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Old 10-06-2015, 09:05 AM   #1
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Alison 1000 park prawl

Hi folks, had very scary experience with my rig the other day. The park prawl may not hold when on 'uneven' ground (I.e. small incline or decline ..... Hill).
Be sure to always chock your wheels!

Even on flat when ground!

Be safe!

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Old 10-06-2015, 11:41 AM   #2
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I'm guessing your problem was that the Park Pawl did not fully engage, since the only way for it to actually fail would be to break it off, and that is one very robust piece of metal.

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Old 10-06-2015, 03:12 PM   #3
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I believe my parking brake locks the rear axel, not any of the wheels. Lifting the rear wheels off the ground can set things in motion.......
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Old 10-06-2015, 03:30 PM   #4
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Agree with Gary, sounds like it was not fully engaged. Check shifter adjustment. Also guess it is obvious, but using the parking brake is really for this purpose to use in combination with Park position on trans.

Just as a comment, the larger Allison applications (2000 series and up) do not have a Park pawl, those you must use parking brake.
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Old 10-07-2015, 01:03 AM   #5
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Originally Posted by Rocky Larson View Post
I believe my parking brake locks the rear axel, not any of the wheels. Lifting the rear wheels off the ground can set things in motion.......
my parking brake is on the driveshaft just behind the ally tranny.
you loose braking capability if even 1 rear wheel is off the ground.
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Old 10-07-2015, 06:55 AM   #6
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Pretty much agree with all the replies... Even the user guide states that the prawl my not work if "uneven". I did not fully understand what that meant, but over the years I have experienced the problem when stopped on slight incline (I.e. to hook up the tow car).
This last incident was very strange:
I had put blocks down to roll the front tires on for leveling purposes. I know the prawl engaged at that time as I felt it when the rig moved forward just a slight bit. The park brack on as well.
When I retracted the jacks for departure, the rig started rolling forward. As I was jumping into position I pulled the park brake for help until I could get my feet to the brake pedal (seat is all the way forward against steering column, park brake is just drive line type, not much help), the park brake was in fact on. Fortunately, I was able to get the brake peddle down and stop the rig, no harm done.

Again, rereading the users guide, it eludes to the fact the prawl can loose engagement. Not sure how unless it does not have enough bite into the prawl position.

I do not see any indication of an adjustment capability.

Thanks for all the input!

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