Mark T

I might be calling it the wrong name, but there's that valve that interactas between the service and parking brakes. Some have that anodized steel cover on the top kinda triangle shaped. The function of them is anti compounding. Depending the manufacturer they look a little different, but do the same thing. That little valve in the picture is a double check valve. ( I've heard of them referred to as shutle valves ) That valve doesn't belong in that part of the system. an anti compounding valve ??? well.... one could go there. Believe it or not, I've seen this before. Guy will try using the double check valve as a manifold (?) Parking brakes will work once or twice, then that's it. or maybe bleed off over a while, seem to work then back to not working. It is a little confusing between differnt manufactures and different areas where guys (like me) tend to call things by the wrong name or a differnt name than what guys call them in a different part of the country. Someone's got something plumbed incorrectly in that truck and it's not easy to call it via text and a few pictures. 🤔 someone mentioned that already

I didn't wanna say that, but...

I think the picture on the last page is a schematic with what is sometimes referred to as an inversion valve. Another form of valve for anticompounding. That little guy in the picture is a shuttle valve. That's a valve like if on a truck there's a hand valve. So if air comes from the foot valve, that's one signal to the relay without bleeding back to the hand valve....or vise versa. That little guy doesn't belong there. That post on the previous page is a system with an inversion valve . It's deceiving because it's a generalized drawing.

It's likely not working.

Yes, but it doesn't belong there . Not on maxies

Why is the double check valve (shuttle valve) there ? That's usually used to receive air from either a foot valve or a hand valve (trolly valve) . Did the same guy that didn't have any issue welding on the frame's flanges think he could use it to send air to two different places ? Just for kicks, try gutting the check valve and see if all your issues go away.

That 1925 looks like maybe it was on some kind of tour or something that lasted 2 years ????? Thing's a hundred years old now, holy cow.

Pretty much what those guys said. Not too long ago I upset a guy sharing my opinion of them (the AMI engine) They were not Mack's best idea.

Careful commenting on AMIs 😏

It's too bad you can't find a better parts guy. But like Geoff said, try a new bearing. It just might work. By bearing I mean the outer race and all .

OMG. I didn't realize earlier. Today 1/17 is big Mike's birthday

I have questions. Do you get to call him "barry" ? Did you ask what it's like to be hit'n it with a dude ? Did you console the poor F#&k he didn't get a forth term ?

You don't hear much about that.

Well Bob, if it walks like a duck........

Love the posture of George Washington. My thoughts exactly.

Big Mike 😆 I'm a believer

her ?

Not a racist.... not a homophobe.

I'd love to know more about that trip the '25 made. I see stuff on the side of it, but can't make it out. I bet it's an interesting story.

761

Back before all these split draws and returns, I used to run the trucks on one tank. Just shut off the side it didn't draw and return from. Clean it out before opening it up again in the spring. Used to do a lot of Upstate New York. Might've had to stop more often for fuel, but it avoided a lot of issues.

I wondered if it was richened up to compensate for running on a mix with number one in it. Canadian trucks always seemed to run good down here. I even cut one back for a guy that had a Cummins in it. Kept burning pistons. That one you literally couldn't stay in the garage with it running.

When I was at the place, I was overwhelmed take'n it all in. There was so much on those trucks I would never have had any idea what they were like when in service up there. It was quite the experience. That was only a few miles up out of Vermont too.

I had Superliners fro Canada (eh?) I had to go back with one of them for warranty work. Those trucks had the tanks cut down for export. They did it to all of them at that place. When I was there the part that was cut off the tanks had what was basically a coil that was in the tank and the engine coolant plumbed through it. Then the engine had shutters behind the radiator and a full winter front. Guy told me the one from up Mistissini was used to being in 30 below conditions. I often wondered if that's why that truck ran so good down here. Like if it was richened up just to run right there.