Transmission oil light

[MCSFBN]

I tried searching and not sure if I searched correct or not but I was unsuccessful in finding topic on possible issue. I have a 91 M925A2. I am still going through and working on things as budget allows. Truck is operational and has its legs stretched about 2 times a week and engine warmed about 4-5. While I am driving I have noticed an amber light in the cab that at about 55MPH begins to flash. It is labeled as "TRANSMISSION OIL". I have watched all other gauges and nothing appears overheated and when I bring her back down to around 50MPH it stops flashing. Am I low on fluid even though it seems to show fine when checked. Is this an indication of something catastrophic lurking? What causes this and what's the function of the indicator light?
Thank You!!

 

[dmetalmiki]

When was the truck last (fully) serviced? I would (Be tempted to) Check the transmission filters. And or, the temperature control switch.

 

[MCSFBN]

Honestly I'm not sure. I did not think to ask previous owner because I was so stoked I was finally getting my truck. However I do have intentions of doing so pretty soon when we get some clear weather. I have been looking at one of the complete service filter kits. Anything else I would need?

 

[dmetalmiki]

Read up section v11 Page 3-353. In TM2320-272-24-1. (2-3-4 (are further interesting reading)).
Strange how the army T.O. lists a "temperature pressure sensor switch".
There are a host of decent suppliers of filter kits and accessories, just google 'M925A2 transmission filter kits'.

 

[doghead]

Does it have an overspeed light near the transmission light? Maybe the wires are incorrectly connected. A look at wire numbers and schematics may help.

 

[Rmtaunton]

I am trying so hard but it's so....


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[Rmtaunton]

.

 

[Jbulach]

Does it have an overspeed light near the transmission light? Maybe the wires are incorrectly connected. A look at wire numbers and schematics may help.

Yep, I'd say it's the overspeed light!

 

[74M35A2]

DH and JB are correct. It is an over-speed light tied in with the CTIS system. Tires are rated at 55mph.

 

[M35A2-AZ]

Sounds like the over speed light to me also.

 

[doghead]

I wonder if there is a dashboard drawing with explanation of everything on the dash, in the operators manual for this truck.

 

[MCSFBN]

Rmtaunton....your trying hard for? Am I missing something? Thanks for the replies folks. All help and guidance is greatly appreciated. If my questions are trivial I apologize. We all start learning at some point. My little 15 year stint was focused at patrolling and calling for fire as a Marine rifleman, then ECPs and air base ground defense as a air guard security forces member, so very little truck driving and a lot of grunting.

 

[MCSFBN]

Sure is doghead but by your own answer earlier you addressed an issue I wouldn't have thought of while staring at said schematic.

 

[Jbulach]

A little poking and sarcasm is a lot better than a real issue with the truck!
The overspeed light will come on at lower MPH, with each lower PSI setting on the CTIS, and if I remember right stays on constant while using the emergency setting.

 

[74M35A2]

I though dh's response was on the polite side. Next time, I'm going with tranny is shot, crush the truck.

 

[MCSFBN]

No hard feelings here and no problem with sarcasm. That's why I used the smiley face thinking that would clarify I wasn't offended. I also briefly explained why I was asking a possible bone head question, I'm a grunt and ironically enough my sister in law married a guy from Motor T that she met while visiting. Should use him as my personal walking talking TM. 74 I ain't crushin the truck have you seen the price of scrap lately.

 

[Rmtaunton]

Yes we all were new at one time and congrats on the truck by the way and trust me you aren't the first to ask that very question


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[MCSFBN]

Rmtaunton Thank you! I honestly have done more riding in my personal 5 ton than I did in Uncles. I also just found TMs linked on the Texas A&M site. Put Drivers, maint 1,2 & 4 all on a disc. Time to start reading.

 

[juanprado]

Rmtaunton Thank you! I honestly have done more riding in my personal 5 ton than I did in Uncles. I also just found TMs linked on the Texas A&M site. Put Drivers, maint 1,2 & 4 all on a disc. Time to start reading.

I would recommend you make sure the TM's are the 2nd generation dated 2012with the abs brakes and latest/greatest since you have an a2. They are listed here in the tm's.
http://www.steelsoldiers.com/showthread.php?121487-TMs-for-M939-Series-Trucks

 

[MCSFBN]

Roger that Juan. Thank You