Jacking issue while rotating tires with QuadraLift - Jeep Garage - Jeep Forum

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  #1  
Old 08-22-2015, 09:31 PM
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Jacking issue while rotating tires with QuadraLift

This evening I was planning to rotate my tires on my 2014 Summit w/ QuadraLift using the same method that worked in the past.

First, I secured my Jeep on my level concrete floor garage using chocks, set the parking brake, and set Tire/Jack Mode. Then, I used a floor jack on the rear cross member (not the pumpkin) in order to elevate the back end of the Jeep in order to place a jack stand at the rear jack points. This allows me to remove a rear wheel and proceed with my rearward cross pattern.

Uh, so unlike previously, the rear tires failed to elevate while jacking. That is to say, despite being in triple-confirmed Tire/Jack Mode, QL continued to allow the rear suspension to deflect as the rear end of the Jeep jacked up.

In the past, the jack would elevate the rear of the vehicle with both tires in the air while it was in Tire/Jack mode. The jack has not failed... it continues to lift the rear of the vehicle by 18.5", the difference this time being the deflection of the suspension.

I had various TSBs applied a few months ago, and I am wondering if they have affected the operation of QL in Tire/Jack mode. Has anyone else experienced this?

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  #2  
Old 08-22-2015, 09:49 PM
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Re: Jacking issue while rotating tires with QuadraLift

just yesterday I pulled the rims one @ a time, w/ quad lift.... didn't even know there was a procedure??
anyway, jacked up one corner at a time and had no issues.... was I supposed to disable something?
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Old 08-22-2015, 09:53 PM
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Re: Jacking issue while rotating tires with QuadraLift

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Originally Posted by Da Jeeper View Post
anyway, jacked up one corner at a time and had no issues.... was I supposed to disable something?
Quoth the manual:
Tire/Jack Mode
To assist with changing a spare tire, the air suspension system has a feature which allows the automatic leveling to be disabled. Refer to "Uconnect® Access Settings" in "Understanding Your Instrument Panel" for further information.
NOTE: This mode is intended to be enabled with engine running.
The approach I described in the OP allows the use of a single jack plus a jack stand to effect tire rotation, which implicitly has two or more tires removed at once unless one is using a five wheel rotation. Jacking at the rear cross member (not the pumpkin!), albeit officially proscribed, allows the jack stand to be placed at the Approved Jack Location for the rear.

From my perspective, Tire/Jack mode is no longer working as described in the manual. It used to do so—allowing the entire rear of the vehicle to be jacked without having the suspension compensate.
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Old 08-23-2015, 08:32 AM
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Re: Jacking issue while rotating tires with QuadraLift

I think tire jack mode turns off auto leveling. You are still going to have slack in the air suspension.
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Old 08-23-2015, 09:54 AM
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Re: Jacking issue while rotating tires with QuadraLift

Quote:
Originally Posted by Roadkill View Post
This evening I was planning to rotate my tires on my 2014 Summit w/ QuadraLift using the same method that worked in the past.

First, I secured my Jeep on my level concrete floor garage using chocks, set the parking brake, and set Tire/Jack Mode. Then, I used a floor jack on the rear cross member (not the pumpkin) in order to elevate the back end of the Jeep in order to place a jack stand at the rear jack points. This allows me to remove a rear wheel and proceed with my rearward cross pattern.

Uh, so unlike previously, the rear tires failed to elevate while jacking. That is to say, despite being in triple-confirmed Tire/Jack Mode, QL continued to allow the rear suspension to deflect as the rear end of the Jeep jacked up.

In the past, the jack would elevate the rear of the vehicle with both tires in the air while it was in Tire/Jack mode. The jack has not failed... it continues to lift the rear of the vehicle by 18.5", the difference this time being the deflection of the suspension.

I had various TSBs applied a few months ago, and I am wondering if they have affected the operation of QL in Tire/Jack mode. Has anyone else experienced this?
Can you take a pic of where you are jacking the vehicle up from? When you say "pumpkin" is that the rear diff.? Sorry, I've only had my 2014 JGC for 1.5 years so I'm new to the lingo. I've only go 5065 miles on my JGC and I want to do a tire rotation. For my 4x4 vehicles I like to do the "rears to the front, and the fronts to the opposite side rear" rotation. And the jack stands I use for my Tahoe (Y shaped) will not work well with my JGC, I think. But I don't want to have to buy like 4 bottle jacks, either! lol! I don't like giving my money to the dealer, especially for a tire rotation! loL!
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Old 08-23-2015, 11:35 AM
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Re: Jacking issue while rotating tires with QuadraLift

Quote:
Originally Posted by TypeRod View Post
Can you take a pic of where you are jacking the vehicle up from? When you say "pumpkin" is that the rear diff.? Sorry, I've only had my 2014 JGC for 1.5 years so I'm new to the lingo. I've only go 5065 miles on my JGC and I want to do a tire rotation. For my 4x4 vehicles I like to do the "rears to the front, and the fronts to the opposite side rear" rotation. And the jack stands I use for my Tahoe (Y shaped) will not work well with my JGC, I think. But I don't want to have to buy like 4 bottle jacks, either! lol! I don't like giving my money to the dealer, especially for a tire rotation! loL!
Sorry I don't have a pic to post as I'm at work, but that is correct pumpkin is the rear gears which you probably don't want to jack from. There is a cross member that is a good spot and it's nice because it lifts the truck evenly so both wheels can be removed at once.
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Old 08-23-2015, 01:03 PM
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Re: Jacking issue while rotating tires with QuadraLift

Quote:
Originally Posted by howiestt View Post
I think tire jack mode turns off auto leveling. You are still going to have slack in the air suspension.
Oddly enough, jacking at the jack points (with Tire/Jack mode enabled) will allow the wheel to be elevated without suspension deflection. This time I ended up jacking the rear up using the cross member, placing jack stands bilaterally in the rear at the Approved Jack Points, and then jacking up the lower control arm in the rear on each side in order to temporarily elevate the wheel.

Quote:
Originally Posted by TypeRod View Post
Can you take a pic of where you are jacking the vehicle up from? When you say "pumpkin" is that the rear diff.?
Yes, the pumpkin is the colloquial term for the rear diff. We can't jack by the rear diff/pumpkin without risking damage to it. However, immediately posterior to the rear diff is a rather obvious crossmember. If you look under your vehicle I am guessing it will be apparent: rear diff, then cross member, then fuel tank. It's fairly easy to identify because it requires a bit of care to get the jack that close to the rear diff as it elevates, in order to engage the rear cross member.

Quote:
I've only had my 2014 JGC for 1.5 years so I'm new to the lingo. I've only go 5065 miles on my JGC and I want to do a tire rotation.
Just as a sanity check, the deflection issue I describe is only applicable if you have the QuadraLift air suspension.

Quote:
For my 4x4 vehicles I like to do the "rears to the front, and the fronts to the opposite side rear" rotation. And the jack stands I use for my Tahoe (Y shaped) will not work well with my JGC, I think.
Yes, I use a rotation pattern like that. My jack stands have a U shape in the support, and that fits nicely in the rear jack point on each side (look for the arrow/triangles in the body plastic as hints to where they are). As for the front, the jack point is the unibody weld (ugh). I just use the jack to support it there while pulling the wheel. I'd find a way to further stabilize if I were planning to go under the vehicle.

Overall, this putative change in the behavior of QuadraLift Tire/Jack mode has made the tire rotation a bit more difficult: it now requires three more jacking maneuvers (rear LCAs).
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