5th gear lockin solenoid on Allison trans ?

[corvette9]

Anybody know what the 5th gear lockin solinoid dose? I found it in the TM but it dose not tell me what it dose. It seems to have a power and ground wire and what I think are air lines. In one side out the other. Still trying to find out why my M936A2 will not shift manual.

 

[Derrickl112]

.

 

[corvette9]

No it won't down shift or up shift by moving the shifter. I can put the shifter in 1st gear and it will shift as if it was in 1-5. You can move the shifter to any gear and no change of any gear at any speed. I took the shifter tower cover off and all seems fine. I had someone move the shifter with me under the truck and the lever on the trans is moving it's full range. But R and N work as they should.

 

[rangereter]

The solenoid puts the xmsn in 5th gear/TC lock-up @1300 rpm +/- and prevents trans slippage (when pto is engaged). In this condition the pto will spin @ proper rpm for the main hyd. pump to have required flow (gpm).
Regards, Bob

 

[corvette9]

Thanks

 

[SouthwindFarmer]

Hey corvette9
I'm having the same problem with my M931. Where you able to diagnose and repair? Allison transmission shifts fine automatically but doesn't respond to changing gear manually. Thanks

 

[1 Patriot-of-many]

delete