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That relief Just screws into the PCU, but It sounds like it is working correctly. That is how it holds the truck side at 6-8PSI to keep the tires deflating. If you hold it in, the dump valves will feed tire pressure back to the truck side, without that relief venting it, the truck side will...

The thing with the wires is the fan control solenoid. They are on all the time, unless the fan is on, so getting warm is normal. There are 3 solenoid valves in the PCU(under that bottom cover). The PCU vents into the plastic cover on the bottom. There is a hose attached to that bottom cover...

Yea there should be screens just inside the glad-hand openings to prevent insect intrusion…

You are using both controls right? Park air controls the trailer control air source…

If I recall correctly, the one I bought from Omni was $175, but that was 2 or 3 years ago…

Omni glass and paint in Oshkosh WI…

Yea air drag is a big factor, you double the air velocity, you quadruple the drag… for practical purposes, you are going to have to do some pretty extensive modifications to make these rough contoured bricks any more aerodynamic… The kicker for an over lander is the need for protective...

Yes, drivers/port side are left handed thread…:)

Left wheels are left hand thread…

Yep, HEUI oil pressure can indicate how hard you are working it…

I think when you are dealing with this much weight, rolling drag and wind resistance, finding MPG sweet spots is not easy. I think you have probably done the best thing in that regard by re-gearing. Getting the sustained load closer to the peak torque RPM is probably the best thing you can do...

In order for the dump valves to stop dumping, either the truck side(between PCU and dump valves) air pressure needs to go up to tire pressure, or to drop below the pressure needed to close the wheel valves. Now when a deflate cycle is finished, it gives a shot of air to stop deflate and...

While looking up another part today I came cross these 3 port “L” configured ball valves. A pair of these could be used to control 2 cylinder circuits from a single pump, like the dual selector I showed in the drawing above(Would just have to move 2 levers). At $32 ea, a pair of these would be...

Oh, and I like it a lot…

I think the empty cab is around 1600#, so another 600 is +37%? Where that weight is located will make a large difference in lift requirements If you are keeping tire crane: The tire lift is about a 50% increase in pressure(2100psi) over the cab lift but still well under the pump capacity and...

Now that crap right there is why my wife rolls her eyes at me… there are people running 85-90 PSI tire pressures on these things without issue, so it is hard to say why yours are having issues. You might have a flaw in a hub that eats seals…

The PCU uses whatever pressure the wet tank can provide, but with the restrictions and the tires ability to absorb air, all the system plumbing and axle seals don’t really ever see peak system pressure . If you connect air like I described above on the PCU output, you can only apply air...

Like Superman said, The wheel valves are only open and the axle seals only see pressure when the system is actively checking, inflating or deflating. All other times, the system is de-pressurized and the wheel valves are closed… The problem with troubleshooting leaks on CTIS using the...

You don’t have to jump it all the way over the engine to the run solenoid To test it. You can simply connect a jumper from ENG to the 24V output terminal on the alternator after you start the engine. The cable on the 24V output terminal connects back to the battery so it always has battery 24v...

It being brushless, there are also 2 fields to collapse, so the regulator is a little farther removed from control…