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 06-01-2019, 06:47 PM   #1
Skoolie
 
WARGEAR's Avatar
 
Join Date: Mar 2018
Location: Fingerlakes region NY
Posts: 204
Year: 1999
Coachwork: AmTran/Wolfington
Chassis: 3800
Engine: International DT466E 190HP variant
Rated Cap: 72 pax 29500 GVWR
AT545 Shift Modulator Adjustment

Good evening all,

I want to ensure the shift modulator/cable is correctly adjusted in my AT545 mated to DT466E. I find the transmission shifts earlier than it should at all throttle positions and doesnít kick down reliably.

What is the correct procedure to adjust the modulator on the transmission? Is it like a TV cable on older cars where you tighten it past max and then floor the accelerator until it self-adjusts? There isnít a cable from the pedal to the trans on this bus so I assume the cable goes elsewhere.

Any helpful thoughts would be welcome!

Thanks!
-Nick

WARGEAR is offline   Reply With Quote
Old 06-01-2019, 07:28 PM   #2
Mini-Skoolie
 
Join Date: Oct 2015
Location: TN.
Posts: 52
Year: 1997
Coachwork: Thomas
Chassis: B8000
Engine: 5.9 Cummins
Rated Cap: 24
Id like to hear more about this subject
reedy is offline   Reply With Quote
Old 06-01-2019, 08:25 PM   #3
Bus Crazy
 
2kool4skool's Avatar
 
Join Date: Oct 2015
Location: Spring Valley AZ
Posts: 1,343
Year: 2000
Coachwork: Bluebird
Engine: 5.9 Cummins
Rated Cap: 2 elderly children, 1 cat
PG 34. http://www.waghornswood.net.nz/Manua...nsmissions.pdf
__________________
Don, Mary and Spooky the cat.
2kool4skool is offline   Reply With Quote
Old 06-01-2019, 08:29 PM   #4
Skoolie
 
WARGEAR's Avatar
 
Join Date: Mar 2018
Location: Fingerlakes region NY
Posts: 204
Year: 1999
Coachwork: AmTran/Wolfington
Chassis: 3800
Engine: International DT466E 190HP variant
Rated Cap: 72 pax 29500 GVWR
Thank you for that TM. I have the Allison Transmission Operators manual and my work has Allison DOC, but I havenít had this one before. Thanks again.
WARGEAR is offline   Reply With Quote
Old 06-01-2019, 09:37 PM   #5
Mini-Skoolie
 
Join Date: Jan 2017
Posts: 25
I had shift issues on my dt466e with an AT545

See if the info I posted under the thread “Gas pedal error code hell” is any use. My dodgy shifting was all fixed by a ECM re-flash. That was easier than it sounded since all I had to do was take the ECM and take it to my local international shop.
Douggy is offline   Reply With Quote
Old 06-04-2019, 09:01 AM   #6
Bus Geek
 
Join Date: May 2014
Location: West Ohio
Posts: 3,715
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
If you have a dt466e, the throttle pedal is electronic and you will therefore have no cable modulator.

I'd have to look it up to be sure, but I think your modulator would be an electronic solenoid on the side of the transmission, controlled by a relay switch which is controlled by the computer.

Your modulator is essentially nothing more then a wide open throttle indicator to the transmission. These routinely fail, either due to the relay or wiring. Which will give soft shifts and no kickdown. This, over time, will ruin your transmission.

Cadillackid had his fail in his bus and it ruined the transmission. He had a t444e but it should be the same principle. Hopefully he chimes in or you can pm him for more details.
Booyah45828 is offline   Reply With Quote
Old 06-04-2019, 09:08 AM   #7
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
I hope Chris comes back to the site. He'd be able to tell us all about it.
EastCoastCB is offline   Reply With Quote
Old 06-04-2019, 09:28 AM   #8
Skoolie
 
WARGEAR's Avatar
 
Join Date: Mar 2018
Location: Fingerlakes region NY
Posts: 204
Year: 1999
Coachwork: AmTran/Wolfington
Chassis: 3800
Engine: International DT466E 190HP variant
Rated Cap: 72 pax 29500 GVWR
I recalled the fact that my AT545 wouldn’t have a cable operated modulator just a moment or two after I posted this haha. Having the DT466E and not the DT466 I should’ve remember before posting.

That being said, can I just call up a quality diesel parts supplier and order a modulator to replace mine or keep as a spare?
WARGEAR is offline   Reply With Quote
Old 06-04-2019, 09:31 AM   #9
Bus Geek
 
Join Date: May 2014
Location: West Ohio
Posts: 3,715
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Um, you can call any allison transmission shop and get the part or at least the # from them.

But you don't know why your's has failed, or even if your's has failed. So you should probably do some diagnostics first.
Booyah45828 is offline   Reply With Quote
Old 06-04-2019, 10:51 AM   #10
Bus Geek
 
o1marc's Avatar
 
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
Quote:
Originally Posted by EastCoastCB View Post
I hope Chris comes back to the site. He'd be able to tell us all about it.
He hasn't even been back to answer my PM to him. I hope the douche didn't run him off, that would be a great loss.
o1marc is offline   Reply With Quote
Old 06-04-2019, 11:46 AM   #11
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
I'll text him today.
EastCoastCB is offline   Reply With Quote
Old 06-04-2019, 11:49 AM   #12
Bus Crazy
 
HazMatt's Avatar
 
Join Date: Oct 2017
Location: E Central Tejas
Posts: 2,094
Year: 1998
Coachwork: Thomas
Chassis: IH 3800, 8 window
Engine: T444E w/ Spicer 5-speed MT
Rated Cap: I prefer broad-brims hats
Me 2.
+ 6 #s.
__________________
Those who say that it cannot be done should not interrupt the people doing it.
HazMatt is offline   Reply With Quote
Old 12-11-2022, 02:06 PM   #13
New Member
 
Join Date: Dec 2022
Posts: 1
have a 1990 dt466 with a 4 speed automatic . an it wont kick down ,i read on here somewhere re someone explained how to adjust the kickdown cable ,an the cable needed ,before i bought it ,it was my understanding that it was adjusted ,thinking that was what went wrong been trying to fix it .be most grateful for any help on this THANKS
Carrie's55 is offline   Reply With Quote
Old 12-12-2022, 09:00 AM   #14
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,848
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
Quote:
Originally Posted by Carrie's55 View Post
have a 1990 dt466 with a 4 speed automatic . an it wont kick down ,i read on here somewhere re someone explained how to adjust the kickdown cable ,an the cable needed ,before i bought it ,it was my understanding that it was adjusted ,thinking that was what went wrong been trying to fix it .be most grateful for any help on this THANKS

the way I have adjusted mine (MT643 and AT545 are the same) is to have someone (or bloick) the accelearator pedal in the floor position with the engine Off.



then get underneath the dash where the cable connects to the pedal (thats how it is on my DT360) and see how much slack I have.. there will be 2 cables going to the pedal, the one for the throttle and the other for the trans.. the one for the trans is the one you want.. it should be pretty tight where you can pull it from side to side a little but not much.. maybe 1/4 inch side to side movement without a ton of effort and definitely feels tight..



if its tight then the next thing to do is go underneath and pull the modulator off the side of the trans (you'll lose a little fluid. so be ready with a small pan).. if someone pushes up and down on the pedal inside you should see the pin in the end of that modulator move in and out.. if it doesnt then something inside that modulator is broken. if it does then the issue could be with the trans itself..



kicking down is also relative... the 545 and 643 tend to go into 4th gear a little early and must slow down quite a bit before it will drop down to 3.. this is the nature of how these are.. its much more noticeable in the 643 with thew lockup engage.. they can be adjusted with the "click wheels" in the pan if the shoft points are truly too low..


but I wouyld first check the operation of that cable modulator.
cadillackid is offline   Reply With Quote
Reply

Tags
at545, modulator, shifting, 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 07:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.