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Never saw it in a TM but could the Head output pressure be checked at one of the 6 ports that are on it's side?

Do you get a good stream of fuel out of the bleeder that is between the secondary and final fuel filters. By gage it should be 4 to 7 lbs. Patracy you had your coffee yet. OP's location is in need of help.

Too be honest I am getting old and don't remember. It has been a LONG while since I had to do the adjustment so whatever it takes to get to that rear stud. If it does not need the arm removed that would make it easer and then you do not have to do a no load just warm up the motor and wind out...

Tm 9-2320-272-24-4 Yea can't guess around here or someone might start a rant about TM's. LOL What through me off is the pic of the transfer case interlock post #3 which locks the range. The air cylinder that controls front engagement is lower and in the middle of the transfer case not on top...

I believe you could in a no load run up. The fuel required for no load test is nothing compared to the fuel needed for power pulling the truck plus load. Yes it is a good thing to check but I believe the high idle screw will fix the rpm problem. Here we are just adjusting the governer so remove...

Yes. Just watch/mark the angle of the linkage arm when you remove it to get the tin cover off.

Easy fix.

Yea it does like to have a slight roll of the tires to help with the shift but that can't happen if we try the no air trick. I never did the block off the air trick and when all is working correct I feel it is better to have the transfer case locked in range. As said try and block off the air...

Yes service the air system. The draining of the tanks has an order to check the check valves. On the Deuce it is outboard first and the inner tank should hold all of it's air. If not then the check valve is bad. Same with the 939 series has an order to drain to check the check valves.

Yea I have had one that was so bad that after removing the control assembly and the nut that holds the shaft, hitting it with a hammer would not free up. This was a spare that I did not need so I did not worry about getting it freed up. You can try any or all above but if you have to go as far...

You would have to come to Newberry and help me unbolt and load it. Not cheap sorry.

Did the 939 series put the one way check valve between all the tanks like the Deuce? This would stop anyone tank from draining all the others. Been awhile since working on the 939 and CRS is in full bloom.

And can the motor even get to 2600 in Neutral. All fluids up to Temp. raise the rpm slow and see if it will go there. Do not snap the throttle for the test. The only other thing I can ask now is do you know the truck is in high range. This has happened before where OP's did not know about the...

Wish you were not on the other side of the world as half of my garage is full of them.

I might check the no load RPM when you have the motor up to temp. Then you can work it from there.

15 mins. of looking and most NAPA carry truck parts too. http://www.steelsoldiers.com/showthread.php?139694-M939-low-air-switch

No just go too any truck parts place and get a 10 buck low air pressure switch. I can not find the thread where I had all the info. Here is the pic where I just used the military ends. Our search is not very good I can not even find my own post's from the past.

No problem fixing your IP but you are needing to fix the address line. US is not correct answer for location.

First thing I might do is remove the inspection plate on the bottom of the housing. With a flash light look up at the throw out bearing while the motor is running. The TB should not be spinning.