Lmackattack

https://acrobat.adobe.com/id/urn:aaid:sc:VA6C2:8514a9b0-d0b5-4f41-b644-5b8fb227c70e If i'm understanding you correctly. You ran a seven wire cable from the firewall junction block to the rear end of the truck frame. My R model. only needs 4 wires to the rear of the truck

I might be mistaken but I thought the frames from a RW700 were the same as a CL700? I have not owned either so someone other than me please confirm

Thank you for looking this up.

I listed the vin tag in the first post. I have not looked for a hp tag on the engine. All I know is these were originally to be sold to ABC building supply but the deal fell thru and they got a good deal on a batch of these after the frames were shortened for use as a tractor.. I'd suspect it was built as a cheap low hp fleet spec truck design to Hau maxl 50k gross.

I recall that thread now but I was not driving this truck back then so I was not following it closely I got to the end reading it. seams like a wealth of info to improve these engine......and have to ask, what did Mack Technician do to be banned? Did he ever return here under a new name? Thank you

Thats how this truck drives. It has nothing down below 1350 and not alot after 1900. To drive this thing I try to rev it out just past 2000 rpm because with this 10 speed, when I make my up shift the next gear goes in at 1350-1400 and it will be in its "power" band. It just struggles to accelarate. I did 5 loads in 10 hrs 230 miles total the other day and it burned 82 gallons of fuel. thats 2.8 MPG. horrible!!!

Thanks for confirming I have one of Macks Worst Engines LOL. From the sounds of what your all telling me. its doing perfectly fine for what it is. SAD!

I think I was at Walcott 2005? and thats where I remember seeing it. It might have been the superliner but I just cant recall

AMIs??? what is that????

sounds like its backfeeding the air. If the check valve is faulty that can be a reason and likely a cheap part to throw at. Im not very good with air brake systems and on a old truck who knows whats been changed. like wise you can test the check valve to see if air flows in the correct direction before replacing it but it might just be smart to replace it simply because of its age Just another thought I remembered. I had to replace a dash valve 5 years ago on my R model because it was leaking. the valve just failed because of age well.

I think the revolver knob was given to me by Rob Swallows (BMT member "Rob") Its been on the truck for 20 years but I have a hard time remembering yesterday

It definantly looks like the piston is missing from the shaft. the spring looks to be in the released position as that spring pushes back to release the Power Divider when air is exhausted.

Thank you!!

I recently started a new job driving.a 2007 Mack Granite tractor pulling a end dump. 73k one way empty on the way back. This thing is getting horrible fuel economy. I'm getting on average, about 3MPG daily. The truck is a gutless wonder, and because of that, i'm full throttle, most of the day just trying to obtain and maintain 40mph speed limits. The lightning bolt is illuminated on the dash and people are telling me it's because the fuel gauge isn't working. Not sure.If that's the reason so i'm wondering Is there any simply way to read the code? Or am I looking at the Vin? Can you tell me what engine/hp rate it is. I feel sorry for anybody that owns these junks. The other trucks in the Fleet seem to suffer from the same poor mpg and no power. An old R model would run circles around this p.o.s

from what I can tell in my search to see if my 1977 285 tipturbine was ready for a Mack dynatard or if I had to find a jacobs brand. If you engine was built before 1980 or 82 (cant recall the exact year??) your engine tag needs to read ENDT676"B" for it to have a dynatard cam factory installed. If there is no B in the Engine code you likely do not have the dynatard cam factory installed and you probably need a Jacobs kit instead. I do not know if the jacobs brand kit would work with a dynatard cam.

there were tons of them out in California hauling two 2 single axle pup dump trailers. they have some weird weight laws out there making this a common set up for them

a little bondo and it will be straight as an arrow.!!!!! Cool Find of a rare Mack model.

off topic. how is Norm doing. I have not spoken to him in a few years now. my last visit with him was probably 8-10 years ago now

the air pressure needs to be above 60 psi to be pushed in without it trying to pop out. I think the actual pop out psi is closer to 40 psi but I always wait until 60psi to push them in that aux valve needs to be traced to what its for. Like I said most R models had a blue vlave for tractor parking. If the yellow is pushed in first you had to make sure you pushed in the blue as well. In this photo the 3 valves from left to right..... trailer supply......truck trailer parking........tractor only park

I was one to always say keep it original and such but now im 20 years older and I feel that is not always the best advice anymore. These days I would recommend a air ride that is tried and proven. If a hobby truck Airliner is one of those options many have looked too simply for cost to buy used and cost of repair. Parts are easy to come by and the ride quality is good. only thing I would say is to make sure it has locking rears for when you are off road. If this is a dump truck you may look at Hendrickson HAS40K air ride for heavier speced axles I use to swear by camelback until I drove a properly speced air ride dump truck. The pete I was driving with air track / Locking rears was much better than the camelback I was use to. sure you could louse traction if you did not put the power divider in but if you locked in it would just walk thru just about anything. With macks auto power divider you never knew if the power divider was truly working or not and you still did not have a rear axle lock so at best you had 2 wheel power and 2 wheels spinning. with manual power divider and locking rears you have 3 wheels of power and only 1 can slip. But im getting off topic now. What ever you chouse just make sure you know what your buying but I suspect anything air ride will be better than the ryco spring suspension

I wonder if these modern 34k axles are diffrent than say 40k axles. If I recall right back In the R model days the 34k camelback was cast round tube and the higher capasity rears were welded square tube.

what is the aux valve you speak of? Most macks had 3 buttons blue= tractor only yellow= parking (both trailer and tractor) red= trailer air supply If you are dropping to 90psi when you push in a button Id check the tractor protection valve or the brake buttons first (Primarily the yellow and red buttons)

From what I see 34K camelback rears did not have transverse rod. everything over 34k I think did have one. Not sure on newer macks if they even offer 34k anymore? regardless the transvers rod deffenatly helped keep the axles aligned as now the axles had 3 points of contact to prevent side to side movement. the down side to the transverse rod is it puts alot of stress on the upper diff housing. some guys say over time it can make your diff bolts loosen up and thus leak oil. also your diff needs to have 4 holes drilled into it so that it can accept the bracket to recive one end of the rod. I think the rod is still better than not having one.

that would be interesting to see how it comes out . the R model hood is going to be too narrow for starters. Maybe a modified superliner would be a better starting point but you would still have to modify to hood to meet the cowl to look anything like a truck

Very cool truck. Definitely Looks like it was set up for a heavy spec. Those are older mack rear axles with newer style top load differentials. Never knew you could interchange them. If the stamped ratio is correct, that's a 7.00 ratio. You can check by lifting the rear up rotate drive shaft and count how many times the shaft turns to get the wheel to do 1 full rotation. Obviously all those aftermarket air assist steering and filter housings etc are add ons. It definitely has character and somebody enjoyed improving it thru the years.