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Thats why it is probably easier to test pressure at the oil sample valve. It has a small AN/JIC fitting, but you could just slip a hose over it and clamp it in place with a hose clamp to get a pressure sample… it is also far easier to access than the oil pressure sensor… with no/low oil...

Your problem could also be as simple as a loose fitting or pinhole in the return line that is keeping you from pulling a vacuum and delivering air to the hand pump reservoir instead of fluid… This design always struck me as mickey mouse. They really should have just run the return line thru the...

I am not sure of the specifics of overhauling that hand pump. when you lift the cab, you send more fluid to the base end of the cylinder per inch of travel than is returned from the rod end because of the amount of fluid the rod displaces. the hand pump being sealed should go into a vacuum and...

Yea it would have destroyed itself with any running with no oil pressure. You can connect a mechanical gauge to the output port on that oil sample valve to confirm that you have decent oil pressure when you open the valve. If thats OK, move it as needed, then fix it with the correct sensor as...

Exactly, voltage isn’t good until tested under load. I feel the same way about CBs in automotive applications. Prefer fuses, but the CBs can be handy when chasing a intermittent overload issue. I kept the best in each size from my panel when I started going thru it and installed fuses…

Yea there is a couple ways to fry the fish. Loading the circuit is definitely a good thing to be able to do….

Mmmm Purty… you will need a voltmeter to see if they are passing voltage:)

“Did I mention it was loud”…:)

The test I described above would be a good next test. Disconnecting line C and applying regulated air directly to the system is another great way to look for system leaks. You said you connected a line and regulator. Did you shutoff the air supply after you pressurized the system? If the...

Yep, they can be a pita. Glued! Morons… He did the manual jumper method I described above and when he went H-B the jumper got hot in his hand, so something is pulling excessive current somewhere. When we last spoke he was working on looking for cross wiring between the solenoid wires To...

That black cover should slide back to expose where the wires are soldered into the pin cups.

That looks like a weak or high resistance electrical/ground connection to the coils of the PCU solenoids. A bad connection will pass full voltage, untill you pull current thru it. On a relay or solenoid coil it sees full voltage, and starts to build a field to pull in the contacts or plug...

A complete set of the military A0 manuals can be found in the manuals section here on steel soldiers. These include the 3116 engine manuals… As mentioned the driveshafts are steep and spin too fast. This in itself makes vibrations, any issues with the shafts make this worse… most of these...

Welcome to the dark side:)

yep, pretty sure you can talk to all of them with the correct interface…

Yes…

The filters are on the tire side of the wheel valve, so restriction there would only effect the speed at which the tire inflates or deflates, not valve operation. any restriction would have to be on the truck side of the wheel valve to effect valve operation. Air comes in from the truck and...

It is probably not the transmission. Spinning it at lower RPM would probably cause a little less gear friction heat, but the heat generated is more a factor of the load placed upon the gears, and that is really a factor of the work they are being asked to perform. If the truck is the same...

Well the rubber glove test isolates it to just the one wheel valve, and you can add air to the wheel using an air chuck at the wheel schrader valve to see if it is having trouble sealing at higher pressures… but in the end, the vented air must come from a tire thru that wheel valve…

Well the quick release valves don't “open” they are pressure regulators. They match the output port(tire side) to whatever pressure is applied on the input(PCU side). it does this by passing air from the input port to the output port if that pressure is greater, or venting output port air to...