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Yes!

Is there an “ice cube” relay in the control circuit and is it the right one?

Google says you have a “spares facility” for “nodal maintenance”. Circa 1986. This seems to have been a way for radio techs to have spare parts and diagnostic equipment in the field to keep radio networks operating. Not exactly historically significant. In my opinion you can gut it to do...

Sure. You could try a scissor jack right there in place.

That is the fluid swivel. I believe the capscrews holding the dust cover and blue gasket in place are not intended to hold hydraulic pressure, which leads one to believe the unit is leaking out internally. That is not a simple fix. The mfgr listed on the data plate might be a helpful resource...

I believe the injection pump rebuilder might have set the fuel rate wrong, not a timing issue.

Subscribed. These replace the 27450C which I am very happy with but are discontinued.

If it were me, I would first evacuate the system using a vacuum pump, then charge with 300 psi nitrogen, and see if the system maintains pressure over a few days. If so, drain the nitrogen and evacuate again, and charge with R22. You will need a vacuum pump, a bottle of N2 with regulator...

If for sure the TCU is good, suggest you check out the VIM under the power panel for issues such as blown fuse.

X usually means “I am dead, send me to Transmissioninstruments.com”.

2.5 miles with no oil pressure would equate to a grenaded engine.

When Stewart and Stevenson / BAE lost the FMTV contract to Oshkosh, it was a very unhappy period in Sealy Texas. Everything the S&S team had worked on for 20 years was gone. Everything they had either went for auction or in the dumpster.

If you live in flat Florida, all you need is a 4L80E transmission upgrade to get higher speed and keep the 6.2 alive.

Has anyone had any luck for parts at the Case parts house saying "I have a W11 loader" which the M4K is based on?

Great looking truck, paint and markings are first rate! That is actually the correct color for 1951.

Yes the 4 wheeled trailer is a M14 or M17 director trailer from WWII. Used to carry gun directors and generator sets.

Wiring looks really bad. Suggest this needs to go home on a towbar, wrecker, RGN.

I would inspect each and every pulley for nicks. I would put a straightedge on each pulley to make sure it’s not out of plane.

See pic

I believe that is the modern version of the AB-15 antenna.