested to 48 hours). The leak only occurs when I am extending the jacks as far I as I can tell. I am no expert by any stretch but there are 4 cylinders which I believe are solenoids??? One seems to be wet on the bottom and the source of the leak. Is there an o-ring that would cause this? HWH is currently taking up to 1.5 weeks for a tech call back so I figured I would try this first.


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Old 07-27-2015, 03:25 PM   #2
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The high pressure hydraulic lines do not use O ring seals, they are compression fittings. It could be as simple as a loose fitting that a slight tightening will stop the leak. Many HWH jack system owners have reported bad hydraulic lines. Rather than wait for HWH to send another, you could remove the bad hose and take it to a local shop that could make you a matching hose at much less cost, time, and shipping waiting for HWH. It could also be a bad solenoid valve. You'll need to wipe up all dirt and fluid and operate the jacks to see where the leak is.

The shuttle valve that is attached to your pump can also leak, it does contain an O ring but I don't think it can be rebuilt by owner, it takes professional tools and measurements.


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Old 07-27-2015, 03:35 PM   #3
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Welcome to the forum.

First go up to the HWH Customer service site and download the 310 service manual. You may just have a leaking hose. Clean all the fluid up before you start and then have DW extend the jacks while you watch.

The area you refer to is the manifold assembly, one for each jack.

I downloaded the 310 manual with ease.

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Old 07-27-2015, 03:55 PM   #4
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Just don't get your fingers near a hydraulic leak, the pressures will inject the fluid right through your skin!

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 07-28-2015, 10:31 AM   #5
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check to make sure the o"rings between the pump housing and the manifold are intact.
the manifold is held onto the pump housing by two 1/4 inch threaded rods. they may have been loosened. that"s an area that would have a leak as described.
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hwh, leak

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