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Old 10-27-2014, 07:44 AM   #1
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Leaving tranny in gear while parked

Our allison tranny does not have a park position only neutral. Coach has hydraulic brakes with a normal spring parking brake. Occasionally when parking after applying the parking brake with tranny in neutral it will release on its own ( probably because I didn't push hard enough with foot) . So now I use a wheel chock everytime I stop. Just wondering if Ieaving tranny in gear would prevent coach from rolling in the event of the parking brake disengaging.
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Old 10-27-2014, 07:51 AM   #2
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Leaving an automatic in gear won't do anything to hold it back, the torque converter drains and the clutch's need pressure from the pump to engage.

Get the parking brake fixed before you roll into something. You could roll over yourself, while placing the chock!!
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Old 10-27-2014, 08:23 AM   #3
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Quote:
Originally Posted by twinboat View Post
Leaving an automatic in gear won't do anything to hold it back, the torque converter drains and the clutch's need pressure from the pump to engage.

Get the parking brake fixed before you roll into something. You could roll over yourself, while placing the chock!!
Good answer & Good advice
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Old 10-27-2014, 03:45 PM   #4
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Plus Allison recommends not leaving it in gear when
stopped, not even at traffic lights !
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Old 10-27-2014, 03:46 PM   #5
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Im not sure there is a problem with the parking brake as much as the operator not using it properly.. But I agree and thankyou for the
advice. I will make sure the brake is working as it should.
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Old 10-27-2014, 05:18 PM   #6
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Plus Allison recommends not leaving it in gear when
stopped, not even at traffic lights !
So, every time you come to a stop light you're supposed to shift it into neutral? I don't buy that!
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Old 10-27-2014, 05:30 PM   #7
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Plus Allison recommends not leaving it in gear when
stopped, not even at traffic lights !
Can you please post the manual and page number that states that.
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Old 10-27-2014, 05:41 PM   #8
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Automatic trans does not have a solid coupling like manual trans does. The hydraulic coupling of the torque converter would allow slip when engine is not running. Plus the rest of the internal bands and clutch packs inside have no hydraulic pressure to hold them engaged.
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Old 10-27-2014, 05:44 PM   #9
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I drove school buses with Allisons for over 10 yrs and we weren't ever told to put in neutral when stopped,we do now but its a federal suggestion for safety when crossing kids maybe thats whats refered to.
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Old 10-27-2014, 05:51 PM   #10
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So, every time you come to a stop light you're supposed to shift it into neutral? I don't buy that!

Mine will start to get very warm if the lights are long or if it takes multiple lights to get thru the intersection. If I have that kind is situation I also utilize neutral.


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Old 10-27-2014, 07:19 PM   #11
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Page 45 of the Allison automatic transmission operator manual: Use

N(Neutral)for the following:
"To operate the engine at idle for more than 5 minutes".
I do not hesitate to shift into neutral and set parking brakes when expected wait times are 5 minutes or longer. The time to shift back into Drive and release parking brakes is less than 30 seconds.
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Old 10-28-2014, 10:45 AM   #12
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Not many stoplights are 5 minutes...
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Old 10-28-2014, 06:04 PM   #13
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So, every time you come to a stop light you're supposed to shift it into neutral? I don't buy that!
yeah thats what the g solenoid is for in the VB

when at a red light/stoped the TCM sees lower RPMs and cuts line PSI to help MPG and harder idling

this was added in allison 1000 and 2100 in 2004 and was part of there last updates befor going to the newer 6 speeds

not sure when this was added to the 3000 up units
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