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89DM686

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  1. thats my thinking. Truck will see upwards of 250,000lbs gross, so, thinking the wide torque band will be insufficient on gradeability. Don't need a C box, Maxitorque already offers plenty of reduction as is, but, being able to have some reasonable splits will probably help, and gaining an OD gear for empty running coming home. I think a 1241D would be fairly ideal splitting between under and direct and then having OD for coming home. Don't think a single countershaft 3spd would survive torque multiplication coming out of the Maxitorque in underdriven gears, and one of the big 2spd Eaton aux's weren't designed to shift on the fly.
  2. I've looked over for rust issues thoroughly. Luckily, as a western truck (it operated out of Baggs, Wyoming when it was a mixer) the truck lived in a much drier climate than a lot of Mack's out East do. I've found some surface rust areas around the cab, but, nothing cancerous. The most important aspect, the frame, is very clean. No decades old concrete stuck on or heavy rust. The cab and hood have a couple rough spots, nothing unfixable though. The main center bushing for the walking beam appears to be in good knick, the control arms will need rebushed, but that's a pretty minor job. Interior wise the seat is a little rough, but a peak behind the dash shows good, if dusty, wiring.
  3. Well, I'm not entirely sure whether to post my latest acquisiion in the antique or modern subforum, as she kind of sits in between being a genuine classic (70s and earlier) and modern. So, if the moderators see a need to shift my topic to another subforum please do. Vicky is a 1989 DM686, ex-mixer chassis that I bought as of last week, clean title, running and driving (if a tad low on air pressure in the tires). I bought the Mack for the purpose of building a heavy spec local 4-axle tractor. I run heavy haul through the hot months, largely within about 150 miles of Denver. We do a lot of jobsite to jobsite work, rather than dealer to dealer or manufacturer to dealer work. My primary tractor is Suzie-Q, a 1990 W900B Kenworth with a 444 Cummins and factory 6x4 set of boxes. I love her to death, she's been an absolute sweetheart to me. She's grossed over 200,000lbs, and does it without question. She's got DS402 4.44 cogs out back, dragging weight isn't an issue. That being said, Colorado allows pretty aggressive axle weights, and we get into some specialized work requiring high frame load on the power unit. I've pushed the DS Eatons as heavy as 62,000lbs (no lift or jeep) under limited circumstances, but, at this point I'd like to have a heavy spec for that sort of thing locally, while Suzie can run the big stuff when we get the 2-2-2 or 2-3-2 out to spread weight. Vicky has a 20,000 steer and 54,000lb Mack rears on walking beam "suspension", a rather euphemistic way to describe Mack's walking beam suspension. She's short, too. All of a 190in wheelbase. I'm intending the strip the rest of the mixer gear and slip a 20,000lb lift under her, giving her a 94,000lb GVWR. With a four axle tractor, maximum legal load on the tractor is 90,000lbs with an annual oversize (20k on steer, 70k on three axle drive grouping). Sitting pretty on that one. Assuredly, some site or off-road moves we'll be throwing the axle weight limitations out the door, as well. Vicky has a 1071A Mack 6spd. One of the things I was happiest about this truck having, as it gives me the nearly absurd 23:1 low hole. I'm considering dropping a 1241D behind the 1071A, however. The truck does have the high torque rise E6 in it, however, I'm thinking, in mountain situations, when needing pull heavy grades, some ability to split the 6spd might be useful to me. Honestly, the 1241D would largely be used as a 3spd, primarily splitting between under and direct, and then gaining the OD gear for empty running in the auxiliary. I'm wondering if anyone here has experience with adding an auxiliary behind a 6spd or 5spd Mack and if they feel the addition was worthwhile. I don't want to swap to a different main, so to speak. The 23:1 low is ideal for extrmely heavy starts. Other plans include Cozad ramps and pintle hitch out back, headache rack. She'll get some chrome, but not much. She'll be kept in form to do dirty work in nasty conditions. A single, short stack, chrome cap, polished tanks and diamond plate fenders are about the sum total of planned shiny things. If you happen to know DM's well, feel free to add whatever knowledge you have. I bought the truck knowing the older mechanical Mack's tended to have bulletproof components, precisely what I want when I'm going to shove 45 tons onto the power unit. But, I can't say I know a great level of detail about Mack components. So, teach me what you know. Troy.
  4. New Member here on BMT, but some here may know me from Just Old Trucks, I'm Coloradogreen over on Hank's Truck Forum and JustOldTrucks. 27 year old owner-operator, I work primarily in heavy haul and oversize, but run a variety of freight during the cold season, whatever pays. My primary tractor is a 1990 KW W900B, Suzie-Q. She's an absolute sweetheart. 1280 CPL 444XT Cummins with a factory 6x4 set of boxes and 4.44 DS402 Eaton cogs. I bought her 3 years ago, and have hauled everything from time sensitive coastal produce to circus equipment to 140,000lb machinery with her. Absolutely love driving her. As mentioned, my primary work is heavy haul. Colorado is pretty aggessive on axle weights and gross weight on an annual. Suzie has grossed 210,000lbs. With the C-series auxiliary and deep rears, pulling heavy weight isn't an issue. She consistently pulls 120,000+ gross without issue. As a 3 axle, however, with a standard frame, grossing heavy weight I prefer having axles underneath me. With slow turning rears, a high drawbar pull isn't much concern with the axles to spread the weight. However, with need for some more specialized moves where I need a minimal number of axles and the ability to frame load a tractor immensely, I recently bought a 1989 Mack DM686. It's an ex-mixer with a 20,000lb steer and 54,000lb Mack rears. 300 E6 with a 1071A. The last of the mixer gear will be stripped and a 20,000 lift added. The Mack, named "Victoria", will become my heavy four axle rig for local work. She won't be designed to go terribly fast, but, when we need to get a Metso crusher up narrow mountain roads or a full dress 349 CAT out of downtown, Victoria will be the unit to put high load on the power unit. I came over here hopefully to learn as much as I can about Mack's in general. I'm reasonably knowledgeable about Paccar and Cummins products, along with Eaton and what have you, but, I'll admit to more limited knowledge on Mack's. It's not a distaste or prejudice against Mack. I've never had a particular dislike of Mack, I've driven four or five and they've always been good trucks in my estimation, I just haven't been around them as much as other equipment. Anyway, that's things in a nutshell. I also own a 1997 Freightliner cabover, the first truck I bought as an owner-operator. 460 N14 that spun a main and needs a line bore before running again. Much more a highway tractor than Suzie or Victoria. And a 1957 Autocar, Audrey, which is more of a vintage project on rainy days. Troy.
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