HK Trucking

If you're referring to the E6 4 valve,1987 or 88 was the first time I saw them out there.

AND the result of a very poor or non existent maintenance program.

In the 79 - 80 time frame Paul is referring to, they were still using the short VIN.

And make sure the hand valve (trolley) isn't partially on.

Hi Paul. Is it possible that truck originally had a 676 (285), and it was replaced with a 675, but they put the intercooler and the 285 pump & injectors on the 675? To my knowledge, any 675, no matter what the prefix, is a 237, and would be turbocharged, but not aftercooled. What model truck is it in? I'm sure you already know this, but the VIN suffix for a truck factory equipped with a 675 (237) would be "85", and for a 285 would be "86". .

A Mack Quadruplex is a 5x4, all in one integral unit, as opposed to other types of 5x4 setups that use a 5 speed main transmission connected to a 4 speed auxiliary transmission with a short external driveshaft & U joints between the main & auxiliary. Fuller did make an integral 5x4 for a short time, it was the 20c75, but they're scarce.

DPF's are a pain in the ass. You say this will be in a fire truck, so how's that gonna work when the DPF tells the ECM that it's time for a "parked re- gen cycle, and the truck is at a fire scene pumping water?

It's "ETZ 675", and it's a 237 Maxidyne, same thing as an ENDT675.

Just cut off the nuts, drive the bolts out, clean up any loose rust & dirt from the trunnion shaft and the caps, then reassemble with new grade 8 fine thread bolts and tighten the sh*t out of the bolts & nuts. Now that I've seen a picture of the stuation, I notice there is still a gap between the cap and the trunnion stand, so there's no need to weld on anything to "take up the slop". Tightening the new bolts should pull it all together quite nicely.

When she's helping you work on that truck, it should count as "post graduate veterinary study". Performing cosmetic surgery on a Bulldog.

Congrats to your daughter, Rob. May she be successful in whatever career she decides to pursue. .

And he should also make sure to remove all loose rust & dirt from the mating surfaces of the caps and trunnion stands & shaft before installing the caps, or else they will loosen up again quickly as the rust & dirt sqeezes out during operation.

Use an air chisel with a mushroom bit and apply it to the face of the rim working your way around all the studs, also spray plenty of PB blaster around the studs and the center hole while doing this. That should break it free after 5 or 10 minutes of that treatment. Then try to remove the rim. Repeat if necessary.

Yeah, it says "overgear" on the shift diagram, so it would have overdrive in 5th, then the 2 splitter gears would be under and direct. Now that I think about it, overdrive in 5th would make it a TRTX720. Single overdrive trans instead of "double over" in 5th, the "X" means it has a lo lo gear.

I'll assume that you're saying you've got the 38,000 or 44,000 lb. Mack rears with the 4" adjusting nut, lock ring and jam nut. First, be sure to pre fill the cavity between the inner & outer wheel bearings with gear lube before installing the outer bearing. Install the adjusting nut (making sure the "dowel" is pointing outward), torque to 100 ft lb, spin the hub a couple turns in each direction to seat the bearing, back off the nut about 1 turn, tighten the nut again to 50 ft lb., spin the hub again, then back off the adjusting nut 1/4 turn. The bearings are now adjusted. Next, install the lock ring onto the spindle, making sure the dowel on the adjusting nut is in one of the holes in the lock ring. Then install the lock nut, I always tighten the lock nut as tight as possible with a breaker bar and pipe, then I use a chisel on the edge of the nut, and a couple good hits with a hammer (in the direction of tightening) to give it a little extra assurance that the lock nut is tight. Before re installing the axle shaft, I always add a couple pints of gear lube to the differential by shoving the dispenser hose down the axle tube. This assures that there is enough lube in the diff to fill the wheel end once the truck is in operation.

2 stick six speed TRXL107 in 1st lo is 14.10:1 multiplied by 4.17:1 rear end ratio is 58.80, just about at the "magic number" of 60.00 for off road startability, therefore it would work quite well. I've owned several Macks with that setup in the past, and I always considered that the "bare minimum" for overal reduction for dump truck use. Rob is proposing to use the Mack 10 speed with a 1st lo of 11.00:1 and rears with a ratio of 3.70:1 which equals 40.70, nowhere near enough reduction to get a loaded dump truck moving in soft ground satisfactorily.

You need cool air for the intercooler, so underhood air just ain't gonna cut it.

It's a "later" model 285 (called a 300) or a 315, or possibly even an E6 350 2 valve, as evidenced by the 2 stage (water and air) intercooler. It doesn't have a Jake brake, and I also don't see any electrical terminals on the valve covers, so no Dynatard. American Bosch injection pump. Regarding air filters, that engine would have originally been equipped with a double element (1 element for engine intake air and 1 element for intercooler air) Donaldson air cleaner, or a single element air filter for engine air only, and a separate underhood air filter for intercooler air, with an air scoop on the hood. Neither of those filter setups were OEM on a B model, so you're going to have to adapt something and make it work. I would recommend looking at Matt Pfahl's B61 photos in the "bmodelsrus" gallery. He has that type of engine in a B model and has an air cleaner on each side of the cab - one for intake air and one for intercooler air.

Calm down Thad!!!! You just have to realize that it was probably created by someone from V*lv*. That would explain everything!

That was known as the "PLN" (Pump/Line/Nozzle) electronic fuel injection setup, as opposed to the individual injector pumps (one for each cylinder) used on the E Tech engines. A mechanical has the red stop knob that you pull out to stop the engine. Electronic engines shut off when the key switch is turned off. Also look at the accelerator pedal. If it has the linkage hooked up to it, then it's mechanical, if it has a wiring harness connected to the accelerator pedal then it's electronic. E7 427 would be electronic though.

If it's a 427 it would be electronic. I've never seen or heard of a mechanical 427.

My opinion: The crack is already broken, so welding is the only way to repair it. Once the crack is welded, you bolt on the reinforcements instead of welding them on, because the heat ofwelding around the edges of the reinforcements would alter the metallurgic characteristics of the frame in the weld zone, possibly causing a future crack or break there. .

My CH was licensed at 54,000, but I'm sure it was grossing well over 60,000 at times when it was hauling on a jobsite where weight laws were not a concern. It had a Eaton Fuller RTX14609B which I think has a low gear ratio of abot 14:1, and the rear axle ratio was 4.42:1 E7 - 350 motor.

Over the years, I've found that on 10:00x20/11R22.5 rubber, if you multiply the lowest gear ratio in the transmission times the rear axle ratio, the product must be at least 60, or the truck will not have good startability fully loaded in an off road situation without abusing the clutch.

Bob, after reading your original post, I think a Granite tandem axle may be overkill at this point. Mack doesn't currently offer a truck in the weight classification you seem to be seeking, but as Thad said, how about an International single axle with a 10 ft. dump box, heavy duty pintle hitch, and air & electric trailer brake hookups? The company I've been working at for the past 2 1/2 years has one, here are some pics: It has the IH DT466E engine. We have the tailgate salt spreader on it also as you can see. Nice little truck, we use it to pull the 20 ton tag trailer with air brakes, and it also has a receiver hitch and electric brake hookup for pulling the small bobcat trailer. The box holds 7 cu. yards and we use it to deliver loads of topsoil to residential customers where a big truck just won't fit. .