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Old 09-27-2019, 03:38 PM   #1
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Front Air Bags wont deflate via the Ride Height Control valve

I'm having a problem with my front air bags. They wont deflate (which is probably why my front end is so bouncy on rough roads).

I started working on this because the front ride height was too high so I tried to adjust the front Ride Height Control Valve and discovered air will not exhaust when I rotate the valve body downward. So, I ordered a new RHC valve and installed it today to find that its doing the same thing.

Then I removed the line coming "out" of the RHV going "to the front air bags" and no air is coming out. I believe there should be a straight path from the RHV through the HWH Travel solenoids to the front Air Bags. I checked the Travel solenoids (16 ohms) and they get magnetic when energized (so they are working). Maybe something inside the HWH body is blocked.

But air is going into the bags. I can manually deflate the bags using the HWH lower" button, and the bags deflate. Putting HWH into Travel mode and the air bags inflate.

So why can't I get any air on the air line going to the Bags at the RHV?

There is a Dump Air rocker switch on the dash. I'm not sure if this goes to the HWH manifold to dump air at the HWH 6-pack (and the HWH control panel has a Dump button already) or if there is a dump solenoid somewhere in the front end - maybe between the RHV and the HWH 6-pack. I cant find anything (but view is limited). If there was a Dump solenoid between the RHV and the HWH 6-pack, it would have to have a check valve in it (letting air into the bags but not letting it come out. But then how would the RHV do its adjusting when in travel mode if the air cant exit back through the RHV)?

This one has me stumped so far. The drawing below are from the HWH manual. I don't know if my Beaver is doing something different or has additional components.

Any ideas?
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*SMC-Bvr-Mnco History/Chassis Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring/Air Diagrams https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 09-27-2019, 04:25 PM   #2
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I don't have air leveling



But I have Air Dump switch on the dash. This switch controls these valves
https://www.ebay.com/itm/MAC-VALVES-...75.c2#viTabs_0
There is one mounted on the fire wall for the front axle and there are 2 mounted back in the engine compartment. I believe the work in conjunction with the right height valves. On my coach there is a fuse in the front drivers side electrical bay for these valves & switch.
The dump valves and switches are shown on the wiring diagrams.
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Old 09-27-2019, 04:27 PM   #3
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Mike , I have been dealing with a similar problem on my 03 Windsor .


I realized one day I could not lower the right front .

First I thought dirt daubers so I cleaned every hole I could find to no avail .
Then I started to do a little trouble shooting and realized that the front 6 pack
manifold has 2 pressure switches , right & left

Now I'm not sure what they actually do because some models don't even have
them

I found if I unplug the right side pressure sw I can raise and lower
that side now .
I see them on the diagrams you posted and it appears they do connect in some
way with the exhaust



Ray
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Old 09-27-2019, 04:40 PM   #4
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Like you I thought they vented through the RHV
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Old 09-27-2019, 05:14 PM   #5
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I think I got this fixed.
I removed the two Travel valve solenoids and brass valves from the HWH 6-pack. I had a couple of the brass valves left over from when I rebuilt the rear 6-packs so I installed those (used the same coils).

It looks like the brass valves were not allowing air to pass threw even though the electrical part (the coils) where working. I'm still not sure how the air bags were filling - but at least the RHV is letting the air out as needed now.
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Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift
*SMC-Bvr-Mnco History/Chassis Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
*SMC-Bvr-Mnco Wiring/Air Diagrams https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 09-27-2019, 05:53 PM   #6
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GREAT CATCH!, will save your drawing with the notes
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