Mackpro

I have seen alot of Mack CX's and CV's with 20 amp breakers for the headlights but when I pull out the wiring diagram I notice it says "20/25 amp" so I have been replacing the 20 with a 25amp when ever we have any issues, dont know why the factory didnt put 25amps in all trucks to begen with? Also almost all CX and CXN's have the Federal recall for the headlight switch jumper harness. Its a jumper harness that goes in the dash and has 2 relays in it to take some of the load off of the switch. Over 2 years ago I was involved with the Mack engineers about a 2005 CXN that was having headlight switch problems and they used our truck for a "Guinne Pig" and sent us the homemade jumper harness, this fixed our problem. There are 3-4 different jumper harnnes , the one for the early CX's have yet to be delivered to the dealers.

For dump trucks and off-road the Mack rear-ends are the way to go. On road or over the road the Mack rear ends are way to heavy. I love the Mack rear-ends more than any other but when we spec out trucks and the customer see the weight difference the usually go with the Eatons or Rockwell/Meitors. And Mack wont let any HP bigger than 427 with the 93/93 carriers, if the customer wants bigger HP they must use 200 series Mack or vendor carriers/axles. The 200 series are even heavier and more $$$. I was doing a HP conversion on a 2003 CH613 355/380 HP going up to a 460HP and Mack didnt want to turn on the download because the truck had 92/93 carriers/axles. If the new Mack carriers are as light as the vendor carriers it will be a big hit. I hate doing the warranty on vendor carriers, Mack warranty is much easier to deal with.

Hopefully they will send it to somewhere with a dyno. Thats what our DSM said to do and he paid for all of it.

Every new truck we sell, we make sure it has the "Guard Dog" display on it. It dosent cost very much to add as an option when spec'ing a new truck. I think its $300-350 which is cheap when they truck cost $100,000. We had a guy want to add it to his CXP that he bought from another dealer and parts alone cost almost $1000 + labor to install. It's nice when a customer is out on the road and the EML (electronic malfunnction light) comes on he can call us and read out exactly what the fault is and we can get ready or order parts for possible repair while the truck is on the way in. What I like is the customer can see exact MPG instead of him trying to figure it out and being wrong then blameing the truck by forgetting to include all the gallons he burnt while idleing at the truck stop and ect.... kinds puts a stop to the complaning as we have never had a low MPG complaint yet with the "Guard Dog"

Around 2001 and up there was a Co-pilot like screen ( mostly on the CX Vision)on the RH side dash panel (I cant remember what it was called). With that system you could set your own road speed if it was set up correctly by the Dealer. We did have alot of issues with this type system. The screen would blow sometimes during jump-starting when low batteries. I dont know on the old Co-pilot (sat on top of the dash, VMAC II around 1996) and the new Guard Dog (MP engine trucks).

Just had an 09 CXU using lots of coolant, the harder you used it the more coolant went missing( up to more than a gallon a day). No external leaks at all. Finally found a cracked EGR cooler. This is the first we have seen of this problem on an MP8, hope its the last.

2001-2003 non-ASET are good, 2004 CH and CX with ASET no-no, ASET engines do get better in the CXN-CHN framed trucks starting in 05. I prefer the 2002-2003

We finally got our EUP's in, they actually came in early. We are now waiting on MP8 turbos(recall) and MP7&8 front crank seals( have several leaking).

The AC supposed to be the highway engine and the AI the vocational engine. But due to the 2004 AC problems we had (till the "N" model large Volvo frames came out(CHN/CXN)) alot of guys ordered light weight CV's with AI's and air ride and put 5th wheels on them for gas hauling and local runs. This got around having to use the AC engine.

That cheap compared to a 04 and up Ac ASET turbo $3,000+

Its the electronic unit pump. All ETECH style engines have 6 of them . They all look exactly the same but there are 3 different part#s due to the ETECH 98-2001, CCRS 2002-2003/AI 2003-2007 and the AC 2004-2007. You can actually mix them all up and put them in different engines and they will run but not good(low power). We went to our independant pump shop and they could rebuild our EUP's but cant get parts from Bosch.

Mack says it's Bosch's fault, but that dosent matter to the customer as his truck is setting here with 2 bad EUP's.

Try an order a EUP for a 2002 CCRS etech or 2004 AI ETECH 1,500+ on backorder and no shipment till after newyears. We are robbing our junkyard engines to keep our customers going.

Even the MP engine parts can be hard to get. A new recall just came out today on all early MP8 turbos. Found 5 of my customers needed the new turbo. Went to order parts and a big"0" on the turbos. Why issue a recall on turbos when you dont have any?

Also does it have a auto shift or ultrashift trans? If so the engine brake will engage to help the trans shift even if you got the brake turned off.

If the engine has the "powerleash" engine brake, the o-rings on the engine brake solinoids could be bad/cut and causing oil leaking into piston area and slightly applying brake. We have seen this before quite often. As far as the low power, read some of the posts on the 460 HP CV's and about going to the dealer to get both ECU's reflashed with the new software for poor throttle responce. Need last 6 of the vin and I can tell you if it need the new software.

I think if it dosent have a "red" motor in it MACK/VOLVO dosen't care if you get parts or not.

There are 3 different EUP pumps. A different on for each type of engine, ETECH, CCRS/AI ETECH and AC ETECH. You have the the AC version. Hope they have them in stock. The EUP for the AI ETECH is on backorder, 1,5032 are on back order and we have a truck with 2 down and wont get one till after new years. Truck still runs but has codes and a rough idle, going down the road , its OK.

Have them contact their "Distric Service Manager" DSM and he can get somethings done. We had to do this on a truck with low power. Our DSM let us take truck to a Dyno shop and see the real results on paper. Truck should put 80 to 75% of rated power to the ground. Engine usually lose 20-25% through the drivetrain. Our truck had bad injectors and was 6 months old with less than 30,000 miles. Call Mack and complain- 18008661177

It's OK for the oil temp to get as high as 250 with no effect on power. Mack has a service bulletin on this. Is fan clutch stayin on all the time?

We have been buy all the Flying J trucks we can find. We have been flying our guys to to Salt Lake City and all over to pick them up and bring them back here to fix up and sell. We also bought a fleet (17to 22 trucks) that are just like the Flyin J trucks, they came from Florida. We have sold almost all them. People here just love the auto and ultra shift trans. We like to get the 2000-2003 trucks to sell due to pre-EGR engines. These trucks are getting hard to find now ( at a decent price).

Whats the last 6 of your vin and I will compare the software it to whats in my friends 6 CV's that are 2007 460 HP's

I just call Mack Tech Support and give them the model and last 6 of vin and tell them I want the throttle responce software and datafile, and they turn it on in the mainframe, then I shoot it in the truck. Dont really have a part# of a file that I ask for, however I do hear the talk about a "step 12B" program.

We have seen it alot. The fan ring part# has been updated 3 times however it dosent say if it was improved. The warranty is only 1 year/100,000 miles on the fan ring so most guys just make some oversized plates and sandwich them over the fan ring and use longer bolts. There is a Mack service bulletin on using longer screws but this has nothing to do with the ring itself breaking around the mounting brackets. This has been a problem all the way back to the early CTP's and CXP's with the first MP7 engines.