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Sounds like your clutch regulator on your manifold is not set up right. There are 4 pressure ranges for 4 groups of gears. High gears use the least amount of pressure . Your allowed +2 psi or -2 psi or it doesn't work correctly . Also if you went down any step grades and the engine rpm exceeded...

I'm picking mine up next week. Cant wait to tinker on them . Tried to win 2 more today locally. but they went way out of budget !

Did you find anything helpful in here ? http://www.steelsoldiers.com/showthread.php?135020-TM-for-MEP831

I just got a mep -806a and it wasn't like that at all?

There is a check valve inline from the fuel pump to the injector pump. check it for being sticky or trash in it.

The m915-m920 are a dual voltage truck . With the majority of the load being 12v. The alternator is only rated for 18 amps of 24v.

I 2nd Gimpy !!

I think it looks great !! I know you have put a lot of time and effort in it !!!

Somewhere near the top of the injection pump there is a screen. There is a post about this around December. Maybe see if you can find it. They had pictures. It sounded like the same problem. If not it could be a issue with the float in your day tank.

Now that will get the neighbors attention lol!! Very nice !!!!

About a foot more inboard than the hydraulic pump. There is a cable that runs to it that moves the spool. It gets water and snow and salt splashed on them and they rust and don't move. Some pb blaster and a hammer with a aluminum drift or brass . Also if I remember correctly there is a hex on...

It's a steel spool not stainless. They rust frozen.

Did you check your spool valve under the truck to see if it's frozen ? It's a common problem.

Did you unlock the drum brake ???

Very nice! !!! :-)

What model 5 ton ?

Check the same valve on yours. Aldo make sure you oil tank is full. I had the same problem. Ended up being 5 gallons low and stuck valve.

Glad you got it fixed !!

I think your going to find its either the button or linkage. Or in the switch.

Do a search ! This has happened several times, and there are several posts on it . Can't remember if its a transfer case issue. But I believe it has to do with it not being all the way engaged.