67RModel

Is this really the 1st Magnum made or was that something from the previous owner's advertisement? I'm not disputing it or being critical of your work but I was just curious is all. 

4 minutes ago, Onyx610 said:

Correct, although you will find that as you go through the gears you will be at a crawl.

This is correct. If you shift into the "1st" hole with the deep reduction engaged then subsequently to 2nd then 3rd, etc. you will not gain road speed like you feel like you should and realize what your error is. I was told by an Eaton rep that it is not advised to run the transmission in any gear other than Lo with the deep reduction engaged. Something about lubrication and premature wear but I know of guys who somehow integrate using it (or maybe its using the Lo gear in high range) into their shifting routine in certain instances with no noticeable bad effects.

Does anybody have the part number for the panel/gauge light dimmer knob for a 1994 Mack RD? Also, what amperage should the panel light fuse be and what is the fuse number/location. I do not have a wiring diagram for this truck. Thanks in advance.

It can hurt to put a post here on the forum in the Classified section. Doesn't cost a dime to do so and it might catch someone's fancy here. I would have to think Facebook Marketplace is currently the best platform simply because of the sheer amount of exposure your ad will have to all walks of life. Another good option is the ATHS "backlot" classifieds as they end up getting published in the Wheels of Time magazine. Most of the traffic here is related to troubleshooting, wrenching, comradery, etc. but there is a large concentration of "Mack Guys" here so you never know..... 

It depends on how your CDL is classified: interstate or intrastate. If you have it classified as interstate they will revoke it if you don't get your medical card renewed. If you get it changed to intrastate you get no correspondence regarding medical examination. I can vouch for this as I have had it classified as both ways at different times. You can go to the DMV and get is switched for something like a $10 administrative fee. But if you have it classified as intrastate you better not get caught in a neighboring state without a valid medical examiners card. All they guys saying your license will get taken are probably saying this because yes that's true if your CDL is in the interstate classification. A lot of guys do not know you can get it changed to intrastate travel only. I'm not quite sure what the government's logic here is but if you are medically unqualified to drive a 80,000 pound vehicle I don't see how staying within any state's boundary makes it OK to do so.....

I think Zollner became or was bought by Mahle of Germany. If you go to a high quality machine shop that works on heavy duty engines they may have some old catalogs or may be able to find a catalog cross for the old pistons. All the machinists that worked on and overhauled those engines back in the 60s and 70s are probably long gone but there is somebody somewhere can probably find an modern replacement?

I just realized that the Detroit Pistons basketball team were named as such because they were started by Fred Zollner, who started Zollner Corporation as an OEM piston supplier to just about everyone (including the pistons you have there). If you google Zollner pistons all you get is basketball information.......Sorry I'm no help but somebody will be along here with useful information....

51 minutes ago, Ricky Beals said:

More than likely I'm going look hard at the 95 Mack RD that I uploaded photos on. It needs a lot of little things but I think its a solid mechanical truck. Frame is solid, needs tires all around. Going back out there today and lift the bed and go over it a little more.  Can buy it for around 12,000 and put some money in it and I thing may have an old workhorse. Any advice on checking those rearends or seeing if there is trouble in that area?

Probably not a bad decision. Lets face it; in this category of truck no matter what you look at is gong to need a bunch of little things addressed sooner or later. As long as the major mechanical components are solid you should have a home run at 11 or $12,000 if your budget was $35k. Leaves a lot in your pocket for immediate maintenance and/or repairs. Being that the truck is from the south and never left a gravel pit the chassis should be absent of any corrosion or winter/salt damage. This makes maintenance so much nicer in my opinion. Also I see it has a fully mechanical E7, which is pretty much the pinnacle in my opinion of Mack engines. If it has compression and fuel it will run. No nanny electrical wizardry. 

11 hours ago, Joey Mack said:

I remember trying to shift the range box and the main box to use 7 gears..  It was cool, took a lot of practice, and of course some grinding. but I kept trying even though I was never really needing to do it.  I did however use 1st gear low, then shift the range box to high then go through the main box gears, and sometimes I would be in 2nd in the main box and low in the range box, and do the same thing. 2nd lo-2nd Hi, then 3-5..  when I tried to shift 1l-1h then 2l-2h..  I found myself triple clutching..  I was a nut..  No-one trained me on it, I was just self teaching/taught...  luckily when I was doing this I had several sand pit's to practice in, and when I messed up, no-one was around..   If I found a twin stick "R" series that I could afford, I would buy it,,  just for the heck of it...  jojo

Joey isn't there some quirk about the twin stick 6 speed about not being able to move the truck while the PTO is engaged? If I remember correctly the auxiliary transmission has to be in neutral for the PTO to operate and you have to select a gear in the main box that gives a desirable PTO speed? This makes "tailgating" material with one impossible. Am I thinking about that correctly? If I am right that is literally the only drawback to one of those units. They are the quintessential Mack vocational transmission that pretty much cemented Mack's reputation as a "work truck".

11 hours ago, Ricky Beals said:

How would someone even get a truck like that to Arkansas?  It’s 11 hour drive from here so no way I’m driving it back.

If your not driving it shipping would be the only other option, which is an exercise in pulling your hair out if you don't personally know or have experience with a reputable transport person/company. You can create a load on Uship.com and about a zillion brokers will contact you with a price to haul it to your location but its a literal coin toss as to whether you are going to get jacked around or not.  All the brokers that deal in one off loads like that promise the word and usually underdeliver or just don't show up because they weren't able to work it into their schedule after they told you they could. Then you are sitting in Arkansas and your $20,000 investment is sitting in some stranger's lot in Pennsylvania. Personally, I would not recommend going that route.....

1 hour ago, Ricky Beals said:

How do you shift a twin stick? Go to neutral with gear shift and then shift to high from low and then shift to fifth?

It’s a 5 speed just like the 2070. The far right stick is the auxiliary. It has low direct and reverse on the right stick. Start with main box in 1st and auxiliary in low get moving and shift auxiliary to direct. Then you just shift the main like a 5 speed. Then for reverse you put the auxiliary in reverse and you have 5 reverse gears by selecting any gear on the main box. The auxiliary low is only used when the main is in 1st so it’s a 6 speed forward and 5 in reverse. The auxiliary low is only used in situations where you would use your two creepers in a 2070. Very robust and indestructible unit and excellent for dump truck work.

4 minutes ago, Ricky Beals said:

 

I don’t want to be banned from site but could someone educate me in what model International I should be on the lookout for? Seems like most have cat engines. Wouldn’t hurt me to gain a little more knowledge in this area.

 

The international equivalent to Mack RDs and DMs are Paystars. Very heavy duty trucks with either Cummins or cat power. Most have Hendrickson walking beam rear suspension which is just about equal in articulation and durability compared to Mack camelback. All the same rules apply to inspecting the truck as you would a Mack there’s just a different emblem on the hood and a different color paint on the engine.

20 minutes ago, JoeH said:

Kenworth dealer near me deals in used trucks too. They'll take a whole lot of older trade ins from large construction companies/fleets in the area. Tons of the trucks are in horrible shape but there are a few gems.  We bought one about 3-4 years ago. Plow truck, had the hydraulics and everything still.  Brand new double frame, probably 5 years old or newer.  Engine fires up like it came off the assembly line yesterday.  It's a 1988.  Even the hood looks new.  Probably a million or more miles on the truck, but there's no way to know.  There are good trucks out there, you just need to go look at a dealer with a whole lot of trucks. Keep an open mind!

This. I found a truck at an independent used truck dealer that deals mostly in late model off lease trucks and trucks from rental fleets I assume. The truck I found was barley advertised and stuck in their back lot where their old inventory goes to die before being exported. It just didn’t fit what their typical clientele purchased. I asked them to send me a bunch of pictures of it and came to realize it was a gem. Made the trip down there to look it over and realized it was a extremely nice gem. I was able to decipher the old DOT number and looked it up. It was an one truck fleet excavation owner operator. I contacted him and he told me he bought the truck new in 1994 and drove and maintained it himself. The 335k miles are indeed accurate and that his tax man told him he needed to spend money at the end of 2019 so the old Mack got traded in. It’s in amazing condition for its age and I was able to get it for a good price because the dealer I bought it from didn’t think they could move it to they people they typically sell to. They are out there you just have to look long and hard to find them.

I mean this truck has been advertised for quite some time and has a very recent inspection:

https://www.facebook.com/marketplace/item/303868681768819/?ref=search&referral_code=marketplace_search&referral_story_type=post

not as new as what you have been looking at but certainly a lot of good life left in her. Especially since you say you mostly are going to use it on your property and local deliveries. Could probably pick it up for a good bit less if you flashed a bunch of greenbacks at the owner.

Yea its kind of a shame a lot of independent dealers are so deceptive to try and make their equipment seem worth their asking price. I don't know how it is in Arkansas but up here in Pennsylvania there is mountain of good trucks for what you are doing for sale on Facebook. Old Macks everywhere. Some better than others but you can find something suitable for what your needs would be anywhere from $15-$25,000. Have you looked at brands other than Mack to maybe increase the amount of suitable candidates within a close distance?

I wouldn’t normally post something like this but being that it has a 500hp E9 I figured everyone here would like to see it. Pretty ratty looking truck but everyone seems to like the v8s. No mine just thought I would share it.

https://www.facebook.com/marketplace/item/2150701791754256/?ref=search&referral_code=marketplace_search&referral_story_type=post

Given the strong market for just about anything with an engine right now I would guess at least $12,000. Especially if there is online bidding. Good condition older equipment sold at farm retirement auctions seem to bring a premium amount these days.

12 minutes ago, VintageSmoke said:

You know what the "S" is for?

In non fire apparatus speak an "S" designation signifies a tandem rear axle. It probably means the same thing for fire trucks but I'm sure GA_Dave will clarify. This makes sense given a modern single axle was installed in 1995. A tanker in fire apparatus speak is just that....a large tank for carrying water to a pumper unit to use. They are used extensively in rural areas where there is no city water supply or fire hydrants to connect a pumper truck to.....

On 1/20/2022 at 2:20 PM, skydawg said:

I`ve gotten a bewildering array of quotes from Uship,Mercury and others

Just curious if you don't mind someone asking what the range of quotes are. Did you specify lowbed service or are they wrecker quotes?

I'm not up on B model terminology. Would the Cummins be original or is a B61 supposed to have Mack power? I know some of the higher numbers in the B lineup had Cummins power....B73 I think.

5 hours ago, rickm688 said:

Pulling a tri axle trailer …. 24.5 tires on truck and trailer … 

Its tough to know without knowing as they say. Maybe take your current setup to the scales and see just how much you typically put on your drive tandems. I guess it depends on how the trailer is loaded but my guess is you are either right around 38,000 or a little over but no way to give a definitive answer on here.

My 1994 RD690S is a monster single frame, which is one of the main reasons I bought it. It was originally from Virginia and a one owner unit with low miles and no frame rot to speak of. The Maxitorque T2060, 2070, and 2080 all have a 0.6:1 overdrive to get road speed out of the very slow rears they had in them. An Eaton trans will have a 0.71:1 overdrive and the rears will be somewhere between 4.17 to 4.88:1.

50 minutes ago, JoeH said:

Or not. Looks like the engine # is labeled in the cab too...

Yea I was going on the fact that its a RD690....690 indicating a maxidyne engine. When trucks get to be this old and passed through many owners anything is possible though.....

It worked for me. Looks like a decent truck. Just looking at it quickly it doesn't look to be in as nice cosmetic or maintained shape as the 2000 you looked at earlier but that doesn't necessarily mean this one is a bad egg by any means. Some pics of the frame rails and chassis condition would be a good starting point. The Eaton transmission may be a transplant. An EM7 (Maxidyne) engine would have most likely come with a Maxitorque transmission. The Eatons were usually paired with an E7 350 or E7 400 engine.

42 minutes ago, 880joe said:

I would think it would depend on how much weight you're carrying on your drives. Are you carrying 99000 on ten wheeler or pulling 5 axle trailer. I didn't think as far as the actual gear set their was any difference probably just crd 92 & 93 gear sets

I was going to say this. I know in Massachusetts you can gross something like 100,000 on a 5 axle combination. The most you will probably get on the steers is 14,000, which leaves 85,000 total and around 43,000 far each set of tandems. So in this example 38,000 rears would be pretty undersized. Now if you are pulling one of those Michigan specials with a bunch of axles on the trailer to shoulder the weight, the weight on the drive tandems may only be around 34,000 or so in which case you would be fine. I always though the rating of the rears was the weight carrying capacity of the axle set. I don't think it has any reference to the amount of weight you can gross on a combination setup. Plus you say you are just rolling down the highway with it.....not a really demanding use case.