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Old 04-30-2014, 08:05 PM   #1
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Jacks down sensors location?

1998 Thor Windsport 33SL.

Picked it up today from a dealer. He told me the jacks down sensors on yhe rear jacks are bad. So, after bringing the jacks up, we would have to crawl under the MH and unplug the wires on both rear jacks once they are up.... Unless we like the scream of the warning buzzer.

I ask him where the sensors are, what the part numbers are and how hard they are to replace. His answer... Didn't know where the sensors are, didn't know the part number, but they are not hard to replace....

He said it is a HMH leveling system.

Anyone have any helpful advice?
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Old 04-30-2014, 10:58 PM   #2
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If you don't have one here's an HWH manual.
Lots of other info on their web site.
http://www.hwhcorp.com/
Attached Files
File Type: pdf HWH service manual.pdf (1,018.9 KB, 38 views)
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Old 05-01-2014, 07:37 AM   #3
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Cool beans, thanks.
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Old 05-01-2014, 08:02 AM   #4
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Quote:
Originally Posted by Virago-Rider View Post
1998 Thor Windsport 33SL.

Picked it up today from a dealer. He told me the jacks down sensors on yhe rear jacks are bad. So, after bringing the jacks up, we would have to crawl under the MH and unplug the wires on both rear jacks once they are up.... Unless we like the scream of the warning buzzer.

I ask him where the sensors are, what the part numbers are and how hard they are to replace. His answer... Didn't know where the sensors are, didn't know the part number, but they are not hard to replace....

He said it is a HMH leveling system.

Anyone have any helpful advice?
Virago-Rider
On my coach, (not a Thor), the one sensor for the RVA jacks, (not HMH), is located in the hydrulic jack reservoir itself.
If any one, or more, of the jacks are extended, (or the fluid is low in the reservoir), the alarm sounds continuously.
Hopefully that helps, (although HMH jacks may be different?).
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Old 05-04-2014, 08:34 AM   #5
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Found the jacks down switches, they are on top of each jack. Has anyone ever replaced theirs? I am wondering if the jacks have to come off the MH to do it. Also do the jacks need to be extended or retracted, or does it matter....???
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Old 05-04-2014, 08:50 AM   #6
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Found the jacks down switches, they are on top of each jack. Has anyone ever replaced theirs? I am wondering if the jacks have to come off the MH to do it. Also do the jacks need to be extended or retracted, or does it matter....???
Haven't had to replace them myself.
BUT, for the jacks to be extended they would be under pressure, so that would not be the time to replace them. Retracted in place, is my best guess.
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Old 05-04-2014, 08:54 AM   #7
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Have you checked to be sure the rear jacks really are FULLY retracted?

The cylinders are single acting, meaning that they are dependant on springs to retract. Compare the gap between the foot and the cylinder on the front and rear jacks when retracted. If the jacks have been out for an extended period there may be crud or corrosion on the rod preventing full retraction. If there is, maybe cleaning it off with Scotchbrite and WD 40 will help.

If you can safely get to them, you might try a pry bar on blocks of wood to see if you can push them up any after they have been retracted.
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Old 05-04-2014, 08:56 AM   #8
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Good idea, I'll try that in the next day or two.
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Old 05-04-2014, 10:38 AM   #9
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Just in case you didn't find this on the HWH web site.
Attached Files
File Type: pdf HWH jack & spring info.pdf (8.6 KB, 18 views)
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Old 05-05-2014, 08:32 AM   #10
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I don't know about all manufactuers systems but I do know on my Thor ACE there is no actual Jacks retracted sensor but rather the system uses a float in the Hydraulic reservoir to determine “position".
So if the fluid level is at all low ( even slightly ) it might not see the jacks as “retracted" even if they are.
I keep a pint of fluid stored next to the jack unit it's it's easy to " top it off".
And it will need it from time to time as these systems do leak a little over time.
Unfortunately there not as well built as a cars Hydraulic braking system.
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