Is my transmission toast?

[robertglines1]

how far was it down? transmission wireplug wet-speed sensors in rear differential-air line tore loose? Good luck.

[H3Jim]

the far rear was down far, trailer hitch about 4" in the dirt.  I don't think the differential was even close to hitting.

Attached, I hope, is a picture

[H3Jim]

Talked to the free emergency tech at Prevost.

He confirmed that its not likely that the reset would work as the computer seems to be working - iot does shift into 1st gear.

I checked for codes and there are no codes.

He said the next thing to try is to carefully clean the battery posts for the 12 volt circuit - even though the bus starts (on 24 volts) if the 12 volt batteries have corrosion or are not fully charged, it can make the tranny computer go crazy.

He said that if that does not work, it needs to get itself to a shop.

[Busted Knuckle]

Talked to the free emergency tech at Prevost.
He said that if that does not work, it needs to get itself to a shop.

Great news! Did he mention a FREE way for it to get itself to a shop?
  BK 

[rv_safetyman]

Jim, I have to wonder out loud if the parking brake and transmission are related.  The DDEC has a signal from the parking brake.  It, for example, will not go to high idle unless the parking brake is on.  The engine talks to the transmission and I wonder if there is an interlock that keeps it from going into reverse until the parking brake is released.  That is a long shot.  You would think that there would be an interlock on the forward gears as well, but these computers have strange algorithms.

Jim

[robertglines1]

Have had A  bad battery screw ddec up. So prevost might have something. Could be a corroded terminal-fuse holder or loose connection. Do you have the 4 group 31 battery-thats what I had and one was bad when load tested.

[Don Fairchild]

Jim;

After you get all the batts checked out build air so you can get under the bus. With the batts disconnected unplug all the conectors from the trans. Clean them good and put some dielectric greese on them and plug them back in. If that does not work take it out for a drive and see if you have a shift flairup in third or fourth gear. (engine rpm will go up but the bus will not pick up speed). Hope thats not it.

It may be a solinoid, but it should give you a code.

Bob ware as clifford suggested is a good source, we used to share ideas when I was building allisons at Delaney & Ahlf way back when. You might give dartco a call. I think their is a out let in orange county.


Hope that helps

Don

[luvrbus]

Jim, I spoke with Bob he said he thought Prevost used the output function relays on that bus he said check wires 112,114,125 and 132 see if you have relays on those wires one controls the reverse function and there should be a 15 amp fuse to supply power to the relays hope this helps


good luck   

[Ace]

It could be a simple tripped breaker. Has that happen on mine.

[rv_safetyman]

Jim, any resolution yet?

I was thinking about this yesterday and wonder if being stuck in the mud might have dislodged one of the connections.

Jim

[Busted Knuckle]

Just curious if we ever found out the problem here?
  BK 

[dougyes]

Regarding the parking brake issue. Ours was sticking. Replaced a diaphragm and it's good to go.
Was the tranny issue solved?

[rv_safetyman]

I wrote to Jim off-line and he said that he is bogged down by a bunch of other projects and it could be a month or two before he gets back to the bus.

Jim

[Busted Knuckle]

I wrote to Jim off-line and he said that he is bogged down by a bunch of other projects and it could be a month or two before he gets back to the bus.

Jim

Thanx Jim. I was just curious.
  BK 

[artvonne]

  Man, thats like reading a really interesting story in a magazine, and half way through it says "continued in next months issue".

  In all seriousness though, is this transmission really $25K? Why so expensive??