DaveM

Sorry, yes it's a T310M in the 08. It seemed slower in LL and LR than the 8LL did but they are still a lot faster than my old 79 2 stick DM. Backing equipment it helps me to be able to go slow at times. More of the story. Mack sold 08 new and has done all of the service work other than brakes and such. I pulled all the service records and it has been pretty minimal other than replacing both rear chunks in the last 5 years. It has 218k miles on it. I was going after the 2000 until I raised the bed and looked. Both rails are jacked from the cab to the tail. I am talking at least an inch gap between the top flanges of the rails. looking underneath from the back the frames look like a snake crossing the road. There are not any cracks in the frames yet but I don't really see how. I considered getting it and finding replacement rails then noticed these newer trucks weld the bed pivot points to the main frame rails where my 79 has a separate bed frame with the pivots that attaches to the main frame. It looks like a chore to swap rails in one of these newer trucks. Don't laugh but I noticed a big ugly silver canister thing under the passenger side of the cab. The sales guy said that was the DEF apparatus so I asked where the DEF tank was. After some "research' on his phone the answer was it is for emissions but DEF did not get added until 2010. Yes it was 2 people that don't know what they are looking at trying to come up with an explanation. Still waiting to see what they are asking for the 08. It may be moot in any case if they are not reasonable. I can't see the 2000 as an option now with a bad frame and 800K on everything else.

I went and drove the 08 around this morning. It actually has a MP8 engine and a T300-M trans. Got to say I think I like the T300 better than the 8LL for low-speed work.

I have been looking for a dump truck and found a 2000 RD with a 350 hp, 8ll, no pintle setup. While I was there a 2008 came in that is also for sale. Didn't get details because I thought I was not interested but thinking more about it am I? I know it's one owner in very good shape with 260k miles and is set up for pulling a trailer which I need. I have been looking for a pre 2002 truck that was Mack and pre-emissions. It is my understanding in 08 the motors went all Volvo. Any opinions on the 08 vs the 2000? Thanks, Dave

Hey guys, Still looking for a truck and ran across a 2001 RD690S. Question 1 The VIN is 1M1P270Y71M055417. Looking through all the info I have found it looks like the Y in digit 8 indicates "Class 8 GVWR Truck tractor with air brake system". Does that mean it started out as a road tractor and was converted to a dump truck? If it was a C in the 8th digit it says "Class 8 GVWR Truck with air brake". If it was a conversion are there any red flags to look for? Question 2 Really confused about RD688 vs RD690. From what I have read it was used to indicate Econodyne vs Maxidyne and the typical transmissions used (with Maxi's using a Mack trans). Was this still true in 2001. This is a RD690S with a 400hp Mack motor and a Fuller 8LL trans. I thought 690's had Mack transmissions in them. Thanks for you input, Dave

I am in Knoxville, TN The posting you listed is the CH truck I looked at. They also have some RD’s. I have been looking through sites like Truck Trader, Machinery Trader, Rock & Dirt, Richie Bros Auctions, Pro-Team Auctions.

In Response, It does have a Brake Switch Labeled "Trailer Supply" but also has air connections at the rear for pulling a tag-along so I am not sure when the switch was installed. There is also a toggle switch labeled Suspension Control "Trailer Coupling or uncoupling" up position - "Normal Vehicle Operation" is down Thanks for everyone's input I think this CH will be on my naughty list. I am looking at RD's and CL's now. There seem to be some RD's out there but a lot are up north. CL's must be specked heavier - most of what I am seeing are 5 axle dumps. If anyone knows of a decent pre-2000 truck with LL trans and pintle hookups... just saying.

Thanks for the response. It has a Fuller transmission and a 350 hp engine. What should I be looking for? Another DM?

Thanks for the responses. In reply, The truck has a double frame It has 10 lug Dayton rims on all the axles I believe the front axle has 3 leaf springs. Listed as Front Axle Weight (Incl. Twin Steer Axles) 16,000 lb Rear Axle Weight (Include Lift Axles) 40,000 lb Don't have the VIN yet. I almost hate to ask but would my 2 stick bolt in to replace the 9 speed without a lot of mods?

I am looking a getting a replacement truck for my 78 DM685 and found a "low mileage" 95 CH613 Tri-Axle. I went to look at it and sure enough the odometer shows 270,000 miles but then the hour meter says 28198. 28 thousand hours seem a lot to me for a 270k dump truck. Is one of them lying? I pulled the oil filler cap and with it idling there is just some little swirls of smoke coming out. Nothing bad and no air volume. 65 lbs of oil pressure idling. Starts quick and I think it sounds Ok. Are there other indicators to look at for what the actual hours/mileage wear would be? Concern #2 It has airbag suspension. Is that good or bad for a truck that will be in the dirt a lot? I was told if dumping off-road to deflate the bags first. True or false? I have only run camelback suspension and have no background with air-ride. Concern # 3 It has a 9 speed with Hi-Lo but no Lo-Lo. Does a Lo-Lo make that much difference. I also pull equipment and wondered about backing up trailers. Having never driven a 9 speed I am not sure how low the gears are. With my 2 stick it had 5 reverses where the 9 speed has 2. The kicker is I was not able to test drive the truck when I was there because they were doing some welding on the bed. Concern #4 (Sorry) My 685 has a Jake and the CH does not. Is that a concern or do the newer motors have the ability to help slow the truck down? How about shifting with a Jake which drops the RPM really quick vs a CH without one? If Jake-less is a issue how bad is it to install one. From what I saw available online it looks like a couple of bolt on parts and some wiring/switches. Thanks for any input.

I see this topic has been open for a while but hope someone can answer a follow-up question. I have been running a 1978 DM685 tri-axle for the last 30 years and it looks like a replacement is required. Looking online produced a 1995 CH613 that may fit my bill. My question - is a 95 on the good list (mechanical) or the Ok list? How many miles/hours are typical before a rebuild on the E-7? Talking to my Mack service manager he said to stay away from 2003 - 2007 (06-07 in particular) but I didn't ask about a 95.