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Old 05-22-2019, 02:28 PM   #1
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Air Suspension - Lesson Learned

So, we packed up the 40C XL and pulled it down to the RV Resort Parking lot to hook up the toad. On giving the rig a careful look over.... it was noticed rig was low... the air suspension did not inflate.. (Leveling jacks were up)



..... Got on the phone with Freightliner.. Very nice... Received a call back from the Tech...



Turn off the rig. Auto level the Rig again.... Raise the leveling jacks.



Re-Start the rig....And the Rig raised


-g
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Old 05-22-2019, 04:07 PM   #2
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The "pogo stick ride".

Don't even need to do all that. The leveler system is installed by the body builder and Freightliner is not that familiar with how it ties in.

Just turn on the auto leveler power and hit "All Retract". This sends a 2 minute 12V signal to the suspension dump valve to let the air back in.

It is important to start the engine and build air BEFORE you retract the levelers. When there is no air and the dump valve does its 2 minute thing.... there's no air so it can't come up..
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Old 05-22-2019, 04:42 PM   #3
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THANKS



Well THAT does explain it.....


... I did not have the rig running when I retracted the jacks because the auto leveler complains when I have the ignition on.
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Old 05-22-2019, 06:08 PM   #4
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Mine stops complaining after about 20 seconds ......
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Old 05-22-2019, 07:21 PM   #5
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We always start the engine before raising the jacks. Yep the levelers buzzs for about 20 seconds.
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Old 05-22-2019, 08:20 PM   #6
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If you've leveled and sat a week and the air pressure is low the levelers quit yelling well before the air low pressure warning goes out.
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Old 05-23-2019, 09:05 AM   #7
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And sometimes I have to hit the all retract button twice to have it raise, but always have it running and the air built beforehand. I always do the visual and fist-between-the-tire-and-fender test before moving the rig.
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Old 05-23-2019, 10:25 AM   #8
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Quote:
Originally Posted by Igave View Post
I always do the visual and fist-between-the-tire-and-fender test before moving the rig.
That and get down and verify the legs are UP. We do not have limit switches on our hydraulic legs. The pump runs until the pressure changes (builds up) and then it ASSUMES the legs are up, runs a few seconds more and stops. You can hear it happening, listen next time you do it. However, sometimes the legs can be a little sticky and the pressure builds even though the leg is NOT all the way up. I've had it happen a few times. Move it down a little and hit retract again and it takes care of it.

You HAVE to look.
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Old 05-23-2019, 09:29 PM   #9
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Exactly as Oscarvan described. Thanks OV for your perfect explanation.

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Old 05-25-2019, 10:00 AM   #10
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Exactly! Can't be stressed enough. Start the engine, wait for full air pressure, retract the jacks. WAIT for full air pressure, retract the jacks again. THEN, get OUT and LOOK! Bend down and ensure all jacks are UP and all 4 corners of the coach are UP.
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