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Topic: MD3060R Transmission  (Read 1312 times) previous topic - next topic

MD3060R Transmission

I am having transmission problems.  Yesterday, while taking off, the transmission was causing the coach to jerk and jump. The gear numbers were flashing. I checked the codes, oil was ok, the D1 showed code 3500, D2-5 didn't show any codes. I manually shifted to second gear and shifted manually to the campground, I didn't use first gear.
Code 3500 shows to check:
*ECM connections are tight clean and undamaged
*VIM        same as above
*wiring has correct power and ground connections
Where are the ECM and VIM boxes located  on the coach and connections on the transmission?
Another problem I have had was the retarder switch didn't light up but retarder worked normally. I checked bulbs and changed relays and didn't fix it. With this new problem the retarder doesn't work.

Thanks for all the help
Ron


Ron Clark
Sherwood,Arkansas
1999 U 295 40 foot Build # 5550
2020 Jeep Gladiator
Motorcade # 18173
FMCA # F485593

Re: MD3060R Transmission

Reply #1 –
Ron,

I don't know where the Allison ECU (or the VIM?) is located on your coach, but perhaps the document linked below might help your trouble shooting efforts:

Transmission - Allison MD 3060 Troubleshooting Manual [Page 7] | ManualsLib
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: MD3060R Transmission

Reply #2 –
Here's where the ECM is on a 97 and the connection point on the transmission end. Don't know what a VIM is.
jor

ECM: You'll likely have to remove a carpeted plywood cover that is velcro'd on.
Transmission: It's on the driver side.
jor
93 225
95 300
97 270
99 320

Re: MD3060R Transmission

Reply #3 –
If all else fails....American Shifty Corporation | North Little Rock, AR

They are in Little Rock.  I am told they know all there is to know about the /Allison trans. 
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: MD3060R Transmission

Reply #4 –
If you take it to a shop Ron you have American Shifty on Broadway North Little Rock and United engines at 9401 I 30. Both are Allison dealerships but I've used neither for Allison. I would talk to both and make a decision. I've used them both for semi gears with no negative results. Good luck.
Dub McBride 1996 270

Re: MD3060R Transmission

Reply #5 –
Your ECM should be at the top of the water pump compartment.
Regards,
Brett

'99 42' Foretravel Xtreme
'14 Brown Motorsports Stacker
'05 Chevy SSR
'02 BMW R1150R

Re: MD3060R Transmission

Reply #6 –
Thanks for all the replies and info. The Forum is top notch. I am open to any more info anyone has.
Thanks again.
Ron
Ron Clark
Sherwood,Arkansas
1999 U 295 40 foot Build # 5550
2020 Jeep Gladiator
Motorcade # 18173
FMCA # F485593

Re: MD3060R Transmission

Reply #7 –
If it was/is jerking and jumping I would make sure the bearing in back of the transmission harmonic balancer is not loose,it can be checked with a pry bar.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: MD3060R Transmission

Reply #8 –
UPDATE:
 I have a metal plate with a couple of solenoids and three relays and a 30 amp resettable breaker that powers the ECU on the forward wall under the bed. I found a couple of corroded connections on the solenoid and breaker was rusted. I replaced the breaker and cleaned up the connections, including the ground cable, and put dielectric grease on all connections.
The voltage from post to ground was 13.2 volts but when I checked from the wire lug to ground was 9.8 volts after repair voltage was 13.2 both places.
For future reference always check voltage or continuity on the wires not posts.
I want to thank everyone that responded and thanks for your help.
ECM was behind the 12 volt air compressor covered by a carpeted cover then a several bundles of wires. I hope this helps others.
Ron
Ron Clark
Sherwood,Arkansas
1999 U 295 40 foot Build # 5550
2020 Jeep Gladiator
Motorcade # 18173
FMCA # F485593

Re: MD3060R Transmission

Reply #9 –
Quote from: rclark –
UPDATE:
 I have a metal plate with a couple of solenoids and three relays and a 30 amp resettable breaker that powers the ECU on the forward wall under the bed.
Congrats on the trouble shooting and finding a fix!

The 12 volt "automotive" wiring diagram (B-2126) in your owners manual should show that 30 amp circuit breaker.  If it does, make a hand written notation on the diagram indicating the fact that it powers the ECU.  Might be a help to some future owner of your coach, or even to YOU if your memory is anything like mine (IE selective...)

1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: MD3060R Transmission

Reply #10 –
Quote from: rclark –
UPDATE:

For future reference always check voltage or continuity on the wires not posts.

Ron
What an excellent point.  Thanks for sharing.

Richard
Jan & Richard Witt
1999 U-320  36ft WTFE
Build Number: 5478 Motorcade: 16599
2011 Jeep Wrangler Unlimited w/Air Force One
Jan: NO5U, Richard:KA5RIW
The selected media item is not currently available.

Re: MD3060R Transmission

Reply #11 –
Please post photos if not too inconvenient. Someday someone will be searching for help with a similar or identical issue and a photo of the relays and breaker might prove to be the key that gets them smoothly down the road. ^.^d
Don
Quote from: rclark –
UPDATE:
 I have a metal plate with a couple of solenoids and three relays and a 30 amp resettable breaker that powers the ECU on the forward wall under the bed. I found a couple of corroded connections on the solenoid and breaker was rusted. I replaced the breaker and cleaned up the connections, including the ground cable, and put dielectric grease on all connections.
The voltage from post to ground was 13.2 volts but when I checked from the wire lug to ground was 9.8 volts after repair voltage was 13.2 both places.
For future reference always check voltage or continuity on the wires not posts.
I want to thank everyone that responded and thanks for your help.
Ron
The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: MD3060R Transmission

Reply #12 –
Good post to bookmark.
Dub McBride 1996 270

Re: MD3060R Transmission

Reply #13 –
Don
here is the pictures as you requested for my update. Look close behind the terminal with blue zip tie at the corrosion and the 30 amp breaker that is rusted between the blue and yellow zip ties. 
Ron Clark
Sherwood,Arkansas
1999 U 295 40 foot Build # 5550
2020 Jeep Gladiator
Motorcade # 18173
FMCA # F485593

Re: MD3060R Transmission

Reply #14 –
Thanks for the follow through. I redid that electrical component panel a few years back. I did this as part of a larger charging system project. Here is a link to the topic (with pictures including those below) which may be of some use to you as you decode what does what on that panel.
Charging System project
Don

Quote from: rclark –
Don
here is the pictures as you requested for my update. Look close behind the terminal with blue zip tie at the corrosion and the 30 amp breaker that is rusted between the blue and yellow zip ties. 

The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: MD3060R Transmission

Reply #15 –
Don

Thanks for the Charging System project link and for the labeled pictures. They are greatly appreciated.
Ron 
Ron Clark
Sherwood,Arkansas
1999 U 295 40 foot Build # 5550
2020 Jeep Gladiator
Motorcade # 18173
FMCA # F485593