doubleclutchinweasel

Some systems used an actual anti-compounding valve. The porting between the service brakes and the exhaust side of the parking brake does the same thing with no extra parts. Pretty clever design.

It’s actually a very simple system. Not absolutely necessary, of course. Yes, you can work around it.

That small line may be the anti-compounding setup. If it is, it applies pressure to the release side of the parking brakes through the exhaust side of the parking brake valve whenever the foot brake is applied.

I think you are all over this!

I wonder if you can back the internal adjustment of the clutch all the way “off” dust to see if the problem persists. Still sounds like something dragging internally.

The only other thing I can think of is a bad pilot bearing. But the intermediate plate would be my first guess. And that’s all it is…a guess!

Sounds like intermediate plate binding between the drive dogs. Front disc is probably trapped between the intermediate plate and the flywheel. Intermediate plate must float freely between the 2 discs. Normally they rattle a bit with the clutch pushed in But, I’ve been wrong at least twice today already.

Really does sound like something amiss inside the clutch assembly. Disc reversed. Intermediate plate issue. The cable seems to be moving the release bearing. Release bearing not properly engaged?

Does that clutch have the internal "ring and pinion" adjustment setup? Is that set per the instructions? You mentioned having to pus one of the internal plates into place. That could be dragging...maybe?

Was that a V12?

What's is go in? Too big to fit under the hood of the truck it was on. Marine? Generator? Off-road equipment? Looks like it had a clutch at one time. There's another smaller engine behind it on the trailer. Can't see it too well.

Any circuits that the automatic had to "close" that are being left "open" by having the new box in it? Or was it all in the 'puter? Or could it be as simple as a wire pinched off during the swap? These blasted new-fangled gadgets...

Mack or Eaton box? Well, there are several pieces in that system (Eaton is in my mind...Mack probably similar). Air regulator. The range selector on the stick. The slave valve on the side of the trans. The piston on the range shift. Any of them can cause a problem. The slave valve has a plunger in it that only allows air to pass through while the box is in neutral. Not sure if those are prone to sticking. Maybe start at the incoming line and see how far the air makes it. Or start in the middle (stick) and see if air is making it that far. There are guys on here who will have better troubleshooting tips for you. Sounds like a good one for FJH. Or Mackpro. Or Joey.

Only thing we need...yep, you guessed it...is MORE PICTURES!!!

Saw this on the back of a step deck last weekend. Anybody able to identify it from this angle?

Fuzzy draggin' buzzard wagon!

I liked the old chromed steel shutoff and throttle buttons. Aren't too many of them left in service any more. Seems they've about all been replaced with the plastic knobs. I seem to recall 2 versions of the throttle knob. one was a T-handle and one was a round knob with a knurled OD, IIRC.

You’ve got gold there, Bob!

Would be awesome to find some original vintage tach and speedometer pieces, as well as an original fuel shutoff button. But that stuff is getting hard to come by,

Yeah. He was proud of that one.

You ever get this sorted out?

Yep. Right under you fingers. Easy to give a little "flick-flick" without taking your hands off the wheel. I always thought the early R models achieved "dashboard perfection"!!! LOL!!!

Okay, this one fits! "If you Photoshop your wife out of pictures of your truck..."

There's always the "Other Truck Makes" section! Don't need a Mack to post there!

There is a lot of good information out there on the interweb about proper phasing of yokes and about different ways to handle shaft angles. Like Jo-Jo said, straight in line is not a good thing. Equal angles on each end of a shaft are generally considered a good thing. I have also seen "equal and opposite" angles on each end of a shaft work. Plenty of good info out there about this. I'm sure it will all work out.