What's wrong with this picture.

[coachgeo]

I spy something wrong here... Do you? What is suppose to be there? (yeah not searched TM yet. I thought this more fun and educational for all)

 

[cucvmule]

Pop off valve?

 

[cucvmule]

Is that the fuel or air tank?

 

[coachgeo]

Is that the fuel or air tank?

Main/wet air tank.



According to Ronmar (thanks ) appears to be feed to the cab air ride bags. PO did disconnect that system. Air to engine fan clutch and to CTIS comes from all this plumbing as well and neither works, so now I know why. Previous Owner was not a dummy so am guessing he used the pressure adjust valve before it to basically close off that whole line. Now I will check with a balloon to see if any air comes out of it.

 

[frank8003]

I spy something wrong here... Do you? What is suppose to be there? (yeah not searched TM yet. I thought this more fun and educational for all)View attachment 783529

regulator backed off FUN

 

[tennmogger]

That's the Over Pressure Valve and the adjustment screw is not too far off from "normal" with 6 or 7 threads showing, best I can tell. 8 or 10 threads is typical. Screwed in more, as it is, puts more pressure on the diaphragm and should increase the "pass" pressure, possibly to a pressure above wet tank pressure in which case it won't pass air, especially if your system pressure happens to be low too.

The OPV might be stuck causing failed hydraulic pump and fan operation. They do that. Just unscrew that tubing fitting and see what comes out after wet tank pressure gets ABOVE the OPV set point. With the tube disconnected and the wet tank full, screw that adjuster in and out until the OPV dumps. Adjust OPV so air dumps out after wet tank pressure exceeds about 70, 80 psi (not critical).

The OPV is easy to disassemble without removing it from the truck. Back off the adjuster screw to relieve spring pressure then take out the two screws. Catch the few parts.

 

[Ronmar]

The protection valve set pressure is 85 PSI...

 

[Reworked LMTV]

Let me translate this: "It's the thingy, next to the little thing that that looks weird, and I think there's something next to it that might be a funny looking thing, you know, by the tire"

Your response: "Thanks honey, I'll get right on that"

Main/wet air tank.

View attachment 783554

According to Ronmar (thanks ) appears to be feed to the cab air ride bags. PO did disconnect that system. Air to engine fan clutch and to CTIS comes from all this plumbing as well and neither works, so now I know why. Previous Owner was not a dummy so am guessing he used the pressure adjust valve before it to basically close off that whole line. Now I will check with a balloon to see if any air comes out of it.

 

[Coffey1]

 

[FloridaAKM]

Mine looks like this:

 

[FloridaAKM]

Mine looks like this:View attachment 783870 Now I totally understand what was wrong. Thanks for posting that picture.