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Old 11-16-2017, 12:23 PM   #1
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HWH jacks will not extend

I had a power surge from shore power source, it took out my inverter, $2,000 later everything works except my Hydrauloc jacks ( could be coincidence ?) they were ok prior to the surge.
The motor works but does not create hydraulic pressure? it sounds like it would if it had no oil,(oil level is ok)
When i press the buttonl for extend jacks pump operates, "the jacks are stored" when i press the up buttons i hear is a click from the pump area.
are ther fuses i dont know about or something i am overlooking?
All the "T" bars are closed,
I need help due to the fact that we are supposed to leave for South in 2 weeks.

Dave J facepalm:
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Old 11-16-2017, 02:23 PM   #2
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Look online for a service manual for your model of HWH jacks. You might find out that an electronic circuit board got fried by the power surge, although I realize that should have only surged through 120v circuits, not 12v, but you did mention the inverter/charger got fried. It could also be the solenoid valves failed since the pump works but no hydraulic fluid flow to the jacks.
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Old 11-16-2017, 02:49 PM   #3
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I had a 2003 Adventurer and the HWH control box was under the dash to the left of the steering column (floor level behind a carpeted panel).

You might check that all the fuses are good as a start.

Search for azpete here on the forum - (I believe) he's retired from HWH and has offered his help here on iRV2. He has listed his contact info on many posts.

Best to get the manual and familiarize yourself w/ the troubleshooting - HWH has done an excellent job w/ manual and the troubleshooting section.
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Old 11-16-2017, 03:21 PM   #4
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Your jacks run on 12 volt power. A problem with the 120 volt should not affect your jacks. I believe that the motor is directly connected to the pump, so if the motor for the jacks in running, the pump should be too.

Your problem sounds to me to be the shuttle valve. When it fails the hydraulic fluid goes around in circles instead of going to the jacks or slides.

Do you know what HWH system you have?
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Old 11-17-2017, 05:33 AM   #5
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Call HWH. Their techs will call you back and walk you through troubleshooting the problem. A few weeks ago my system started acting and their tech helped me isolate the problem. Make sure you have your coach info like make model VIN and the HWH model and serial number.
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Old 11-17-2017, 10:06 AM   #6
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dave, the power surge wouldn't ordinarily effect your hwh system, unless it is connected to the house batteries. if so, it may have fried the board. but generally, it fries the 12 volt relays too, so the pump wouldn't run. i have not seen a hwh system connected to the engine battery harmed by a power surge.
if the pump motor runs and sounds like it freewheeling, you need to check pump pressure. attach a 5000 lb pressure gauge to the 90 degree fitting on top of the manifold. its the one on one end of that small u tube on top of the manifold. the other end goes to the shuttle valve.
if there is very low pressure or no pressure, the pump should be replaced.
if the pressure is around 3200 lbs, i would remove the shuttle valve for inspection. look thru the small hole on the bottom of the valve. if the little nut is missing, replace the valve. RAP7964
some have had luck replacing the 3/16 nut on the end of the internal shifter.
if the nut is missing, it usually washed back into the tank, so there's no danger of it being lodged in the manifold somewhere.
let me know if i can help. 1-602-549-3638
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Old 11-18-2017, 12:01 AM   #7
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I had the same problem on my 325 hwh system and it was the 50 psi switch, change that and all is ok.
Try this; http://www.hwhcorp.com/ml37640.pdf
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Old 11-18-2017, 12:16 AM   #8
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Quote:
Originally Posted by azpete View Post
dave, the power surge wouldn't ordinarily effect your hwh system, unless it is connected to the house batteries. if so, it may have fried the board. but generally, it fries the 12 volt relays too, so the pump wouldn't run. i have not seen a hwh system connected to the engine battery harmed by a power surge.
if the pump motor runs and sounds like it freewheeling, you need to check pump pressure. attach a 5000 lb pressure gauge to the 90 degree fitting on top of the manifold. its the one on one end of that small u tube on top of the manifold. the other end goes to the shuttle valve.
if there is very low pressure or no pressure, the pump should be replaced.
if the pressure is around 3200 lbs, i would remove the shuttle valve for inspection. look thru the small hole on the bottom of the valve. if the little nut is missing, replace the valve. RAP7964
some have had luck replacing the 3/16 nut on the end of the internal shifter.
if the nut is missing, it usually washed back into the tank, so there's no danger of it being lodged in the manifold somewhere.
let me know if i can help. 1-602-549-3638
paul maddox
i do not sell parts, solicit or accept service appointments on this forum.

THANKS Paul for all your FREE advice! You've saved a lot of us lots of time and effort with your shared knowledge.
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