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Just a follow-up on this, I tore the whole PCU apart and there was some crud in there. I cleaned everything as best as I could and re-assembled but I re-used all of the existing o-rings and seats. It made a dramatic improvement in the leak down that would occur during the “check and hold” test...

Interesting, well it is definitely venting during a check and hold, but not a hold only, so I will pursue this as the culprit for now. Thanks for the help, very much appreciated. Been spending hours on this problem and neither the Army TM nor the Dana manual pointed in this direction for the...

so I was thinking about what you said about the vent. My PCU vents to the cab, and as-such is hard to check for leaks. I tried the rubber glove trick over the vent cap just now, and after the check and hold test, there seemed to be air coming out of this vent. Not enough to make a sound you...

I have been chasing leaks for hours and used gallons of bubble mix LOL I absolutly cannot for the life of me find any leaks ANYWHERE but some leaks around the wheel valves. To me, they don't seem significant enough to produce the rapid drop off in pressure on the control side when the system...

So playing with this a bit more, mine behaves as you say. When I energise control but NOT supply, the control lines eventually get to a point where the pressure stabalizes, and the QRVs stop dumping. However, when I do a "Check and Hold" which sends pressure first and then holds control, the...

On your video, if you send the shot of air and then let go, you are able to observe your tire pressure and the pressure in the control lines stays stable. On my truck, the pressure in the control lines does not stay stable. It is always dropping. I do have some slight leaks around my wheel...

If you energize the control solenoid but DO NOT give it a shot of air, what is supposed to happen? On my truck, as soon as you energize the control solenoid, the pressure as reported by the PCU transducer slowly rises until the tires begin to deflate out the QRVs... Is that normal? I suspect it...

Yeah I am going to go to Harbor Garbage tomorrow and buy a regulator.. I got a little impatient last night and hooked it up to the shop air as-is and while no hoses blew off, there were some creaks and groans, so I hope I didn't do any damage...

Thanks for all the helpful info, that manual controller looks pretty sweet! Good job on that. that being said, I do have the Dana Diagnostic Tool which has an option for test and hold (among other things) that will allow for in-depth troubleshooting. This is why I want to run the truck off the...

Hey all. Has anyone had experience hooking their LMTV to shop air so that they can troubleshoot air issues without the engine running? I tried hooking up to the front service gladhand, but the system didn’t take much air. I looked at the pneumatic schematic in the TM and I think maybe that’s...