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Does anybody have a wiring schematic for the M939 Protective Control Box? I design power distribution systems for heavy equipment & would like to know exactly what is going on inside that box without gutting mine, just in case I need to replace one or somebody else needs a replacement /...

I emailed the Kansas Highway Patrol, Kansas Dept. of Revenue Driver's License Dept, & Kansas Dept. of Revenue Commercial License Dept. & ALL THREE said that my M931 is not considered a commercial vehicle & I do not have to have a CDL to drive it. 1) I'm not making money with it 2) It weighs...

Has anyone ever tried mounting a 10-foot CONEX box on the back of an M931? Remove the 5th wheel & bolt down a CONEX box right on the frame. I've got this idea & wondering if anyone has ever tried it.

Ok, it is something like 20 degrees outside & my two M931's are giving me ****. I cranked both trucks over & got fairly heavy white smoke out of the exhaust stack. The fuel is burning just not lighting off. I hit truck #1 with ether & it fired right up. Idled rough for a bit but smoothed...

Does anybody anywhere have a dyno chart for a stock NHC-250 Cummins? By dyno chart I mean horsepower/torque versus RPM chart. One that showed volumetric efficiency % versus RPM too would be awesome. Thanks!

About to go down to Texas & get my two M931's. Trip will be 648 miles, will post pictures!

What size are they? The truck ain't here so I can't measure it. DOT plastic tubing but what size? What is the NPT thread size on the 90-deg outlet fitting on the bottom of the air dryer? This info is not written in any TM or website on this planet. Help a brother out. Thanks.

Hello. I have two M931 (A-zero) 5-ton trucks that I bought last summer from Red River Army Depot. Everything on the trucks was good to go EXCEPT some bastard had taken a hammer & busted off the air hose fitting that connects the air dryer to the first (wet?) air tank. Neither truck was...