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Old 03-28-2023, 05:35 PM   #1
TSB
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Join Date: Mar 2023
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Slide/leveling jacks not working, HWH pump inop

Wanted to share my experience with an inoperative leveling system and hydraulic living room slide, sorry if this has already been posted......

Recently my HWH leveling system stopped working. I had power at the dash control, but the jacks would not move/retract from the extended position. I was curious if the main living room slide would operate, as this is also hydraulically operated. Alas, it would not, indicating some issue with the hydraulics, common to both systems.

I made some quick checks at the pump, confirming I had 12v power reaching the relay, and I confirmed all inline fuses were OK. I also took a jumper wire and ran it from the relay 12v battery lug directly to the pump motor to see if the pump would operate; it did, telling me power was not getting to the pump for some reason.

At this point I decided I could start replacing components, or consult the internet for assistance. Surprisingly, I quickly found an HWH service manual online and was able to print it out, ugh, all 52 pages of it.

The service manual contains a very good troubleshooting section. It leads you in a systematic, logical progression through various checks and tests. In my case, the Master Relay failed its test. This also passed my personal logic test as it made sense that a failed relay would not allow power to transfer from the battery to the pump motor.

I located a replacement Master Relay online from Northwest RV Supply, although I think they in turn bought it from HWH Corporation and had it shipped directly to me. They were the cheapest I could find, total cost about $61 including shipping.

Installation is quick. Disconnect positive terminal from the chassis battery to prevent shorting, then simply disconnect wires from old relay and connect them to the new relay, using the old relay as a guide. The new relay does come with installation instructions if you want confirmation you are doing things properly. The relay itself is clamped to the starter motor and the clamp must me loosened with a straight-blade screwdriver or wrench to allow for removal of the old relay and installation of the new one. Reconnect the chassis battery and you are done.

I would strongly recommend locating and printing out a copy of the service manual. It really helped me out in this case. Always nice when you can confirm a component needs replacing before you get the credit card out!
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Old 03-29-2023, 10:03 AM   #2
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I wish you would have posted earlier, I could have saved you a bit of money.
Without knowing the model number of your HWH system, you should have 3 solenoids. I bought the 2 slave solenoids off Amazon for about the same cost of one from Northwest Supply.
For future reference, the improved replacement motor is available from Northern Tool for $194.
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Old 03-30-2023, 06:28 AM   #3
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Thanks for info. Guess I should clarify, we did see lower prices, including Amazon. Just concerned about aftermarket parts. I’ve had mixed success in that arena, and with a 1-month trip in the very near future, we didn’t want to take any chances. The photo for the part we bought matched our part exactly, down to the stickers. I’ll keep the pump motor tip in my back pocket for future use. Thanks again.
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