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The lube turns into hard pieces and gets stuck in places. I would start with seeing if there is air going from the compressor to the air dryer. Small steps.

If the air compressor is indeed not making pressure I would check the governor first. Its mounted on the compressor. And the unloader could be stuck open. The lubricant can harden over time and cause issues. The unloader can be rebuilt without removing the compressor. Its a dual piston...

I think its good to have the heater element in cold weather. I think it makes a difference at negative temps.

I can take another tomorrow that’s the only one I had on hand

It folds out and goes past straight. If you push on the cab it’s as locked as it gets. If your pivot is stuck then it won’t work right.

I have seen the whole oblong assembly installed backwards. You can see bottom right of the pic the lock arm is fully open.

The arm folds open and locks out. As best as it can for what it is. So if you push on the cab it’s locked open. And to start closing it, takes hyd action to pull the cab and arm back.

The cab brace should fold out and lock when the cab is fully open. I had a truck that was giving me hyd function issues I swapped the control box and all was good. I had planned on taking the bad one apart and see what was going on with it but haven’t gotten to it.

It shouldnt. It could just be a stored error that will self clear over time. There are wheel sensors that detect slip, some valves on the frame rail and the brain behind the cab.

There are 2 filters in the control box on top there are hex head covers that come off and then the filters unscrew and come out. The parts tm shows the breakdown of the control box. There are 2 different styles. Again any water in the system will cause issues like you are having.

On the c7 you might be able to read abs codes with a heavy truck reader. 3126 not sure there may be a separate diag port for it. The module by the air/hyd pump. I think there is a breaker for it in the panel.

You may have to bleed the spare hyd feed. Happens. When you run your pump is it puffing out the breather on the pump?

The cab will usually slowly creep down on its own once you get it started going down.

How does the fluid look? Any water in the system. That will cause those issues.

The fan solenoid is normally closed which keeps the fan on. Unplugging it should keep the fan on. Sounds like an electrical issue. Maybe a ground somewhere.

My years of experience with NY truck is lots of rust. Rust all over, corrosion in the brake cans. Buy a truck down south and have it hauled up here.

I never met him in person but I spoke with Ron several times over the years and he was always nice to me.

Unfortunately with the electronic cat, diagnosis can be tricky without specific equipment. An off the shelf heavy duty vehicle code reader will pull basic codes. Some trucks have a power line filter on the supply to the engine computer. Seen those go bad. May pop a breaker in the panel. If the...

I have not seen non mil ones. But I do believe it can be rebuilt by a heavy equip shop. I have some used ones. There are 2 different types. They changed around 1997.

It is supposed to be a 40/60 power split and in regular mode the two driveshafts can spin at different speeds so you dont get binding when turning on hard surfaces. If the front axle has no traction in regular drive mode the rears will not spin. Figured this out one day when unloading from a...