Moparmike

Yes I understand that that's why I said I may be  asking a bite much out of it but on a different note I also have a freightliner with a 280 Cummins 9speed 68000 gets 6.5 no problem at all.... but I believe I got more when I first got the mack just can't remember I usually keep up with this stuff to check back on ..I've talked with mack about a little bump in power they say if mack approves of it I think it was like 179.00 to hook it up..but for the most part I'm loving the truck looking at 1 more 2000 now..

Ok guys I think I should be getting better mileage then I am ..run down 

E7 300hp

6speed auto

Quad axle dump truck 

Tagged at 71000

Run 68000 most times filled up 90gal had to refill after 450 miles 5mpg 90 gals..

My other truck rd690 e7 400hp 8ll

Gets 6miles to gal.and empty its 3000 lbs more the the 688s..am I asking for to much with the little hp..new air filter going to change fuel this weekend ..going to get valves sets check fuel pressure anything you guys can help with ..thanks..

8 hours ago, fjh said:

Bud thanks for keeping us up dated Good find!

Ended up being both injector and eup replaced both runs great now..number 1 cylinder 

Update on e7 ..number 1 injector hung wide open ..picked up parts Friday hopefully ready to go monday

Ok little update today..mechanic cracked all injection lines all are pumping fuel last 4 cylinder are cold ..towed to his shop going to put a test ecm on see what happens may put manifold and turbo to see really what the cylinders are doing ..hopefully ecm will fix the problem 

Not to sound crazy but could someone tell me how and where to check the pressure this is my first Mack..never really messed with them before..ive put a turbo on it bout a month ago that's it lol..thanks 

Driving the dump truck today out the blue starts to smoke white smoke skipping running rough..tried the codes i get 6/6 fuel control module but if that was the case would the truck run at all..how can I check the injectors..it has the eup injectors as well as the others i guess is a good way to word it..

Thank you ill try it this weekend 

Ok guys went had both my dumps rd688s and rd690 a.c. service 688s blows but not the best 690 does not blow cold at all..both was charged and checked by a shop so I'm thinking that the units are dirty and need cleaning from dust and whatever else..so my question is where do I start and what do I need to remove. To clean the evaporator coil..

When I'm driving temp goes to about 185 190 when I stop in less then 5min.later it's under 180  maybe 150 ..any idea I'm thinking someone took the thermostat out ..

2000 rd690 e7 300hp Allison automatic quad axle dump 68000lbs

Mine was leaking air so I took and folded the line and tape it til I got the new 1..i don't use mine much anyway dump trucks hauling asphalt mostly 

https://m.ebay.com/itm/Mack-Dash-Switch-Blade-Style-Air-Electric-Velvac-032227-FREE-SHIPPING/302361940945?hash=item46662d13d1:g:~ZoAAOSw8GtZUAyM

I got 1 off eBay for bout 20.00 shipped I believe..

Llooks to be 1990420 model 

400 series 

Sorry didn't know they had so many..

Anybody  have a  part number for just the silonaed...mines took a turn for the worst..nolt that wires hook to is loose can't tighten it up ..voltage all over the place..

Ok guys new turbo here ..so a few questions before I try to start it up.took air cooler out cleaned it out oil line cleaned going to pour oil in turbo before I start it to ensure it's not dry..change oil and air filters along with oil..anything else I need to look for before starting it up..im sure it's going to smoke like crazy...

Ok what's that not being funny I have no idea lol..also would this make the truck idle low burn a little more fuel them normally..my other Mack e7 400hp 8ll gets bout 6.5mpg this truck e7 300hp auto gets bout 5.5mpg and idles at 450 instead of the 650 the engine tag says ..450 is kinda rough 650 smooth..is there away to turn the idle up with hooking it up to the computer..thanks sorry for all the questions jyst looking to get this truck inline 

Any help with this please..light comes on for a few then goes off ..

Ok guys do I look it up by s400 or s400so69..I'm new to the turbo part lol sorry..if anybody has a link to them be great..

Ok guys I really need help today out of no where turbo took a turn for the worst..Mack wants 1900.00 anybody know a better price place to get 1 ..also it tried to run away but let off the couch and shut it down very fast still has oil in the pan.. anything I should look for..

I apologize it's clear fluid 

How can I tell which fluid is in it..the fluid is red doesn't smell burned or anything..i just purchased it back in November 17

2000 e7 300hp Allison auto what's the maintenance requirements on the trans truck is new to me so I wanna try to keep it up..also what fluid it use I'm sure Mack will sell it just trying to see if I can get it a little cheaper if possible