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Old 10-03-2016, 05:20 PM   #1
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URGENT: Odd "hair dryer sound" coming from front of coach

Hi!

2005 Fleetwood Expedition 38N DP

Was in Mojave desert over the weekend. Very windy/dusty/sandy.

When leaving, pulled in slides and hit the jack retract button. After some minutes, did my walkaround. Jacks still partially down (about halfway raised) in front.

Cycled through auto level then retract a couple of times. Jacks seem to be stuck.

Figured I have enough clearance to head home and have it looked at in AZ.

As I'm leaving the venue, I stop, reverse, hear a clunking sound. Stop immediately, put in N, engage parking brake, run out to see what's going on. Nothing to see. Jacks still in halfway position too. Get back in.

Step on brake, release parking brake...and this weird sound like a small hair dryer starts. Engage P Brake, goes away. Release P brake, comes back. Makes same sound when driving now too.

Front air moving between 100 and 115, rear 110 and 125. So that's maintaining.

Any ideas??
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Old 10-03-2016, 06:33 PM   #2
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Update:

Might be leveling system trying to finish retracting the front jacks. Trying to get a mobile tech out here....
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Old 10-03-2016, 07:08 PM   #3
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What jack system? Common for HWH to not retract all the way. Clean and/or spray chrome cylinder with WD40. Alternately use a lever to pay pressure under the jack to help the retraction complete. I carry a 1" square bar about 6' long for this purpose.
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Old 10-03-2016, 08:01 PM   #4
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My HWH system only runs the hydraulic pump to extend the jacks, The big springs will retract the jacks when the solenoid valves open.

I suspect you are hearing the hydraulic pump running, but it has a interlock withh the parking brake. That is likely why it stops when PB is off.


You might try both batter disconnects which might reset the HWH controller (wild guess).

Regards,

Dan
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Old 10-03-2016, 11:13 PM   #5
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Thanks guys for the suggestions!

After hours on the phone with both Freightliner and Power Gear (whomever bought PG), then having a mobile mechanic come out, it mysteriously stopped.

No explanation why.

Maybe all the dust/sand??

Stopped for the night in Redlands, CA enjoying tortilla soup and a Cosmo...then zzzzz with the cats! Will resume the trip tomorrow
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Old 10-05-2016, 04:47 AM   #6
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Quote:
Originally Posted by GearGirl View Post
Thanks guys for the suggestions!

After hours on the phone with both Freightliner and Power Gear (whomever bought PG), then having a mobile mechanic come out, it mysteriously stopped.

No explanation why.

Maybe all the dust/sand??

Stopped for the night in Redlands, CA enjoying tortilla soup and a Cosmo...then zzzzz with the cats! Will resume the trip tomorrow

May be dust/sand on jack cylinders. Maybe return springs are getting a little lazy with age. I would extend jacks, clean cylinders when you get home. After cleaning, cycle them several times to check operation, clean a few more times between cycles. Carrying a pry bar to assist in jack retraction, if needed, is probably a good idea.

Not sure, but fluid return valve may be sticking on front jacks.
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Old 10-05-2016, 06:22 AM   #7
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Don't use WD-40! It is a wax based product that dries out leaving a thicker film that can affect moving parts. Sewing machine oil, spray silicone or similar very light based oil products will provide better lubrication. Spray the cylinders with brake cleaner, let dry and then apply the lubricant. A little is all that is require, no soaking or washing the cylinder.
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Old 10-05-2016, 06:30 AM   #8
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Originally Posted by hawk57 View Post
Don't use WD-40! It is a wax based product that dries out leaving a thicker film that can affect moving parts. Sewing machine oil, spray silicone or similar very light based oil products will provide better lubrication. Spray the cylinders with brake cleaner, let dry and then apply the lubricant. A little is all that is require, no soaking or washing the cylinder.

HWH specifies WD-40 for this purpose in the manual.
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Old 10-05-2016, 06:40 AM   #9
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Quote:
Originally Posted by hawk57 View Post
Don't use WD-40! It is a wax based product that dries out leaving a thicker film that can affect moving parts. Sewing machine oil, spray silicone or similar very light based oil products will provide better lubrication. Spray the cylinders with brake cleaner, let dry and then apply the lubricant. A little is all that is require, no soaking or washing the cylinder.
Actually HWH suggests using WD 40 to clean the jacks then wipe them off.
See this bulletin http://www.hwhcorp.com/ml47149.pdf Soap and water is OK too.

BTW WD 40 isn't wax based http://wd40.com/files/pdf/msds-wd482671453.pdf It's surfactant is listed as proprietary even after 60 years.
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