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Old 08-02-2020, 12:29 AM   #1
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Bleeding the moisture on a Class A Diesel Pusher

Hello Friends! A quick question? When you bleed the moisture from the air lines on a diesel pusher by pulling the loop wire that is usually somewhere by the front wheels is this done while the engines is running or with the engine off?? Thank You!!
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Old 08-02-2020, 06:11 AM   #2
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Engine off is the normal way.

Watch that the suspension doesn't drop on your body while draining. Use an awning hook or something.
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Old 08-02-2020, 06:16 AM   #3
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Originally Posted by Grandcanyon View Post
Hello Friends! A quick question? When you bleed the moisture from the air lines on a diesel pusher by pulling the loop wire that is usually somewhere by the front wheels is this done while the engines is running or with the engine off?? Thank You!!
I don't think it matters as long as there's pressure in the tanks. But if that's wrong I'd sure want to know why, since I usually bleed them engine off!
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Old 08-02-2020, 05:04 PM   #4
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On my coach, draining moisture from the tanks does not affect the air suspension. The airbags have a solenoid valve that retains the air in each bag until the leveling system calls for a change. Engine running or not makes no difference either. I usually drain the tanks with the engine off only because I have no reason for it to be running.
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Old 08-02-2020, 05:50 PM   #5
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On my coach, draining moisture from the tanks does not affect the air suspension. The airbags have a solenoid valve that retains the air in each bag until the leveling system calls for a change. Engine running or not makes no difference either. I usually drain the tanks with the engine off only because I have no reason for it to be running.
Solenoids are for dumping the suspension before using levelers.

Ride height valves are active all of the time. If there is a leak in the ride height system, the chassis will sink if the system pressures drop below what the bags need to maintain that height.
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Old 08-02-2020, 07:15 PM   #6
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Just remember, there's usually 3 drain valves with loops in the front of the rig.

Sometimes it takes some detective work to find all 3.
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Old 08-02-2020, 07:27 PM   #7
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Assuming your chassis has a properly functioning air dryer (filter) you should not see much, if any, moisture being expelled. Holding each “spitter” open until all the air escapes isn’t necessary. IF there is moisture accumulation in the tank it will be blow out almost immediately because water is heavier than air and the drain should be on the bottom of each tank
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Old 08-02-2020, 07:46 PM   #8
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Solenoids are for dumping the suspension before using levelers.

Ride height valves are active all of the time. If there is a leak in the ride height system, the chassis will sink if the system pressures drop below what the bags need to maintain that height.
My bad...thanks for the correction.
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Old 08-02-2020, 08:41 PM   #9
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Assuming your chassis has a properly functioning air dryer (filter) you should not see much, if any, moisture being expelled. Holding each “spitter” open until all the air escapes isn’t necessary. IF there is moisture accumulation in the tank it will be blow out almost immediately because water is heavier than air and the drain should be on the bottom of each tank
+

Yep,
In the nine years and over 53,000 miles we've put on our '04 Itasca Horizon 36GD with the CAT C-7 330HP, the few times I've actually pulled on those drain cables, which has been oh, maybe a dozen times, has revealed absolutely ZERO water/moisture, EACH and every time. But, that doesn't mean one shouldn't check every now and then, just because you haven't found any water/moisture in years.
Scott
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Old 08-03-2020, 09:49 AM   #10
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edgray is right . ive only changed my dryers once ..
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Old 08-04-2020, 12:34 AM   #11
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Thanks for all of your fast replies!!! I appreciated!!!
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