Allison v730 will not shift out of first

Winging it · January 06, 2020, 04:43:38 PM

Hi I have a 1969 PD 4107 8v 71 Allison 3 speed toggle switch shift.
I was coming out of Kingman to Havasu. on the way down the hill after the crest, the the bus would not shift out of first. I pulled over, and pulled the governor out, it seemed to operate . I cleaned it and I got it to shift to drive on the frontage road but once it down shifted and I got back on the highway it never shifted out of first gear again. any ideas? Thank you, Mike Sarah and Alex

buswarrior · January 06, 2020, 07:32:02 PM

Confirm that the electric shift mechanism isn't throwing all the way to 1st and holding it there?

Might be doing exactly what it is being told to do?

Happy coaching!
Buswarrior

Winging it · January 06, 2020, 07:49:52 PM

Thank you. I did check while my wife shifted. It is cycling through the gears.

luvrbus · January 06, 2020, 08:16:19 PM

If the fluid is low on the v730 it will not shift out of 1 gear check the fluid first

Winging it · January 07, 2020, 08:58:37 AM

Hi, thank you. I did check the fluid level. It reads right around the correct level when checked cold. And before start it is up in the fill tube some.
I have ordered a new internal filter plus an external spin on filter. I read somewhere that plugged fuel filters could also be a culprit. although I can start it anytime to go empty the waste and fill the propane. It just stays in first.

Bill Gerrie · January 07, 2020, 12:44:15 PM

The proper way to check a V730 is oil warm and idle at 600 to 900 rpm. The cold check is just to make sure the level is safe to start it up.

Winging it · January 07, 2020, 01:13:40 PM

I checked it running and warmed up. It shows correct level of fluid.

Geoff · January 08, 2020, 09:32:18 AM

Dipsticks can be wrong. The bus must be level, or it could be the wrong one. I would add one gallon of tranny fluid and see if it shifts. And I don't think your problem is first to second, but second to third.

There is a second to third shift inhibitor which comes on if you are one gallon low, maybe it is bad.

Winging it · January 08, 2020, 10:02:55 AM

Thank you, I will do it.
I kept the RPMs around 1800 and did an average of 25 miles an hour from Kingman to Havasu.

luvrbus · January 08, 2020, 10:27:15 AM

Close to the drive shaft flange there is a plate with 4 bolts inside the cover is the governor if the plastic gears have broken it is not going to shift to 3rd gear

Winging it · January 08, 2020, 11:03:49 AM

I did remove the governor. It looks great, I cleaned it and the bus did shift through all gears until the first time I had to stop. It then went back to not shifting. I even pulled off of the next exit and pulled it out again. I had no results that time.

luvrbus · January 08, 2020, 12:07:40 PM

You didn't pull the modulator out and loose the pin ?

Winging it · January 08, 2020, 12:53:12 PM

Well I do not think so. It came out pretty straight forward. I can not remember seeing anything like pin.

luvrbus · January 08, 2020, 01:31:56 PM

Quote from: Winging it on January 08, 2020, 12:53:12 PM
Well I do not think so. It came out pretty straight forward. I can not remember seeing anything like pin.

You need to pull it and check for the pin they fall into the pan,lol every old Allison always have a few extra pins in the pan BTDT

Winging it · January 08, 2020, 01:34:23 PM

All right, I have been looking for videos of where the modulator is. can you tell me where it's located? I will do it right away.