speedometer sending location
My MH equipped with an Allison md 3060 is showing some erratic speeds on the dash indicator. I had a similar problem several years ago and it seems like I loosened and rotated a sensor located on the ...
Forum Discussion
Electrix wrote:
John, the Allison MD3060 has three possible ways to operate a speedo;
1 - an output speed signal from the transmission ECU,
2 - a screw in speedo sender fitted into the rear transmission housing,
3 - a toothed wheel fitted to the rear flange and a speedo sender fitted to a bracket.
Option 1 is available from all Allison transmission ECU's.
Options 2 and 3 are fitted by the OEM if they don't want to use the ECU output.
How many speed sensors are fitted to the rear of your transmission?
The plastic one on the rear rhs is for the ECU. It has a single bolt with a 13mm head holding it in. It is fitted to all MD's and is not adjustable. You would have shift problems and the transmission fault light on if this was faulty.
The screw in speedo sender is on the lhs. Depending on the type it may be adjustable.
I have 2 sending units of some type held into the transmission by the 13 mm bolt as you have described. The ECU was rebuilt last fall and the problem started happening just prior to the ECU going out. I am trying to find the part numbers for the sensors that are on the tranny.
