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Topic: HWH air bag leveling (Read 1278 times) previous topic - next topic

HWH air bag leveling

Coach has not been used for awhile, Just sold business so I'm trying to get bugs out, So we can start using it . One thing I did was sent HWH control box in because of intermittent problem with key pad,that was a couple of months ago all seemed good now driver-side in creeping down at a slow rate front seems faster. I know there is a front & rear manifold, Is that where HWH controller works on solenoids. I thought left to right leveling was rear only? But this seems to be dropping front worse. I do have a drawing on air schematcs but it does not show HWH controls.  Any advice? 
Art
1997 Prevost 40'
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Re: HWH air bag leveling

Reply #1 –
Art,

Find your HWH system here (see link)...probably the 600 Series.  Follow link to Operator's Manual.

HWH Operators Manuals for Foretravel

Here is the 600 Series Troubleshooting manual:  http://www.hwhcorp.com/ml19048.pdf

Also, a lot of info here:  Technical Help - HWH 
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: HWH air bag leveling

Reply #2 –
If this is happening while parked, sounds like an air leak in the air bags, or the solenoids in the front and rear manifolds, there is a great write up about this now and think it is titled new plungers for hwh
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: HWH air bag leveling

Reply #3 –
That is "Brand new replica hwh plungers
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: HWH air bag leveling

Reply #4 –
Quote from: prevostart –
I thought left to right leveling was rear only? 
That is true for ride height while in travel mode. There is one ride height valve at the center line of the coach that controls height at the front. There is a ride height valve on each side at the rear. Those control height at the rear, and each operates bags on only one side.

For leveling while parked (not in travel mode), the "six packs" control each corner of the coach. There is one "six pack" for the front and one for the rear. Each "six pack" is a manifold with six electrically operated valves that are controlled by the HWH leveling system.

FOT has replaced a few of the solenoids and valves on our coach. Some folk rebuild the "six packs." I don't worry about leaks that take days to manifest. If I develop a leak that puts the coach out of level in a few hours, I'll hire an expert to fix it. It's a relatively easy repair, but I have preferred to leave some repairs to folk with experience.
J D Stevens
1997 U295 CAI 36' Build #5085
2002 Subaru Outback
Motorcade 16869
Bellville, TX

Re: HWH air bag leveling

Reply #5 –
Blocked up coach crawled under with schematic and found front 6 pack, found # on hoses trying to understand, saw 7 hoses, 4 to bags, 2 to ride control and 1 to tank to supply air to system, front tank has regulator set to 50 psi is that OK?  then it was about 1/2 inch above safety bars next to bags 1 hour later it did not move, pulled out bars double clicked level button it dropped and leveled it still in same position 4 to 5 hours ? lack of use maybe crap was under seal in solenoid or o-ring . Is 50 psi good for front regulator?
Art
1997 Prevost 40'
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Re: HWH air bag leveling

Reply #6 –
Quote from: prevostart –
Is 50 psi good for front regulator?

Art,

The pressure in the front airbags when traveling should be about 45 psi while rear airbags require about 75 psi. 50 psi will work just fine as this will cause the front to raise slightly faster than if it was set at 45psi. and might have a little stiffer ride. The rear needs 75psi due to all the weight hanging behind the rear axle.

Pamela & Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: HWH air bag leveling

Reply #7 –
Quote from: prevostart –
...lack of use maybe crap was under seal in solenoid or o-ring.  Is 50 psi good for front regulator?
"Lack of Use" can cause a lot of strange air system problems, so very possible.  Take it out for a good exercise run, stop a couple times and run all the manual raise and lower switches up and down, raise coach to limits, then dump to stops.  Make sure it always comes back to ride height.  See if everything seems to be normal when you get back and park it.

Also applies to the other major systems in your coach: generator and air conditioners.  When we exercise our coach, I run the generator for at least 30 minutes under load (both A/C units running) while we're driving around.  Use it or lose it!

Most members find the OEM front manifold pressure regulator set to 60 psi or close to it.  Yours might be a little low - you can turn it up and see if it will accept the change.  If it acts cranky or won't adjust, just replace it.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: HWH air bag leveling

Reply #8 –
What regulates the rear system? The system has 120 psi coming off compressor to wet tank then to front left brake tank, then to rear right brake tank ?  Shows on drawings 80 psi switch at bottom of rear 6 pack, What is that I don't think it is a regulator, Is It ?
Art
1997 Prevost 40'
 The selected media item is not currently available.

Re: HWH air bag leveling

Reply #9 –
There is no regulator for the rear manifold - it simply operates at whatever pressure is in the rear tank.

The "system pressure switch" at the bottom of the rear manifold sends its signal to the HWH control box.  That pressure reading is used only as a low-pressure warning signal.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: HWH air bag leveling

Reply #10 –
After rereading my post I see the problem in what should have been said. It would be more clear if I had put it this way. The front needs at least 45psi to raise effectively and the rear will need  about 75psi. With lower pressure the ride height will react real slow.

Pamela & Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: HWH air bag leveling

Reply #11 –
Moved coach drove it parked it front left dropped again does that mean front left (raise) solenoid is leaking?
Where is rear HWH 6 pack manifold located
Art
1997 Prevost 40'
 The selected media item is not currently available.

Re: HWH air bag leveling

Reply #12 –
Quote from: prevostart –
Where is rear HWH 6 pack manifold located
On our coach, it is just aft of the rear axle, up above the start batteries, and behind the fuel water separator/filter.  On your coach, I don't know.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: HWH air bag leveling

Reply #13 –
It could be the raise or lower solenoid. I would remove the solenoids and replace the o rings as Chuck has and loved his write up about the job.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: HWH air bag leveling

Reply #14 –
Yes I found it right were Chuck said it would be ! Also no pressure sensors but it has a electric solenoid on lower air line which should go to rear air tank .
Art
1997 Prevost 40'
 The selected media item is not currently available.

Re: HWH air bag leveling

Reply #15 –
Quote from: prevostart –
Also no pressure sensors but it has a electric solenoid on lower air line which should go to rear air tank .
Not saying you are wrong, but I'm not sure what the function would be of a "solenoid" in that position.  Link below goes to a page describing the System Pressure Switch which is commonly located on the rear manifold.  Does the diagram on that page look anything like what you are seeing?  It might not be screwed directly into the manifold - a "T" might connect the switch and the air line.

LIke I said, I'm not disagreeing with you - I'm just trying to learn all I can about different versions of HWH air systems.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"