EastTex Cartage

I have researched installing the Allison HD4560 in various different chassis, mostly to improve driver comfort on long days. As I understand it, the Allison HT740 is a 'mechanical' automatic trans with a non-locking convertor and the HT4560 is computer controlled with a locking convertor. I know (I have seen) a Mack Rd688 with an E7 and Allison HD4560 from Mack, so I know its possible. To convert? Probably need to get the VIN off a factory automatic Mack and do a dealer parts change list -or- you would need a stand-alone controller for the Ally - which I have never found. Also need another program for the engine, I am sure they are completely different. I know of a company in my area that converted a Freightshaker from manual to automatic and they spent something on the order of $20-25k.

I am looking for the factory shop manual(s) covering the removal, rebuild and installation of the mechanical injection pump on Mack E7 & EM7 engines. Also a E7/EM7 factory engine manual covering the rebuilding process. Any help is appreciated.

One reason the windows get sticky is the weatherstripping in the window runs located inside the door swells and gets misshapen with age. Replace it and it gets a bunch easier to roll up and down.

I am looking for a R series wiring diagram, specifically for a 1994 RD-690S.

A 315 tire needs a specific 9" wide rim, the 11R (8.25") rim is not the right width and isn't made for the pressure. They will fit on a 8.25" rim, but if you run up on a very, um, 'by the book' trooper or CMV officer, it could be a problem. Plus, your tire guy will hate you, lol.

One thing about the EM-7, the torque (1425 lb. ft.) comes in at like 1000 RPM. It might work well just like it is, especially with that Allison. I have heard nothing but good things about the pair. The thing about Mack RD/MR/RM trucks, they will never be race cars, but the don't get stuck (Unless it just sinks completely) and are very reliable if you service it regularly. I have a 1994 RD690S (as a dump truck) with the EM-7 @ 300hp and an Eaton 10spd an it is a VERY reliable truck. It routinely hauls 17-19 tons, daily. It's actually my most profitable truck, lol.

Does anyone know or have a chart that shows the various chassis measurements for the RD/DM chassis? I'm looking for specifically the BBC (Bumper to Back of Cab) measurement and a few others.

It is my understanding that a EM7 is different than an E7 in the respect that it builds torque down low, like 1400lb. ft. at something like 1000 or 1200 rpm. I know it is best paired with a 5/6/7 speed Mack trans, mine had a Mack T2070 paired with a pair of 5.73 geared CRDPC92/CRD93 differentials. My experience with this truck is that it will not see 60mph, but when all others get stuck, it will crawl through almost anything. Its not a rocket, but it is as reliable as a bowling ball - you just cannot break them.

I had the same issue and I was under the truck greasing and inspecting and found that the ride height valve had failed - that is the little white plastic tube had broken in two.

Yes, its the one on the top.

I am looking for the cowl door vent on a 1994 RD690S Mack, as mine got bashed.

Mack R series kinda wrote the book on vocational trucks. The E7 was designed as a low RPM engine. They are not race cars. They will haul dirt/sand/aggregate/whatever through things other dumps just will not. Most R series do not have a 'diff-lock' per say, but they have a centrifugally activated 'peanut' setup that really works. They will last forever. I also have an International, which started life as a dump and the rear diff housing has been welded many times. Asking the rearend guy why? He replies 'It's not a Mack'

Is there a reinforcement that the pull pin/pull ring mounts to behind the front bumper? Its a 1999 RD688