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04-30-2014, 08:05 PM
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#1
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Senior Member
Join Date: Apr 2014
Location: Oklahoma
Posts: 681
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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?
__________________
1998 Thor Windsport 33SL
2007 Chevy Uplander toad (tow master dolly)
1985 Yamaha Virago XV700
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04-30-2014, 10:58 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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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/
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-01-2014, 07:37 AM
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#3
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Senior Member
Join Date: Apr 2014
Location: Oklahoma
Posts: 681
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Cool beans, thanks.
__________________
1998 Thor Windsport 33SL
2007 Chevy Uplander toad (tow master dolly)
1985 Yamaha Virago XV700
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05-01-2014, 08:02 AM
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#4
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Registered User
Join Date: Mar 2010
Posts: 8,777
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Quote:
Originally Posted by Virago-Rider
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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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?).
Mel
'96 Safari
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05-04-2014, 08:34 AM
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#5
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Senior Member
Join Date: Apr 2014
Location: Oklahoma
Posts: 681
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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....???
__________________
1998 Thor Windsport 33SL
2007 Chevy Uplander toad (tow master dolly)
1985 Yamaha Virago XV700
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05-04-2014, 08:50 AM
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#6
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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Quote:
Originally Posted by Virago-Rider
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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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.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-04-2014, 08:54 AM
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#7
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Member
Join Date: Aug 2013
Location: St Simons Island, Georgia
Posts: 30
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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.
__________________
Not full-timers (yet)
2008 Gulfstream Tourmaster 40B, Cummins ISL 425, Allison MH3000; 2013 Ford C-Max with Air Force One, 4 wheels down; Cricket golf cart stowed inside the C-Max
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05-04-2014, 08:56 AM
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#8
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Senior Member
Join Date: Apr 2014
Location: Oklahoma
Posts: 681
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Good idea, I'll try that in the next day or two.
__________________
1998 Thor Windsport 33SL
2007 Chevy Uplander toad (tow master dolly)
1985 Yamaha Virago XV700
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05-04-2014, 10:38 AM
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#9
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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Just in case you didn't find this on the HWH web site.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-05-2014, 08:32 AM
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#10
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Member
Thor Owners Club
Join Date: Sep 2011
Location: Pleasant Hill, Ca.
Posts: 57
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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.
__________________
Thor 2012 A.C.E. 29.1 , Cheap Handling Fix, Safe-T-Plus, SuperSteer Front & Rear trac bars, 2013 Honda CRV on Blue Ox Aladdin tow bar, Blue Ox Patriot Brake
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