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Well its not the front QR you hear, it is the park valve itself venting the air in the line between the park valve and the anti-compound valve. up behind the center of the grill above the center of the radiator is a vent port thru the floor(in under/forward of the heater). That is where the...

The anticompound is the only component that controls air to the park spring chambers. It is a relay valve, much like the service brake relay right below it on the crossmember. It differs from the service relay in that it has a 2way check valve built into its input, so can accept two different...

Yea, Neil did a fantastic job! Cutting the DS RPM in half with the eco hubs actually brings them onto the angle/max RPM chart...

Yep, the trucks with low pinions are running the shafts way outside the angle/rpm charts which cause longitudial vibrations. The rear shaft is right at the 61" max length for this type, so has more mass which is what gets moved to cause the longitudinal vibrations in steep angles@high RPM...

Yea CTIS isn’t very smart. It is expecting things to happen a certain way in a certain timeframe, and if it doesn’t see it, it faults. It probably first starts with a sensor test to see if the pressure sensor on the PCU is reading atmospheric pressure. Then when the air system fills, It...

You could do either with a sawsall or a portaband in just a few minutes. Cleaning up the notch with a die grinder. I like the handheld bandsaw for this job as the cut is more precise/controllable. I would make the front and rear cuts straight to depth, and then cut inside those lines and...

When the outlet is greater than the inlet, and it shifts to dump, it also feeds back a little air from outlet to inlet port. If the controller held the PCU in the pressure test state longer(Control valve closed), the pressure on the dump inlet would have steadilly increased untill it...

Well the CTIS plumbing is pretty simple. The single output from the pressure control unit manifold goes to a T inside the frame, by the rear of the trans, passenger side. One port goes to the front axle dump valve input port, located a foot forward to the right of the transmission. Crawl in...

Well it doesnt change how the valve works. In normal ops, the vent port can only expel air returning from the outlet port which should be connected to the tires. Another possibility is you have a severely kinked or crimped line to the input port of the valve. This allows enough flow thru...

Bad voltages and grounds cause issues, but it sounds like one of those units is programmed for a different pulse per mile than your vehicle delivers. I think Superman can reprogram them

The only way air can dump out of the dump valve vent is if it comes from the tires. If it dumps as soon as the manifold applies air to the system, then I would say the dump valve is installed backwards. IE: truck side line from the manifold connected to the output port and the lines to the...

The problem with that chart is it does not say what exactly of the many systems actually failed, just that the truck experienced a failure. These trucks were not designed and built to support a profitable enterprise, so design compromises WERE MADE. All those A0 failures could have been in the...

The 24P manual(found up in the manuals section) will have most of the parts and exploded diagrams for the A0 and 3116. For engine specific parts, you can also go to parts.cat.com and enter your engine s/n and search up parts specific to your build. For instance if you then search for...

Looks great, havn't seen a popup add since you made the announcement. Which is good as they were starting to change the button functions. People get used to just clicking the close button, so to up their click count, they simply change the close button to another open-add button And add a...

Each hub has a vent line and those two tie together and back to the main/center axle housing. It is the inboard fitting on my axle. The T fitting is on the inside of the passenger frame rail on mine, you can use that fitting to determine which lines run to the vent ports on the hub. The other...

Thermostats? There is only one for the engine… the 6X tractors with the auxiliary transmission coolers have a thermostatic control valve in the oil plumbing that decides if it wants to send fluid to the secondary cooler found on those tractor models, but the 4X4s only have an engine...

The pushbutton light switches are known to be a little problematic. The switch assembly should also have a good ground connection…

It wasn't just a governor adjustment, it was a governor and turbo replacement. There is an adjustment that you can do that will roll on the fuel a little earlier off idle, but that is not going to effect Peak torque output or HP. The governor is matched to the turbo, you replace them both and...

What Colt said, These trucks were not built for highway efficiency, they were built to meet a military specification(milspec). In this case I think it had to be able to overcome a 18” curb at max weight? Weird things happen in the land of milspec, like the grossly oversized battery to meet a...

I doubt the winch is blocking much, as there is plenty of room for air to get around in behind under the intercooler. These trucks have horrible natural rolling/ram airflow and the fan is a necessity when you are making heat. With the truck turned off, the fan should be locked and you should...