Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 05-10-2022, 07:12 PM   #1
New Member
 
Join Date: May 2022
Posts: 1
MT-643RM Not Shifting

Hi Everyone!

New to the community and appreciate any help.

I have a 1987 Bluebird All American(cat3208, Allison 643) that has been sitting for almost 8 months. I changed the oil, patched up some water leaks and got it running again.

The issue I'm having is before parking it we drove over 2000 miles with no transmission issues, but now that I've turned it back on, it seems to not want to shift into gear. When I put it into any gear I don't even feel it trying to go into gear. Also if I Rev it in gear it doesn't seem to push itself.

I've checked that the cable is working OK, not frozen. Is it possible that it won't shift due to transmission fluid sitting for so long? I can't tell if there's enough in there because I can't drive around, so I don't know if the fluid line isn't showing because there's no movement or because it really is too low.

Also I haven't moved it very far because of how it's parked, I don't want to roll it forward and not be able to roll it back. But if you think I just need to roll it a bit to get the gears moving I can try that too.

I'm new to most of this, so please let me know whatever info you need, or if my explanations need more substance. If be happy to clear things up

I don't have any light/electrical indications on my panel to tell me what gear it's in except for the actual shifter, assuming because it's all mechanical and older

Discreation is offline   Reply With Quote
Old 05-11-2022, 10:05 AM   #2
Bus Crazy
 
ewo1's Avatar
 
Join Date: May 2015
Location: Miami, Fl.
Posts: 1,119
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by Discreation View Post
Hi Everyone!

New to the community and appreciate any help.

I have a 1987 Bluebird All American(cat3208, Allison 643) that has been sitting for almost 8 months. I changed the oil, patched up some water leaks and got it running again.

The issue I'm having is before parking it we drove over 2000 miles with no transmission issues, but now that I've turned it back on, it seems to not want to shift into gear. When I put it into any gear I don't even feel it trying to go into gear. Also if I Rev it in gear it doesn't seem to push itself.

I've checked that the cable is working OK, not frozen. Is it possible that it won't shift due to transmission fluid sitting for so long? I can't tell if there's enough in there because I can't drive around, so I don't know if the fluid line isn't showing because there's no movement or because it really is too low.

Also I haven't moved it very far because of how it's parked, I don't want to roll it forward and not be able to roll it back. But if you think I just need to roll it a bit to get the gears moving I can try that too.

I'm new to most of this, so please let me know whatever info you need, or if my explanations need more substance. If be happy to clear things up

I don't have any light/electrical indications on my panel to tell me what gear it's in except for the actual shifter, assuming because it's all mechanical and older
Allison MT 643 mechanic troubleshooting manual,
-link -> http://manuals.chudov.com/M939-Serie...anics-Tips.pdf
ewo1 is offline   Reply With Quote
Old 05-11-2022, 12:50 PM   #3
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 17,541
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
couple thigns to check.. start it up and while its running check the fluid.. if theres no fluid on the stick you are so low its not able pump, trans fluid levels go down when it cools.. so its possible you drove home and it was hot enough that it made pressure (and has a leak).. once it got cold the level may be so low that it cant make pressure..



if the stick (with engine running) is on full cold then try going into Reverse.. the reverse lights on this trans are pressure-activated.. if when you go into 'R' you dont get reverse lights or beeper (and you previously did).. it very well may mean you arent pumping pressure...



then its time to get a pressure gauge and fittings and hit the book the EW01 sent link to,..



if the fluid is not on the stick at all even with the bus turned off then its definitely too low to operate.. likely blew a seal or dripped out while it was parked..
cadillackid is offline   Reply With Quote
Reply

Tags
allison, allison automatic mt643, cat 3208, skoolie, transmission

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:34 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2023, vBulletin Solutions, Inc.