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Old 11-27-2020, 04:59 PM   #1
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Suspension Air Leak

When I retract my jacks, it appears as if I have an air leak (loud whistling sound). If I shut down the engine the leak continues. If I lower and raise the jacks again, all is well. Does the air leak in the video sound like a sticking dump valve? My RV is a 2020 Winnebago Forza on an XSC chassis. It is a random problem. Freightliner says it has to be leaking when I bring it in, otherwise they cannot help me.

https://youtu.be/x674hlEbdYM
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Old 11-27-2020, 07:17 PM   #2
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Could you post the sequence your using .

I raise the jacks ; before starting the engine ; if you're starting the engine , before raising the jacks , what you're hearing could be the ride height valves being open and trying to bring the suspension DOWN while the jacks are still holding the suspension up.
Causing all air supplied to the suspension to vent through the ride height valves, and that venting would continue until the brake protection valve shuts off suspension air supply at approx 65 psi.

EDIT: If the jacks are deployed and haven't raised the suspension above ride height , you would not get the sound , and that could be why you say the issue is random.
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Old 11-28-2020, 09:48 AM   #3
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Air Leak

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The Power Gear control panel is labeled "ENGINE RUNNING required for leveling".

Here is the sequence recommended by Power Gear for retracting all jacks:
1. Turn on the ignition and start the coach.
2. Turn on the system by pushing the “On/Off” button. The system is now operational and the “On/Off” LED will turn on.
3. Push the “RETRACT-ALL JACKS” button. When the “JACKS DOWN” light turns off, visually check to make sure that all jacks have fully retracted. If so, your coach leveling system is ready to travel.

This is what the first part of the video shows. When the the suspension is aired up the air leak continues, even when the engine is shut down. If I extend the jacks and retract them a second time there is no leak.
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Old 11-28-2020, 12:35 PM   #4
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Thanks , for posting your leveling system manufacturer and the retraction sequence as per your owners manual .

I'd say you might have an issue , but need to consider , who installed the leveling system , Freightliner or Winnebago , before you make an appointment to have it looked at .
Freightliner probably wouldn't want to deal with the system if, Winnebago installed it.
Particularly as a warranty claim.
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Old 11-28-2020, 05:33 PM   #5
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Air Leak

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It worked OK today. We are in Newport OR on our way home to Peoria AZ. Freightliner has taken responsibility for fixing the issue. In these times of COVID, Freightliner wants you out of he RV for 3 hours before they will look at it, and needs to have it leaking. I think I can make it home OK. Nice to have that 12 month warranty for peace of mind.
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Old 11-30-2020, 11:42 AM   #6
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I think there are issues with the dump valve not sealing perfectly in all instances.

Frieghtliner already replaced mine once but still leaks down over night to 4 days depending on how it sealed the last time I used it.
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