Mackpro

last 6 of vin 002691

Ok , your truck has the Maxilite rear suspension. With the truck on level ground, unloaded and no trailer. Release the parking brakes, dump the air bags with the switch, after they have deflated all the way, flip the switch and air them back up. Chock the front wheels. On the front rear drive axle on the LH side. Measure from the top of the axle housing to the top of the frame mounted axle bump stop. It should be 8 1/2 inches. Look at page 3 of the service bulletin and enlarge the pic of the ride height guage and you can see where you are to measure from.

Mack service bulletin on ride height. give me the last 6 of the vin and I can look it up and see what rear suspension you have and get you a better anwser on ride height.

sb136012.pdf

Also found this Email responce from Mack on the issue========= These parts are for CHUs chassis that may be experience a reoccurring resonant vibration in the cab while under load in mid to high-range gears. Typically the vibration is most prevalent at highway speeds (40-60 mph) when the chassis has to negotiate a grade or when full engine power is required. The reoccurring resonant vibration will occur in the cab and in some cases may shake the dash. The cab can be isolated from the engine vibration frequencies by the installing the following parts. See attached document "CHU_VibrationComplaint Resolution".

Found the Email from Mack about the vibration============== I received your voicemail regarding the CHU613_1219 unit with the vibration complaint. Jim Gallagher is correct we have seen this issue before in which there is a reoccurring resonant vibration in the cab while under a load in mid to high range gears (at approx. 40-60mph). Here is a parts list that you will need based on a 300mm frame and “AL” suspension (see below). If you have any questions – let me know.

Rear Suspension AL461 – AL401

300mm Frame

Part Number Qty

Front Cab Mounts 30QS4590M 2

Shelf Bracket L.H - 300 30QS4617M 1

Shelf Bracket R.H - 300 30QS4617M2 1

Upper Frame Tie - 300 30QS4619M 1

Upper frame Tie Bolts 27AM16 4

Upper Frame Tie Nuts 191AM4 4

Rear Engine Mounts 20QL414M 1

Front Drive Axle Seats N/A N/A

Rear Drive Axle seats N/A N/A

Edge Shocks 4000-60675001 4

Upper Sleeve N/A N/A

Upper Sleeve N/A N/A

Lower Sleeve N/A N/A

Thanks,

- Adrian

I'm cleaning out an MP8 EGR cooler today and tommorrow. At least with the ASET its easy to remove and clean. With the MP8 you gotta pull the turbo and a bunch of other crap!

I had posted last week about our deal with the vibration on our cxu and nobody had replied. I guess my biggest question i'd like answered is, how do you know if your air bags are to full of air? Can taking some air out soften up the ride some without throwing the drive shaft off angle? Thank you very much for any info

I wouldnt adjust the ride height unless you had the exact ride height measurment availible. There are at least 3 different height settings for the rear air bag height depending on the type of air ride. Its so confusing we have a service bulletin next all the different guages that we have for measuring ride height. On the CXU and CHU you dont shorten or lenghten the rod on the valve, you actually loosen the bracket on the frame that the valve sets on and you rotate it one way or the other to adjust it. Too much up or down and it will cause vibration and even possible tear the syncro out of the transmission. Eaton Fuller likes to deny warranty for syncro damage, they claim they can tell if it was caused by improper ride height. Your new CXU should have come with a Maintance and Lube manual, in it it tells some on the ride height adjustment. I will try and find the service bulletin and post it here. Also the cab air bags have a measurment too, I will see if I can find it. We had 3 or 4 CXU's and CHU's with the vibrations when new and we installed the new motor mounts, cab mounts and rear shocks. The new rear shocks were alot stiffer than the ones that came on the truck. I always wondered if when the shocks started to wear out , would the vibration return. When the CXU and CHU first came out we still had "Mack" engineers in Allentown, I was talking to one about the vibration and he said it actually wasn't the engine vibrateing, it was a sound wave put off by the engine under a certain load, the cab was absorbing the sound wave and causing the felt vibration, kinda like when your in your car at a stop light and the guy next to you has a loud sterio with giant subwoofers cranked up and you can feel it in your car.

Got your text last night but didnt hear the phone. As the other guys said, EGR cooler needs blowing/cleaning out.

My '01 has the 460, 2180B, and 4.17's with 11R24.5's. For the most part, I like it. Sometimes I would like taller gears....other times, I could go for shorter ones. It is a fairly decent compromise ratio. My only problem right now is the lack of boost, which means no power. New charge air cooler put in a couple weeks ago (old one was trashed...and had already been repaired once), and it still only pushes 23 psi. Gonna replace the turbo next...

4.17 gears were good in older Mack engines and even the new MP engines but the 2004 and up AI ASET in the CV, LE and MR's just didnt like them. RowdyRebel: Last week I was chase'n a low boost problem on a ETECH for almost 2 days. During test drives I could hear what sounded like boost pressure leakin off. Kept pressurizing different parts of the intake system and everything was tight(leakfree). I was fixin to replace the turbo when I climbed on top of the truck and put my hand over the exhaust pipe and could hold back the exhaust pressure with my hand. Pulled the muffler off and found the baffle in the bottom had broke loose and lodged sideways in the middle of the muffler stopping it up. Worth a look.

well i limped into mackpro68 with my egr clogged and other such unmentionables. i cannot praise this shop enough and a special shoutout for mackpro68. i have been to my local mack shop with various problems oh an amber flashing light for instance to be told oh that happens to them all its no problem. i visited another huge volvo mack shop who did find my problem but proceeded to violate and pillage me with the quote for parts and over $100 hr for labour. i declined and slowly made my way to mackpro68 where they fixed my problems with no fuss or pillaging. it would want to make one move back to the country and leave these city slickers and hustlers to their tricks. The quality of dealers seems to be a huge problem in the mack world. one would have hoped that volvo would have paid attention to this but i guess there is more money in volvos. i know there are quality mack shops around but from my experience here in the southeast they are pretty lame. sorry if this is the wrong forum to post this vent. i am truck trucking again until later.

Thanks for the kind words Kilo6. I wish I would have been able to clean out that EGR cooler but it was plugged solid. Cant wait to see if your fuel milage will improve and get above the 5.7mpg with the other things we did. Gotta get that HP muffler ordered for ya and cant wait to see the results.

When you get the decals on, take some more pics and post them as I want add it to my desktop background. Beautiful truck!

"Built like a Mack truck" might refer to a formidable person, but the tag is what Mack Trucks hangs its reputation on. The recognizable bulldog logo, likewise, reflects the strength and durability that the company's heavy-duty trucks are known for. Mack Trucks is one of North America's largest makers of trucks used in construction, heavy hauling, highway, and refuse work. It also makes powertrains, which comprise an integrated system of engine, transmission, and axles. The company leases, sells, and repairs its trucks in more than 45 countries through a network of approximately 670 sales, parts, and service centers worldwide. Founded in 1900 as Mack Brothers Company, Mack Trucks is a subsidiary of AB Volvo.

he Power To Haul It All With Cummins Grunt

Get behind the wheel of a Metro-Liner, Super-Liner or Titan and you'll find Cummins power providing plenty of motivation up front. Mack and Cummins have worked closely to develop premium Exhaust Gas Recirculation (EGR) power packages for the new breed - and the ISC, ISL, ISX and Signature 600 engines really complement the New Breed range.

The Mack MP8 and Cummins engines use the same emissions technology with a Variable Geometry Turbo (VGT) and a self contained, cooled EGR system providing reliability without sacrificing fuel efficiency.

And if you were worried about performance - don't be.

Exhaustive analysis, testing and real world operation over billions of kilometres have resulted in stronger power and torque curves, with improved throttle response and greater engine braking.

These engines keep Mack ahead of the pack in the high horsepower market.

They're reliable, they're strong and they're ready to handle future emissions levels without fuss.

Mack and Cummins diesel power - the industry's best technology for the future.

Cummins Turbo Technologies' VGT features a patented sliding nozzle design.

This is both simple and reliable in that there is only one moving part in the hot exhaust flow. Electronic actuation also ensures fast response.

Another feature of the VGT is that there is no need for wastegate adjustment because the turbo doesn't have a wastegat

It's nice to "copy and paste" all the nice things said about Mack/Volvo and their new engine's but if you had to work on them every day you would be singing and different tune. As I have said they are a good engine and have the potental to be the best if we can get some better quality parts suppliers and just a few small changes.

I don't. Didn't carry a camera with me back then. I did drive it several times and always got questions about the Lady Liberty on the sides. I didn't have many answers about it back then as it was bought used to fill a gap in the fleet at the time. It was only purchased because it was availble, not because it was a limited edition unit. I know it was sold to a small fleet in Lima, OH that, at the time, had several MH's and it was being run hard. Don't know if it is still running now or not.

We still have 2 Liberty Edition MH's around here. One runs everyday haulin logs. I posted a few pics on here several months ago. Years ago we had a Sturdicraft (furniture products) warehouse here in town and all they would run was Mack cabover V-8's. When it closed the trucks were all sold off and thats where these came from. A couple of there Cruiseliner V-8's were the last to sell and they looked better and newer than the MH's. Our boss has a red, white and blue 1976 Special Edition Cruiseliner locked up in a barn, its all orignal with low miles, dont know what it edition it was called though.

Mack should offer Cummins and other vendor components across the model range- the European "we'll make them buy our proprietary engine to get our truck" model doesn't work!

The only way Mack could survive without Volvo now would to use Cummins and /or Detroit engines, Mack or vendor trans and of course Mack or vendor rear axles. If someone could buy Mack from Volvo , ditch the MP engines and be like Peterbuilt and Kenworth. Mack would have an advantage over Pete and KW with having their own transmissions and axles. I feel Freightliner and International are not a threat to Mack, at least in our area. KW and Pete are our biggest competitors around here, they cant even give Volvo dump trucks away around here, dont know why Volvo even bothers building them. With all that said, our MP engines are getting very close to having all the bugs worked out and looks like it will be a great engine soon. Just saw a bulletin from Mack that says the MP8 with SCR can be bumped to 555 HP and over 2000 FT LBS of torque, but only in the Titan. I assume by useing the larger MP10 radiator in the Titan they can do this. We have sold 2 MP8 505HP and they guys love them, says its hard to tell when the trailer is loaded or not. I dont see Volvo selling Mack anytime soon though.

Let me start at the beginning here, first there was man...oops too far back lol.

I am running a 2003 Mack Vision (CX613 I believe) with a 460 and an Eaton 13. I run loads from Vancouver to Calgary and back 2 or 3 times per week. Not as fast as the guys with actual horse power but I manage to get there lol.

Tuesday of last week I was running on a flat stretch by Chase BC when I instantly lost power and the engine started making a loud whopping noise. Almost like a blown turbo or broken Jake.

Turns out the bolts holding the rocker shaft on broke on one end and the shaft bent. Mack knows they are a problem, there is a service bulletin on them from 2008.

After paying a mobile unit to come out, then getting the tractor to town then parts and repairs AND losing my load. This has been very costly, my problem is this though the shop doing the work has never worked on one of these and can't get the valve set right. They are setting it like a cat or ISX engine and it's not performing properly, I'm hearing a whop whop noise from my intake still and power is even less then before.

Is there a different way to do a valve set on these? Can someone lay out the procedure for us please? I wanted Mack to do the work but they can't look at it for a couple weeks and down time is a killer as we all know.

Any help would be appretiated, thanks guys

As FJH stated you probably busted a cermaic cam lifter, sadly it happens alot. When ever we have a ASET apart we put the newer style hold down bolts in. I dont remember the pre ASET (2003 and older) engines breaking but anything is possible.

And what is a "full load"? A 12 litre engine like the 460 is going to need some deep deep low gears to start 60+ metric tons on a 5% grade! Suffice to say, a highway spec 9,10,13, or even 18 speed would be marginal in a 60 ton+ construction application.

AI engines need to be speced almost perfect to get good perfromance. We have had bad combos like 8LL fuller trans, 4.17 gears and tall 24.5 tires. Finally had to change the rear gears to 4.64 to get it up and going. Tourque curve on an AI is screwy.

what tranny and rear gears do you have????????????????????

I hope he has 4.42 or 4.64 or he's in trouble from the start.

I would imagine the check valve they are referring to is the boost pressure relief valve mounted in the venturi pipe on top of the intake manifold. It should have a short length of hose attached to it that transitions to a steel tube connected to the exhaust pipe. Early on there were some problems with the spring wearing through the brass seat of the valve. The seat material has been changed from brass to steel, I haven't seen much trouble with these, but if your engine was putting out boost like you say it may have become stressed.

We still see alot of problems with the boost pressure relief valve, the screw on end cap on the newest style/part# seems to screw itself out and cause low boost. We screw in the end cap as far as we can and hammer/ping over the end to keep it from happening again.

Help! 2002 rd688sx triaxle has a T2110B TRANS in it now back end shot again. Boss is putting in a T318 have every part but the gear lever. H and H Mack says on backorder who knows when. The problem is with the vendor who makes them. The truck is in the shop now apart anybody have any connections for one?. Supposedly none in the country and you can't talk to anybody in corporate any more only email. Tried our connections in NJ and NY no luck. Any help would be appreciated would like to go back to work soon.

Cheers, Rob

Dont feel bad, I waited 3 weeks for some rod bearing for an MP-7 engine. Now have a 2011 GU with a bad dash display and Mack cant say when we will ever get one.

I drive a 2006 Mack Granite CV713 Quint axel dump. It has an AI375A engine with Allison Auto. I knew when I bought it that the auto would not get the mileage that a manual would get

but I didn't realize 4.5 to 4.75 was going to be my fuel economy. If I am standing on it all day I would expect those numbers; but I have made an effort to try and lower my speeds to

increase the economy with no sign of improvement. A friends mechanic recommends a new set of injectors that will increase the fuel economy as well as performance.I guess my question

is will this work? Has anyone else experienced this?

We have lots of CV dump trucks around here. With the AI engine the usual average MPG is 5.2 so your not off by much.

We are talking AC 460 Right?there are possible gains on older riggs! pre 2004

These were plain ETECH engines around 2000-2001. Trying to think if I have seen it on any ASET AC engines. Gearing and tire size is the only the thing I have seen help with power for the AC enines. Bigen (CHN AC ASET) said after we installed a coolant shutoff on his fuel heater for the summer his MPG and power went up?

I was wondering, what the effect on the performance of my 460 would be, if I did away with the muffler? I think I can try it without taking the muffler off and if I don't like it or it's way too noisy, I can go back and hook the muffler up again. Will my MPG go up or down, will it performed better? If anybody can help please let me know

Thanks

Larry

I have seen improvements in power on certain CX style trucks that had the muffler underneath the cab/sleeper. That style muffler seemed very restrictive. A straiht pipe was put in place of the muffler. The truck wasn't to noisy but the dual exhaust was behind the 60" sleeper and had tall pipes. A friend has a 2004 CV dump truck with a AI-427 and had all custome exhaust from turbo to exhaust tips. He had squeezed 5" pipe starting at the turbo ( hard to do in a CV, you now have to remove the turbo pipe to get at the #5 and #6 EUP) all the way to a 6" TEE then 6" dual straight pipes in place of the mufflers. It did run better but you couldn't listen to the raido or cell phone while goin down the road. After about 6 months he replaced the straiht pipes with mufflers but left the larger turbo pipe and Tee and said it still ran better than stock.

What year and model? Mack made the 427 from around 91/92 till 2007. Startin with the E-7 VMAC-I , VMAC-II, ETECH, CCRS, ASET AI and AC. Now the closest thin is the MP-8 425. All had good points and bad with some worse.

I was looking at a brand new 2011 CXU and GU on our lot and neither one had the air clutch assist on them. Guess the boss man ordered them without. Smart move.

I am searching for information on this type filter. It looks to be factory installed on this cxn613. I believe it is a aset engine (427). How often should this filter be changed? I had the truck serviced at the speedco a month or so ago and they told me they dont change those. What is this filters purpose? I have never seen one on my other trucks (detroits) but this mack I bought has one. I am starting today doing the service myself due to I had to go to 5 different oil change shops and nobody had all the filters. I refuse to use the service department at my local Mack dealership due to a recent problem I had with them in the past. If service was free, I wouldnt go there. Honesty and customer respect still means something to me. They do not know the meaning. But thats another issue.

Does Baldwin, Wix, luberfiner make replacements for these centrifugal filters? How do you change them?

Any info would be a big help.

Thanks,

AC

Change that filter ASAP as its does a better job at filtering than the 2 spin-on filters do. Its the best thing they put on a Mack engine.

Saw this on an old CH I was working on today.