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Open Roads Forum  >  Class A Motorhomes

 > Allison Mode Button

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kedanie

Albuquerque, NM

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Posted: 03/01/12 10:00am Link  |  Print  |  Notify Moderator

We are new to this Class A DP. It was purchased "lightly used" and we are still trying to figure out a few things.

The coach has a 340hp Cummins with a Allison 2500 6 speed trans. The trans control has a button marked "Mode". I looked through the manual and couldn't find anything about it. Can anyone tell me what it is supposed to do? The dealer PDI guy said that it makes the trans down shift less.

Any info will help,
Keith


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skipnchar

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Posted: 03/01/12 10:07am Link  |  Print  |  Notify Moderator

Push the button to see what happens. Most likely outcome is it will turn on the "tow/haul" mode, and push it again, to turn it off. Should also light up on the dash to show it's on. Tow/haul will change the shift points to prevent the transmission from shifting as often, thus reducing heat when working hard. Probably also will provide automatic downshifts on long downhill grades to control speed.


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downtheroad

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Posted: 03/01/12 10:18am Link  |  Print  |  Notify Moderator

Whatever you do, DON'T PUSH THAT BUTTON!!




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Deetour

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Posted: 03/01/12 10:22am Link  |  Print  |  Notify Moderator

Big Katuna wrote:

It switches Economy mode on and off. Lowers the ups oft point and raises the downshift point. Wont make much difference on flat land but will downshift less in rolling hills which will save some fuel. No light on dash. A red light comes on by button.
This is the correct answer.

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Posted: 03/01/12 10:22am Link  |  Print  |  Notify Moderator

I just saw an article about this mode button, but only read a little of it because I don't have a diesel engine. I don't know if the article was in the most recent FMCA magazine or a Motorhome magazine. Perhaps someone will know the source of the article.


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Big Katuna

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Posted: 03/01/12 10:13am Link  |  Print  |  Notify Moderator

It switches Economy mode on and off. Lowers the ups oft point and raises the downshift point. Wont make much difference on flat land but will downshift less in rolling hills which will save some fuel. No light on dash. A red light comes on by button.


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polly sue

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Posted: 03/01/12 10:26am Link  |  Print  |  Notify Moderator

The current Motorcoaching Mag of FMCA has the article and I found it pretty informative.

bluwtr49

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Posted: 03/01/12 10:38am Link  |  Print  |  Notify Moderator

skipnchar wrote:

Push the button to see what happens. Most likely outcome is it will turn on the "tow/haul" mode, and push it again, to turn it off. Should also light up on the dash to show it's on. Tow/haul will change the shift points to prevent the transmission from shifting as often, thus reducing heat when working hard. Probably also will provide automatic downshifts on long downhill grades to control speed.


There is no such thing as a tow/haul function on the Allison. This is to shift to an Economy mode that allows the engine to lug longer before downshifting. By running at max torque longer and allowing the speed to drop, fuel efficiency is improved.


Dick

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wolfe10

Texas

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Posted: 03/01/12 10:44am Link  |  Print  |  Notify Moderator

The article is also out on the March 2012 e-Newsletter that just came out today and was e-mailed to all FMCA members who get e-newsletters.

Just click on "Allison Transmission Mode Button" (assuming you are a member of FMCA).


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RCtime

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Posted: 03/01/12 11:12am Link  |  Print  |  Notify Moderator

I use it almost exclusivly. I prefer its shift points.
I cruise about 62-63 mph. with it on, it shifts to 6th about 55 mph, with it off about 58. a little cushion before downshift, It also holds in gear a little longer before down shift when in rolling hills.
Once up to speed on flat terrain there is no difference.
From a stop sign the shift points will come a little quicker.
Just turn it on and try it out.


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