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That fitting on the back is the vent port. It usually has a hose attached that runs into the center of the dash to a vent port in the floor up in front of the radiator. Is there not a hose attached to it? the treadle valve is a manual pressure regulator. It passes tank air from its input...

It is going to go on the back of the habitat box I have planned. I removed all that hardware for the tire crane, lifting arch and air filter/exp tank, so I could build the habitat right up close to the back of the cab so I can fit a pass-thru. The air-filter is going up on top of the cab. The...

There is an A1 diagram here on SS. https://www.steelsoldiers.com/threads/fmtva1-electrical-schematics.158229/ you don’t appear to have a LBCD, that looks like a pic of a polarity protection device or PPD. The LBCD has a box on the mounting side that houses caps and one end looks like the...

IDK, but have sure come across it a lot on the forums. Mine locked up once. Was able to free it, like most people, by repeated up and down cycles. I think the real trick is after you pump up, which should release the safety check, you need to release the pressure very very slowly so it flows...

Or center it and anchor it in the middle.

I would say that if the flooring is buckling when it warms, it is fit too tight and you need to trim around the perimeter to give it room to expand and contract as it heats and cools… common in many types of flooring and siding to leave perimeter room to allow for expansion…

Yes you can do that to initiate a pressure check. I don’t think you can operate long term like that as the controller is looking for it to cycle in response to it using air from the wet tank during a fill. You can also connect a pressure gauge to the wet tank and measure switch resistance. The...

All the ports on the hydraulic system are SAE-4. They use SAE-JIC adapters to match up to the JIC-4 hose ends… Once you remove the screen, hollow Allen spring retainer and outer spring, You could probably unscrew the check ball seat using an easy-out, or drill it out, to remove the seat, ball...

In the video up at comment #38 in this discusdion, my system took i think 2100PSI to lift the tire. A 2" piston with a 1" rod has about 2.35sq/in of piston area in pull. Multiplied by 2100PSI, thats just shy of 5000# of pulling force to lift the tire with that horrible geometry... Getting a...

Yep, should be low voltage signaling… Not sure what interface he is using or how he is using it though…

Yea oil-line-o-death is a 3116 thing. You have oil forward and above. I think this may be something less sinister than a rear mainseal. You can of course confirm this by moving that plug from its stowed position and putting it in the drain port and drive for a bit and see if any oil comes out...

There are not many resistors on the truck, most are resistive heating elements. It sounds like this is the termination resistor on the data bus. Sheet 7 on the schematic…

Yea they usually wont move at all when the safety is hung up. It isnt still chained down is it:) If it moves, that sounds more like a clog at the control valve orifice. If you loosen the fitting facing to the rear of the truck on the cylinder, and you can move it further than 1/2" and fluid...

There is a safety check ball in the cylinder base. It is held off of its valve seat by a spring. The fluid flows around the ball and past the spring. If the flow gets to fast it compresses the spring and the ball seals and locks the cylinder. This check works with the restricted orifice in...

I guess if your latch leak is bad enough, that could also allow the outflow from the cylinder to be great enough to trip the safety in the cylinder base.. If it locks again when you try to lower it, you may need to disconnect and cap the line to the cab latch...

Or you have gotten air in the cylinder. Because of the angle that cylinder sets at it is succeptible to the inconsistent flow caused by air pockets in the oil. This can cause the cylinder to lock in the up position as the load/safety check gets pushed against its seat and held there by the...

Yea the engine is probably OK with that much HP if you can keep it cool:)… I think I would be more concerned with the transmission. The highest 3000 series spec I have seen is in the lower 300s…

If you are using the lower pump, you need to add the fluid to the lower pump. There is an allen head screw plug on the rear outboard corner. The control valve system is plumbed so that it sends returning fluid with a preference to the lower hand pump, so it always remains full/topped off. In...

if it is only 3/4 up, As soon as you shifted the cab control to lower the cab should have come down via gravity... 1. Where was it leaking? 2. Where did you add fluid?

Yes they can be rebuilt, but you need to be absolutely certain the mechanical park springs are caged properly when you break them down or else they will kill you when the locking collar is removed…