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Old 07-17-2013, 06:06 PM   #21
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It's because of the spider gears in Diffy. When you turn one rear wheel forward withe the driveshaft held with the Trans mounted parking brake, the other rear wheel will turn backwards. This is why you don't want the rear wheels off the ground on any hill. Actually, any time.
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Old 07-17-2013, 06:37 PM   #22
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Lostdog/Kittyskeeper, thanks for the explanation. Your theory is sound;however, my unit does experience during leveling, times when just one of the rear wheels maybe slightly off the ground. I spoke with an engineer at Lippert and he advised that the system was designed to operate in those conditions. He did say that you never want BOTH rear wheels off the ground, but one is acceptable. In most cases if I have an off the ground wheel condition it is the front.
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Old 07-17-2013, 07:22 PM   #23
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If one wheel is off the ground and the MH is on a hill, the MH will go down hill in a circle even with the park brake on.
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Old 07-17-2013, 07:41 PM   #24
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If one wheel is off the ground and the MH is on a hill, the MH will go down hill in a circle even with the park brake on.
LOL. Well that is something I would never want to see. I never park on a hill. My issues have all been on fairly level commercial camping sites such as Yogi Bear. But again I have had sites where one of the rear wheels was off the ground. But the coach was completely level.
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Old 07-18-2013, 08:38 AM   #25
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When you deploy your four point levellers the weight of the chassis is transferred from the wheels, tires ( both front and rear) to the leveller pads which are flat discs. If one or more tire is elevated off the ground to achieve level then what's the big deal? As far as the chassis is concerned level is level, tires do not play a part. True, if you level on the side of a mountain the MH might slide down the hill and possibly bend the levellers but it will not initially roll down the hill. If levelled on very soft ground the leveller pads might dig in but this movement is down not fore or aft and now the leveller pads actually act as anchors restricting all movement, including powered movement if attempted. I'm done.
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Old 07-18-2013, 09:00 AM   #26
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Bubbles is correct for leveling jacks. I was explaining the process of the differential in relation the the transmission mounted parking brake. GM never, as long as I can remember, has had that type of parking brake. They have always locked both rear wheels for jacking and tire removal. Best to read the Ford owners manual in tire changing.
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Old 07-18-2013, 10:13 AM   #27
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When you deploy your four point levellers the weight of the chassis is transferred from the wheels, tires ( both front and rear) to the leveller pads which are flat discs. If one or more tire is elevated off the ground to achieve level then what's the big deal? As far as the chassis is concerned level is level, tires do not play a part...
I gave this a lot of thought before making up wooden blocks to put the tires on (for the purpose of "rough-leveling" the coach before deploying the jacks).

I think you are asking "what's the point of leveling the coach with blocks, if you have leveling jacks"? Sorry if I didn't make it clear the first time, but you have to get the coach within about 1.0 to 1.5 degrees of level in order to not get an "excess slope" response from the leveler. And that is after you have done a successful null reset. And don't forget, you want the same number of boards under the jacks as are under the adjacent wheel(s).
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Old 07-18-2013, 10:40 AM   #28
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I gave this a lot of thought before making up wooden blocks to put the tires on (for the purpose of "rough-leveling" the coach before deploying the jacks).

I think you are asking "what's the point of leveling the coach with blocks, if you have leveling jacks"? Sorry if I didn't make it clear the first time, but you have to get the coach within about 1.0 to 1.5 degrees of level in order to not get an "excess slope" response from the leveler. And that is after you have done a successful null reset. And don't forget, you want the same number of boards under the jacks as are under the adjacent wheel(s).
I have never used blocks nor have I ever received an excessive slope response from the leveler. My unit levels perfectly, even without ever doing a null reset;however, in some cases my wheels still come off the ground. Which after all this research appears to be OK.
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Old 07-22-2013, 07:51 AM   #29
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Level problem also

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OK, so I was at the dealer the other day and observed a customer bring in a 2014 GT XL. His frame was bent and you could easily see that his rear leveling jacks were also bent. After hearing the story it appeared to me that this was a user error; however, it prompted another discussion. The service manager brought up that the GT series should never lift the wheels off the ground when leveling. I advised that on several occasions, even on a level camp site, my unit lifts one or two wheels off the ground. The service advisor advised that the jacks were not made to support the weight of the unit and will bend the frame. I called Lippert, and they said, while it is not what they would want, it is OK for the unit to lift off the ground to creat a level environment. What do you guys think?
We also had a problem with our 2013 Georgetown XL..ours lifted too much on a pretty level spot..it would not then retract. Called for help as we were way off the ground. (Problem solved).. Popped a breaker..this is safety feature so as not to burn up the motor for the leveling system..located under step. Then we found a good level spot and manually leveled it and went thru the ZERO set procedure . We are good now. Sometimes we think we are leveled too high so we will manually set it.
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Old 07-22-2013, 10:06 AM   #30
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The easy way to level. Buy an inexpensive pair of bubbles, install them next to your controls and level manually. Perfect results every time with wheels on ground.
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