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The brass relief would be the place I would look. When it starts a deflate cycle you should get an initial woosh out of the relief as it vents pressure down to its set pressure(~6.5psi). It will then vent air slow and steady as it purges the air being fed back from the dump valves to maintain...

Well I suspect that a different pressure program would indeed have different overspeed points, but i think you having an overspeed issue with a newer model controller in an older truck(yours is an A0?) would probably be related to the differences in pulse per mile input. I believe it is a fixed...

If you disconnect the return line at the hand pump and fluid comes out of the line while pumping, the problem is probably still in the return side of the hand pump. If fluid does not return thru the line when pumping, then it is the line or something upstream...

It probably wont fix the overspeed...

Here is one with the control lever...

They make different variants of this pump, and on some that is where a control valve is located. Does that “tube” handle and the piece it is connected to rotate? It should be able to rotate clockwise 180 degrees It looks like it is bent down as it should point straight back. it reverses the...

Got a pic of the pump? The filler is usually a allen plug, front left when facing the pump. If it wasn’t sealed it would overflow whenever the AOP is used as the return pressure needs to get over 5PSI to find its way back to the AOP reservoir…

First off the pump is performing the work you are asking of it(raising cab or spare tire), correct? there are a set of steering check valves in the system, but they are on the return to the air op pump(circled in red). The hand pump is sealed, so when you pump fluid out of it, it goes into...

How does the front center diff fluid look? The front is 3 different reservoirs 2 hubs and center axle, with the vents tied together but they should never share any fluid… you should drain the center diff fluid and inspect it at the very least… this almost looks like some motor-pool maniac...

The bracket in question is #17 in this pic. Missing, broken or loose, you probably have a timing case crack. People have welded the case cracks in place, but the support bracket needs re-installed properly at any rate…

My low pinion DS is currently setting at 61” or 155.25CM, but I have no weight on a bare chassis right now so my suspension is extended a bit:) high pinion being 1/3 the angle(~3 deg?) and a few inches shorter(less mass) would definitely reduce the longitudinal forces. Under 5.5 degrees would...

you want the input and output pinions very close to/at the same angle, so the only reason you would use shims is to put the two pinions at the same angle. The only way to reduce driveshaft angle is to raise or lower something… you could put a high pinion axle in the rear end(raises the rear...

I am not sure what the rear shaft angle is on the trucks with a raised pinion, but Yes, steeper angle of the lower pinion axles, coupled with the ~3350 driveshaft RPM at 60MPH. At ~9 degrees on the older 4x4 trucks, highway RPM is double what the engineers say a driveshaft should be spun at...

Yep, they should use the same plug, yours is just hidden under the 24v cable…

Yep, circuit breakers. Those look a little more robust than the ones they used for the A0 panel. Mine are kinds cheesey:) You can replace them with standard automotive blade fuses. I would keep one in each size, as they can be handy troubleshooting intermittent faults.

The problem with water is it typically carries minerals and O2. Not to mention any phosphates or chemicals any soaps would carry. That is why saltwater is such a problem for circuit boards. If you use water I would reccomend distilled or demineralized and no soap. In my attempts to recover...

As you increase the driveshaft angle you increase the longitudinal vibration. This has nothing to do with the balance of the driveshaft, and a perfectly balanced driveshaft will experience it. It is a physical phenomenon brought on by changing the plane of a driveshaft operation(angle) using...

91% iso should be ok, and should still evap relatively clean. that and a brush should clean that board right up. I use a 3/4-1” paint or chip brush and cut the bristles to 1/2 length to make them a little stiffer. I would dry brush it first, then use the brush dipped in alcohol. This will...

Ok, the only time I have ever used freshwater on a circuit board was when I am trying to salvage one that has been immersed in salt water:) 99% isopropyl has been my goto cleaner for 99% of the time over the past 40 years. Doesn't leave any residue, doesn't interact with board, solder or...

Isopropyl alcohol and a 1” paintbrush for the board cleaning. Disconnect the batteries first and until the board is completely dry:) Sounds like perhaps the alt excite relay(K11) was not feeding proper voltage to bring the alt online. It needs at least 22v at the excite terminal(front...