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Parker makes the valves. You want my advice, take the whole thing to a hydro shop that works on cranes (I went the Seattle crab boat route, on the docks), dump it on their counter, and smile a smile, and just let them sort it out. You find the right guy in the back, he'll see it as a mystery...

That just heightens the mystery, actually. That's the LVAD, but it has air springs and a soft skin cab just like the rest, at least originally. My theory depends on them having a FMTV variant which doesn't have airbags, since the switch for them is missing on that part. Shrug. Who knows? Thanks...

Haha, we're going around in circles. Look it up in... what? The TMs we have are for OUR trucks. We already know this part is not for OUR trucks. It's for some OTHER mystery trucks. The guess is the late model FMTVs with the full armor cabs but we don't have those TMs. I don't even know if they...

The question is what vehicles is NSN 4730-01-527-8543 for. If we knew the NSNs for those vehicles, it wouldn't be a mystery...

Tm 9-2320-365-24p

If someone knows how to look that up... I've checked the usual online databases and they don't seem to have the UOC information. In the TM (-24P) it assumes you want to use it on a FMTV since that's what the manual is for.

On the A0 trucks the -24P specifies two parts. 12420621 and 12420621-001. The latter is CAGE 0FW39 (BAE) and the latter is CAGE 19207 (US Tank Automotoive Cmd). They do the same job but the valve arrangement and subparts different, so they call it out. The NSN is 4730-01-457-8479 and when you...

At least it's not skydrol...

So uh the original fluid is apparently H5606 (for trivia's sake), and I went with Mil H 23282. This is the synthetic version of 5606. Overkill: probably. Both 23282 or 5606 are going to be anti-corrosive.

Whatever good idea fairy lead to the fluid they used, I am sure the reason wasn't lack of money. Maybe they just thought they had enough 18 year olds to change the fluid on an interval. I've actually never looked in the TM to see what the r/r interval is supposed to be. Maybe they wanted to use...

When some of my valves went bad due to corrosion I had the same symptoms OP describes. It was quasi sporadic. The pump was working against a check valve or whatever that wouldn't open - it was actually on the fluid release side (past the cylinder) in my case. To get the cab down I had to crack a...