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Old 03-31-2021, 09:09 AM   #1
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Move coach with bags dumped?

2003 Newmar HWH air bag leveling. I need to lower the coach by a few inches to get it into my shop. Can I dump the bags, bypass refill and drive coach into shop?
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Old 03-31-2021, 09:26 AM   #2
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I know you can dump the air, and have clearance between the tires and the body. However, you do not have enough clearance to steer much.
Secondly, I am pretty sure if the bags are empty when you start the engine it immediately begins the process of inflating the bags.

Do a little home work......1. dump the air leave the engine off and take a flashlight and look at the wheel clearances. 2a. With the air dumped and engine off take a tape measure and measure ground to wheel well edge. Start the engine, let it run two minutes and make the same measurement . 2b. After the two minute engine run hit the dump button and listen for the air exhaust.

FWIW, I needed to do a quick blackout from my storage building. Just start the engine and back straight out. No big deal. At the transition from cement to gravel I had a slight depression. When I backed out (bags not fully inflated, I drug the nose fiberglass on the concrete.
So, if you try it make sure your driving surfaces a perfect level
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Old 03-31-2021, 08:15 PM   #3
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I would say yes but no turns and move as soon as you start motor, as said bags will start to fill.
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Old 03-31-2021, 10:26 PM   #4
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The most important thing is the change in driveshaft angle when air springs are deflated. I once had a ride-height rubber connector break on the rear, air springs deflated and the coach began jumping up/down quickly. I slowed to approx. 10 MPH and the jumping stopped.
I got off the interstate and called a nearby Pilot station, I slowly drove to them, they replaced the rubber linkage end and told me they inspected the driveshaft,U-joints, and diff and trans yokes, no apparent damage but if I had not slowed quickly the driveshaft and yokes would have been severely damaged.
Bottom line if you decide to do this move in a straight line veery slowly.
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Old 04-01-2021, 11:18 AM   #5
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Originally Posted by Ray,IN View Post
The most important thing is the change in driveshaft angle when air springs are deflated. I once had a ride-height rubber connector break on the rear, air springs deflated and the coach began jumping up/down quickly. I slowed to approx. 10 MPH and the jumping stopped.
I got off the interstate and called a nearby Pilot station, I slowly drove to them, they replaced the rubber linkage end and told me they inspected the driveshaft,U-joints, and diff and trans yokes, no apparent damage but if I had not slowed quickly the driveshaft and yokes would have been severely damaged.
Bottom line if you decide to do this move in a straight line veery slowly.
YUP!
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Old 04-01-2021, 11:24 AM   #6
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Good point, I never thought about drive shaft angle.
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Old 04-01-2021, 11:46 AM   #7
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Good point, I never thought about drive shaft angle.
For the distance and speed involved this is not a problem.
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Old 04-01-2021, 11:51 AM   #8
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Originally Posted by mn.roadking View Post
2003 Newmar HWH air bag leveling. I need to lower the coach by a few inches to get it into my shop. Can I dump the bags, bypass refill and drive coach into shop?
You should be able to do so for a short distance if your system allows. I had something similar. I have a transition when I back my coach out from my side year down the 15 foot driveway to the street. At the end of my driveway there is a hump as it connects to the street and my trailer hitch would bottom out. Instead of getting out or having my son bring wood over, I installed two air solenoids and a switch in my dash. When I get to the area of my driveway just before it starts dragging, I hold the switch in the up position and the air bags raise aprox 3 inches up, just enough for me to back down another 6 feet+- and clear the hump. When I let off the dash button switch, the air bags go back to their normal operation. If your coach doesn't allow the bags to air down while engine is running, you could do the exact opposite of what I did with air solenoids.
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Old 04-01-2021, 12:17 PM   #9
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You can get a little bit by letting the air down in your tires. Just depends how much lower you need to be.
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Old 04-01-2021, 12:26 PM   #10
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I know you can dump the air, and have clearance between the tires and the body. However, you do not have enough clearance to steer much.
Secondly, I am pretty sure if the bags are empty when you start the engine it immediately begins the process of inflating the bags.

Do a little home work......1. dump the air leave the engine off and take a flashlight and look at the wheel clearances. 2a. With the air dumped and engine off take a tape measure and measure ground to wheel well edge. Start the engine, let it run two minutes and make the same measurement . 2b. After the two minute engine run hit the dump button and listen for the air exhaust.

FWIW, I needed to do a quick blackout from my storage building. Just start the engine and back straight out. No big deal. At the transition from cement to gravel I had a slight depression. When I backed out (bags not fully inflated, I drug the nose fiberglass on the concrete.
So, if you try it make sure your driving surfaces a perfect level
The bags should not fill when you start the engine if the dump button is pushed, but I believe as soon as you release the park brake and put in gear they do air up.

I understand why you want to, but personally I would not risk taking the top off.

PS: I love my basement ac for the extra inches it gives. I can get it in a 12 door
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