JoeH

This truck has 18,600 hours on it, not all of them by us. Truck has about 250,000 miles, we got it around 215,000 or so. Our trucks meter concrete to the nearest 1/10th of a yard, this one packed out full will do 10 yards, weighing in at roughly 73,280, PA's max triaxle weight. This particular mixer is a 1975 Daffin Concrete Mobile. We renovated it from a 7 yarder to a 10 yarder and have had it on the road for nearly 5 years now. Daffin no longer exists, but some of their mixers are still sneaking around, we have 3 of them. One of Daffin's dealers, CemenTech, ultimately wound up buying Daffin Concrete Mobile rights, and today they are a major Volumetric Concrete Mixer manufacturer. Sand, stone, cement, water all kept separate. There are 2 tanks on the passenger side for calcium chloride (accelerant) and air entrainment. It's a "ribbon feed" manufacturing unit, basically meaning it siphons materials continuously. Materials drop off a conveyor that runs above the truck frame into the auger you can see sticking out the back of the truck. Three 4' chutes can be hung off the auger for a total reach of 18' 6" (on level ground) from the back center of the truck. Can start and stop at any point, and the auger will have anywhere from 1-2 wheelbarrows in it depending on auger mix angle. If customer gives me a heads up when we are almost done the pour I can usually time it so I only leave a 5 gallon bucket or less of washout. This truck mixes slow at a rate of about 15-17 yards per hour, CemenTech makes a mixer that will put out 90 yards per hour! That's a little fast for us, a lot of our customers use wheelbarrows. A barrow would be full in about 2 or 3 seconds, and would probably get knocked over in the process. These trucks can be used in remote locations and can mix concrete non stop as long as you can keep feeding materials in. You could literally mix concrete 24/7 without having to stop the truck. Some structures like silos and water towers get poured continuously with Slip Forms So there are no cold seams. Being only 15 miles from the edge of Philadelphia, I've never been anywhere remote with our trucks. We also don't bid on jobs, we're C.O.D. Which means nobody owes us money, and we pay our bills.

1995 RD688S

So to throw everything off, here's a picture of a 1976 U685T flatback cab with long handles. Has the tan plastic interior that was used up to the end of the R series. I think it was indicated that the flatback was pre 1973. Just noted that Mr Hancock indicated the U model stuck with the flatback cab. Where would I look for a cab designation?

If you drive local and don't mind the tow back if it fails again, no big deal. If the trucks going to fail out across the country I'd do the cam. Either way I'd drop the oil pan and get as up close and personal as possible to that cam lobe to check its condition. I assume the cam can be seen from underneath, I've never had an oil pan off anything other than an endt676.

See if it's an endt675 237 hp motor

Lol that looks like a custom job from a driver that got fired not too long after the boss saw it.

Mine has the same grab handle as the newest RD's, I pulled the pass side off the U to stick on my 2001 RD tractor. Fit like a glove. I've got the stomach bug, so I'm not going out today to see if it's a flatback or +3 cab.

I think Rob or someone was about maxed out on picture uploads, he might have deleted posts to make room for more pictures.

I have no doubt someone here will be very eager to take them off your hands!

Wonder if that's factory.

I've got a U single axle dump with the long handles. I forget if it's a + cab or not.

It takes a special crew to be willing to drive trucks that old today. AND must be hogging all the good drivers.

Is the flatback running a straight piped?

Wow. That truck could have gone on that pull til it ran out of fuel. I'd be worried about that truck frame, that's a lot of torque to hold the front of the ground, let along that far up!

Yeah I found them on Google maps. No website, one B Mack in the lot, if they have more trucks they must be on the road or have a satellite lot. That lot by the tracks doesn't look big enough for more than a truck or two, especially if they have to store customers trucks to work on.

She says the world will end in 12 years if we don't do something drastic now. Her green new deal is estimated to cost 75 Trillion dollars. 8-15 trillion dollars of that estimate is to combat the climate change that will end the world. If the world was going to end in 12 years, wouldn't you put a little more of that 75 Trillion towards saving the planet?

Could have been a quarry or site truck too. You can load as much weight as you can stuff into the dump body so long as you don't touch the road.

What's they switch to, kenworths? Or did they shut down?

That's what I was thinking. 65k dumped into both of those trucks would give you a couple really nice (older) trucks. But I know the drivers are pushing for granites, they do ride really nice.

Some of those trucks were really rough. This one will get painted white and should give us a couple decades of service at the least. I expect some of the others will make their way into similar hands. Or they'll go to the Coopersburg Kenworth salvage yards for parts so we can all keep our old trucks running, because we all know Volvo won't help us out with these old trucks....

So the ReMack engine is failing emissions? I hope it has a warranty, I know very little about them. There's a thread on here somewhere recent about how to liven up your AI460. Read the thread and wait for someone who actually knows about this engine! 😎

On my phone I change the aspect ratio to 3:4 or something like that in editing mode and it cuts the file size down to about 1.2 MB. Wouldn't let me post here til I figured that out.

What were the daily problems and the major breakdown with your 93 and 94? As long as the double frames are solid and not splitting apart from rust you could rebuild the engines in the frame. Go through the driveshaft and replace all the u joints if they're suspect. We just did insulators in our Camelback rears, they take a day to do, cost us about $700 in parts. Brakes are easy to do at the same time. Synflex air tubing is relatively cheap and easy to replace while you're at it. Our fleet consists of a 1979 R686ST, a 1995 RD688S, and a recently acquired 1988 RD690S to replace a 1980 DM686SX. Old is just fine, though your driver's will grumble. We test drove a 2004? Granite when we were looking to replace our 1980, and man it was nice. I'd never driven a Mack newer than our 95 RD, but the granite fit like a glove. Was used to the truck before I even pulled out of the dealer lot on the test drive. But the double frame was cracked right behind the cab and it was air ride(terrible off-road) and had roughly 1,250,000 miles. If I had your money I'd be after a couple early model year granites, but my dad and I are the only ones that drive our trucks so we stick with Reliable instead of New(ish). Our 1979 never misses a day of work, with the exception of routine maintenance and planned repairs, like last year's engine brake delete.

Because he is rammy, always full throttle til the last second when he has to stop before hitting someone? Put a cab cam in.

Same Mack's have it on the flywheel, the older ones I'm familiar with have it on the damper.