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Old 10-30-2015, 06:14 AM   #1
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Air suspension operational question

Scenario:
I park for the night and dump the air out of the suspension using the HWH control panel, but I don't extend the stabilizer jacks.

Question:
Which of the following will cause the suspension to air up in preparation for travel? (Air gauges for breaks still show about 100-120 psi when ready to go.)
(1.) Simply start the coach. The air pressure will build and the suspension will air up without further action.
(2.) Start the coach and press the "Store" button that retracts the jacks, even though they were not extended. The suspension will not inflate until the "Store" button is pressed.

I recently had the suspension fail to air up automatically after starting the engine but I had not extended the jacks on either of the two occasions this has occurred. I am trying to determine if additional action is required to initiate the airing up of the suspension or if there may be a problem that requires further investigation and possible repair.
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Old 10-30-2015, 06:47 AM   #2
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On my 08, the unit will air up without touching the store button. Why do you dump air when stopping for the night if you are not using the jacks? Do you know that turning on the cruise control and pressing set while you are in neutral will bring the engine to high idle and air things up faster? hope this helps, mark
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Old 10-30-2015, 07:17 AM   #3
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Quote:
Originally Posted by MCJones View Post
...Why do you dump air when stopping for the night if you are not using the jacks?
When the coach is being stored for a period of time I let the air out of the suspension but there is no need for the jacks.
Quote:
Originally Posted by MCJones View Post
Do you know that turning on the cruise control and pressing set while you are in neutral will bring the engine to high idle and air things up faster?
Yes, I use the fast idle all the time. In the scenario I described of just starting the engine, even set to fast idle, it idled for over 5 minutes with the breaks at 120 psi and no air in the suspension at all. After I moved the coach forward a bit the suspension came up right away.
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Old 10-30-2015, 11:56 AM   #4
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Mine does not always air up even though the air pressure comes up. I push the store and the bags inflate.
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Old 10-30-2015, 04:12 PM   #5
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Quote:
Originally Posted by Ron_H View Post
Scenario:
I park for the night and dump the air out of the suspension using the HWH control panel, but I don't extend the stabilizer jacks.

Question:
Which of the following will cause the suspension to air up in preparation for travel? (Air gauges for breaks still show about 100-120 psi when ready to go.)
(1.) Simply start the coach. The air pressure will build and the suspension will air up without further action.
(2.) Start the coach and press the "Store" button that retracts the jacks, even though they were not extended. The suspension will not inflate until the "Store" button is pressed.

I recently had the suspension fail to air up automatically after starting the engine but I had not extended the jacks on either of the two occasions this has occurred. I am trying to determine if additional action is required to initiate the airing up of the suspension or if there may be a problem that requires further investigation and possible repair.
Ron,
Can I assume you have the HWH 625 Computer Controlled Automatic Leveling system? If so, you should have two means of dumping.
1. Push the Power button on the control panel once for powering up the system. Push again, to trigger the HWH controlled dump system.

But, that will also trigger the jack system to automatically level the coach.

2. Use the Manual Dump valve, supplied by Freightliner, to empty the bags. That will NOT trigger the jacks.

But, while I've gone through the operation, maintenance and troubleshooting manuals for HWH, I do not recall that, the suspension will AUTOMATICALLY fill, just because you started the engine. At this point, in my opinion, for that particular system, you will INDEED, have to push the STORE button for the suspension to fill.

What happens when Ciderdog and, a few others have put the coach in gear, let off the parking brake is, the system (HWH) detects that and assumes control over the leveling system and, retracts the jacks(if they're down) and, will fill the bags.

So, short answer, yes, I do believe you have to use the Store button if you want the suspension to air up.
Scott
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Old 10-30-2015, 09:03 PM   #6
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What FIRE UP said is exactly how my HWH system functions. I know that for a fact, and will never forget it; because it cost me a $150 "house call" from a local HDT service shop to learn the lesson.
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Old 11-01-2015, 03:03 PM   #7
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I have found that the system doesn't want you to drive away without the suspension aired up. As you said in your post, once you started to drive, it aired up. Just put the coach in Drive and then give it a few seconds to fill the bags.
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Old 11-01-2015, 03:31 PM   #8
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Quote:
Originally Posted by Ron_H View Post
Scenario:
I park for the night and dump the air out of the suspension using the HWH control panel, but I don't extend the stabilizer jacks.

Question:
Which of the following will cause the suspension to air up in preparation for travel? (Air gauges for breaks still show about 100-120 psi when ready to go.)
(1.) Simply start the coach. The air pressure will build and the suspension will air up without further action.
(2.) Start the coach and press the "Store" button that retracts the jacks, even though they were not extended. The suspension will not inflate until the "Store" button is pressed.

I recently had the suspension fail to air up automatically after starting the engine but I had not extended the jacks on either of the two occasions this has occurred. I am trying to determine if additional action is required to initiate the airing up of the suspension or if there may be a problem that requires further investigation and possible repair.
I think the dump valve may be sticking and when you hit the dump button you cause it to "reset". Have you ever had your air pump serviced and your filter changed? I think this is a very common error by many DP owners.
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Old 11-01-2015, 11:40 PM   #9
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Air suspension operational question

If you are just parking overnight and not using the jacks, why would you dump the air? That doesn't make sense. There is no need to dump the air for an overnight stop.


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Old 11-02-2015, 08:28 AM   #10
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Quote:
Originally Posted by jerichorick View Post
I think the dump valve may be sticking and when you hit the dump button you cause it to "reset". Have you ever had your air pump serviced and your filter changed? I think this is a very common error by many DP owners.
I need to correct myself here. The air dryer is what needs to be serviced. It is not necessary to dump the air as stated above. Makes no difference. Dumping the air when the jacks are deployed is to get the entrance step closer to the ground and to get enough travel out of the jacks to level the coach.

Happy trails,
Rick Y
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Old 11-03-2015, 02:45 PM   #11
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Not everyone has "jacks" on their coach, and it's a good thing, they can stick at very bad times, like a cold night on the Alaska Highway! On my Country Coach the air supply does not come from the engine , it comes from a separate compressor under the coach. Automatic leveling works well, no need to mess with anything.
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Old 11-03-2015, 08:04 PM   #12
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Ron H,
It's your coach, if you want or desire to release the air from the suspension, either over night or, while in short or long time storage, then release it. It's no big deal. Everyone's got their own tactics as far as those operations are concerned. The only thing you were basically concerned about is, whether or not you need to use the "Store" button on your HWH panel, to re-inflate the bags, if and when you started your coach up and, the suspension had been bled.

Well, again I explained the operation to you, if your system is the HWH 625 system. And, also, the parking brake provides an interlock ground system to that HWH system. That's why the HWH system will not function correctly IF, the parking brake is not set.

And, consequently, if the parking brake is released, you've just lost the ground to the electrical side of the jack system and, the protocol is to secure the system so, the bags will fill and, the jacks will retract, as a safety margin.
Scott
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Old 11-05-2015, 12:41 PM   #13
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Quote:
Originally Posted by Ron_H View Post
Scenario:

I park for the night and dump the air out of the suspension using the HWH control panel, but I don't extend the stabilizer jacks.



Question:

Which of the following will cause the suspension to air up in preparation for travel? (Air gauges for breaks still show about 100-120 psi when ready to go.)

(1.) Simply start the coach. The air pressure will build and the suspension will air up without further action.

(2.) Start the coach and press the "Store" button that retracts the jacks, even though they were not extended. The suspension will not inflate until the "Store" button is pressed.



I recently had the suspension fail to air up automatically after starting the engine but I had not extended the jacks on either of the two occasions this has occurred. I am trying to determine if additional action is required to initiate the airing up of the suspension or if there may be a problem that requires further investigation and possible repair.

My HWH system operates as in option #1.


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