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Old 11-04-2009, 09:43 PM   #1
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How to Diagnose and Fix a Bad Leveling Jack

In a recent information bulletin (4/30/2009), HWH summarized the diagnostic procedure for dealing with a leveling jack that doesn't retract properly. The document is for the 325 series system but it applies to many of their leveling systems. I've added some text to clarify a few issues.

Diagnostics-slow or non-retracting jacks:

If a jack will not retract or is slow to retract, the problem is the jack, the solenoid valve, the velocity valve (if so equipped), or the hose. Slowly remove the hose from the jack (at the jack). If the jack does not retract properly, replace the jack. If the jack starts to retract properly, tighten the hose and loosen the hose at the manifold (at the main control unit). If the jack does not retract, there is a problem with the hose, such as a kink. If the jack retracts and the manifold is equipped with a velocity valve, the velocity valve is most likely the problem. If there is no velocity valve, there may be a problem with the solenoid valve or possibly the outer check valve. Bad solenoid valves are common and are relatively easy to replace. Most folks use channel-lock pliers. Hand-tighten the solenoid valve and then tighten it with the pliars. Don't overtighten it. When you're done, replace the bad fuse (see below), check for leaks, and replace the plexiglas cover.

Note: A blown fuse (15 amp blue) for the problem jack is a give-away that the solenoid valve is probably bad. The fuse will be located at the upper porting of the circuit board that is behind the Plexiglas cover. The board will be attached to the system's main control unit. Keep in mind, the position and order of the fuses is not the same as the position and order of the solenoid valves. Refer to your manual to see which fuse goes to which jack. Never replace a solenoid valve with the problem jack in the down (extended) position. It will spew hydraulic oil everywhere (since the system will be under pressure). If the solenoid valve is bad, the jack should retract when you loosen the hose at the manifold. Then you can change out the solenoid valve.

Hopefully, this will enable others to figure out the actual source of a commonly encountered problem. In any event, be sure to call HWH when you have a problem. They may take a little while to get back to you but they always do. Plus, they're very helpful when you have a problem with your system.


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Old 11-05-2009, 03:03 AM   #2
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Thanks Jack.

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Old 11-05-2009, 04:42 AM   #3
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Good info.

However, for a slowly retracting jack, it may be that the jack just needs lubrication, which is usually the case.
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Old 11-05-2009, 12:36 PM   #4
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Originally Posted by Route 66 View Post
Good info.

However, for a slowly retracting jack, it may be that the jack just needs lubrication, which is usually the case.

Where do you lubricate a hydraulic leveling jack?
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Old 11-05-2009, 01:07 PM   #5
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Originally Posted by mfolsom View Post
Where do you lubricate a hydraulic leveling jack?
I have 1 Zerk fitting at the base of each leveling jack. Make sure you use the correct lubricant for your coach. I then extended the jacks and wiped them down with a good quality silicone product.

An acquaintance on another board (Hardy1000) also showed me how to make a bracket for the Power Gear tank that was not properly supported and caused some minor leakage. The bracket is a short piece of angle bar, 2 electrical clamps and a 7" hoop clamp. Works like a champ and the movement of the jacks was quicker then it was before. So, if you have the Power Gear hydraulic system, check your unit and see if it is properly braced on both sides. It DOES make a difference.

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Old 11-07-2009, 08:31 PM   #6
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good info, for HWH jacks.

Powergears are a bit different.

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