Search results

The park/emergency controls are supplied by T fittings that also supply the pressure transducers in the MMDC on the passenger side of the treadle valve where there are pass-through supply side ports on the valve: There are no 2-way valves that I can find under the dash though.

Ok so I did confirm that the AOP supply is coming from the two-way valve off the side of the anti-comp valve and that 2-way is indeed controlled by the park control air. So my marked up pictures above are correct. I chocked the wheels and disengaged the park diaphragms (found leaking fittings at...

Negative. My truck is not "floaty". Even at 80 mph. I can let go of the wheel at freeway speed and the truck drives perfectly straight. Different tires of course....... no run flats in mine either.

You don't think the valve that's off the elbow of the anti-comp valve park air inlet is a three way for the AOP supply? Or is that not park air coming into it.... damn I need to trace the line to the hydraulic panel. I'm going to disconnect it at the panel see which line it is in the back.

Steering related? I doubt that. Your truck has fewer miles on it than mine had when I purchased it. All the drag link and tie rod boots were shot but the joints were TIGHT. I cleaned them all out, packed with new grease, and installed Energy Suspension urethane boots. Downstream of the steering...

It probably would never happen, and the reason is simple - the vast majority of the time you are either replacing a single part at a time, or replacing one line at a time - part fails or line fails, etc. And in the military if you forget what went where you just go look at another truck in the...

It would appear that my A1R is plumbed how you are suggesting. I don't have the load valve but my anti-comp valve is T'd into the primary treadle valve supply for the relay valve below it and I have no secondary treadle valve supply T at the brake protection valve.

Yeah - try swapping your spare to one of the front wheels and if that does nothing try it on the other side. I've never experienced anything like that on my same model truck. I have 20k miles on mine. Running MV/T's with '22 date codes. What date code are your new tires?

Wheel hop? Can you take a video? Not sure what you are describing. Vibration? Is it speed dependent?

The line from the hydraulic control panel is coming from the back of the truck. Looks like it's coming from a 2 way check valve off the side of the inversion valve? One port on the three way (?) is T'd into the park valve air line coming into the inversion valve.....

Well that is the newest diagram I can find. Indeed the dryer discharge is not T'd off to the tanks. It goes through the wet tank and the only thing T'd to that is a 3/8" line..... I guess that's "TO DRESSED ENGINE" - whatever that means. That line is in the bundle of lines going toward the front...

What are you thinking they could assist us with?

I'm going to check the newest sources I have for other diagrams. Yes they did delete the load proportioning valve - not present on my truck.

I just pulled this up to look at - posting it here before I try to read this myself o_O I compressed the image file and attached it so the forum wouldn't resize the image to unreadable. This should be the A1+ pneumatic system schematic.

Mostly under the dash on my truck. Both sides. Also found some push-lock fittings on the back of the air-hydraulic control panel.

I'm wondering if the service air tank check valves are leaking back to the wet tank - just very slowly and more-so when cold. I did replace them....... I do agree that in theory if the check valves are perfect the service tanks should stay up but prior to swapping the dryer they would always...

That's what I thought too. But this dryer has TWO relief valves. One that was originally 150 psi (Haldex later changed this to 175) that is the safety relief valve for the discharge check valve, and this unit which is a 250 psi relief valve. I'm thinking this 250 psi valve is on the purge signal...

I've been fighting my air system not holding (perfect) pressure overnight since I bought this truck in '21. Even after fixing every leak I could find, the pressure would drop overnight - depending on ambient temperature - usually from full tanks to about 60 psi but at times if it was fairly cold...

Most surplus tire suppliers are selling them in that price range for "less than 5 years old" date codes. I mean - not terrible given these cost about $2k per tire for brand new - 1/3 the cost for 1/2 the life - not that bad all things considered but mounting them is a beast of a job so you're...

All the trucks use the same radiator: 2930-01-519-3573