I have seen a few times a hair line crack where the fitting threads into. You might be able to take a picture with your phone and then blow it up to see. You pointed to the fitting that threads into the control valve, double check to make sure the leak is not coming from above.
Pipe dope or...
I think you have a couple of issues: 1-the cylinders leaking could be a: seals around the pistons in the cylinders or b: a relief valve in the control valve. C-Your control handles could be bypassing oil activating the lift and tilt spools. Both functions lift and tilt have their own circuit...
The o-ring at the tip of the fitting really does not matter. I have reinstall many hoses with out the smaller o-ring with no issue. For some reason Bobcat did this for a while, never knew why. Also JIC fitting never need an o-ring on the tapered side of the fitting unless you are using it as...
Does the machine shut down on you? If it does you will need to remove the sensor and install a pressure gauge to confirm pressure. If it does not shut down then the sensor has likely failed.
The only reason I can see steering the machine would cause the code to go away is maybe under a load...
Does your machine have 2 speed? If so the brakes are released by charge pressure with a 12v solenoid. This might be why moving wiring allowed the machine to work.
I just worked on a 753C series machine that was in an underground coal mine. This machine did have the BOSS system and a mechanical brake, The wiring was a disaster and had a "G" series cab, this thing is mess. I just ran a fused push start button to the starter and a pull kill cable on the...
If I remember correctly you do need to buy the 14 pin kit. When the "G" series machines came out and the 7 pin connector was introduced it was designed to to talk to the computer on the more advanced attachments such as a stump grinder, snow blower or asphalt planer. Years ago I had to wire a...
Not sure it would be worth the money. At a minimum you will need new drive motors, hydraulic 2 speed valve and the electrical components to make it all work.