Jump to content


Pedigreed Bulldog
  • Content Count

  • Joined

  • Last visited

  • Days Won


Mackpro last won the day on January 12

Mackpro had the most liked content!

Community Reputation

417 Excellent


About Mackpro

  • Rank
    BMT Certified Know-It-All!

Profile Fields

  • Gender

Recent Profile Visitors

14,006 profile views
  1. Power comes through fuse 39 in the fuse box on the fire wall , then through the trailer ABS relay that’s in the same fuse box . Power comes out of that relay on wire # 39-B-5.0 that goes up to the trailer buss bar, then it’s connected to the blue wire that feeds the trailer
  2. On common rail engines, there is a electric fuel pressure solinoid on the end of the fuel rail under the valve cover . It was a common problem and we had all ours replaced with a new updated part number solinoid and also harness. It caused low fuel pressure problems and low power . There is a bulletin on this from Mack and is on both MP7 and MP8 engines
  3. Pull the fuel supply pump . Check for play in the shaft, should be none. You can spray soapy water on shaft while shooting air into the inlet and outlet abs check for bubbles, other wise here’s what we used to do . Put fuel dye in the primary (first filter) and run the engine for about 45 seconds to a minute. Shut off engine and cap off fuel return line on the side of the block above the air compressor. Hook a air pressure regulator to the inlet of the primary fuel filter inlet and pressurize to 40-50 psi . Drop the oil pan and use a black light and look for leaks. The EUP pumps will alway
  4. I’m my notes, on a 2010 emissions truck during a regen the boost is 1.8 to 2 psi, however it doesn’t say with or without DRV valve , only the first year or two on the 2010 emissions year trucks used the DRV , they later made a kit to delete it along with a software download
  5. Look at the bulletin in the next to the last post in this thread
  6. https://static.nhtsa.gov/odi/tsbs/2013/SB-10054292-5095.pdf this Bulletin might still apply even though yours is not a MRU/leu
  7. Is the oil level over full? Fuel in the oil is a likely problem.
  8. About 10-15 years ago I spent a lot of time trying to figure this same thing out . This was the days of many trips to Radio Shack for resistors . The temperature one was somewhat easy , I had it set to around 250 degrees. The flow meter side was a totally different thing . In the engine ecm it calculates and sets a target flow that the flow meter should be reading , if the target flow was 12 pounds and the actual flow was 2 pounds you got a fault code for low EGR flow. I believe the target and actual flow has to be within 10 pounds of each other of you got the fault code . The target flow as
  9. The 4094 and 5246 codes seem to always come together. We had 3 of our truck go down in one day due to these same codes. Cold weather seems to make them happen more than the summer. Poor DEF quality, bad NOX sensors, DEF doser not spraying enough or in the worst case a bad SCR box due to coolant or oil contamination from a past EGR cooler or turbo failure. On your year model the regen temps should be around 625 T1 and 880 on the T2 . As long as the T3 is higher than T2 your probably ok. Main thing Is T2 being 880 or higher. . ( Newer common rail engines have much higher regen temps ). You will
  10. Some of our common rail engines are now over 200,000 miles and still trouble free ( all MP8) other than the fuel rail valve and pressure sensor, there are CBR bulletins on replacing them with upgrade parts and also replacing both under valve cover injector harnesses. However we still have issues with random things. Our biggest issues right now are the Mack inter wheel locks blowing apart . I wish we would order them with the inter-axle air power divider only. Also our Mack T-310 trans seem to really like to go back the dealership for hi/low synchro replacement every 18-24 months. Our last 3
  11. Last I heard they did discontinue the clutched air compressor but the on/off water pump is still an option and maybe standard now. Our 2018 and 2019 do not have the on/off water pump but our 2020.5 has it . Also our 2020.5 has the air governor in the air compressor. Back in the ASET days we had a fleet of CXN tanker trucks with the same air drier/air governor set up. Our 2020.5 trucks also have 2 oil filters instead of 3 and also no fuel return line coming off the head. They did away with the electric fuel pressure valve on the fuel rail . This was a common issue as all our common rail engine
  12. I actually had a manual for the 5, 6 and 9 speed RVI transmissions in my tool box . All it says is “ Gear Oil. MIL-L-2104D or MIL-L-2104C. SAE 40 weight “
  13. My parts buddy back at the dealership couldn’t find much info on it . RS686LST built 2-14-79. ENDT676 engine with no mention of HP rating. TRXL 107 trans . 4.17 Mack rears. Could not get any real info on front or rear suspension. However it did have the optional ABS brakes .
  14. RH Sheppard has all their manuals on the website. I use it a lot . TRW used to have their manuals online but haven’t checked it a while. First thing would be to figure out which brand then which model gear box you have .
  15. RD690P built 10-12-94 with a mechanical EM7-275 HP engine . 217” wheel base , 12,000 pound steer axle , spoke front and rear hubs, 5.02 Mack rears , Mack 5 speed trans T2050, spring rears but not camel backs .
  • Create New...