mcratchet1

No i did not

Just had a question I have 07 mr688s cab over lately I’ll get no response to pedal for a split second while driving it always happens around 1300-1600 rpm’s it was maybe once a day now it’s most of the time. I check the batteries, connections, grounds, etc. awhile back I had no response to pedal at all so change the pedal sensor. It does not log any codes. I have checked EUP connections also. Any advice would be greatly appreciated

Ok thanks for that input I know I have a few small leaks because next morning I only have about 40 lbs in tanks but just recently my purge valve is popping off every 20-30 seconds

Hey I have a 2007 mr688s the air compressor has started leaking oil getting a little out of purge valve. Should I change now or can it wait till the end of year ? Thanks

Ok great thanks, just wanted to make sure!

I have a 2007 Mack mr688 the top carrier is leaking into bottom one over filling it. Is there a seal inside that separates them? Thanks!

Ok thanks guys I’ll try the oil and left hand bit and keep an eye on them! It’s a concrete boom pump on its back lol

Hey guys just was wanted a professional opinion I have 2007 Mack mr688s mp7 400hp the #6 exhaust mainifold broke bolt the top one, is this the cause of another issue or just old rusted bolt? Should I try to get the one bolt replaced or wait to see if another one breaks? Thanks in advance!

No oil at all ever comes out of tanks at night I will check lines for build up thanks

I have 07 mr688s some morning it takes about 10 mins to build air most days only about 2 mins. I replaced governor check for air leaks and serviced dryer. Replaced filter and purge valve. I have had this truck 2 year I don’t when air compressor was changed. Is this a sign of my air compressor starting to fail?

No pto in front yes I’ll try that I’ll take the belts off and see thanks

I have 2006 Mack mr 688s with Horton clutch fan about two years old. It seems like every other day it will start humming almost whistle for a little bit then go away. Only while not engaged. All pulleys and belts are about six months old. Is this a early sign of clutch failure? Any advice would be really appreciated

Ok thanks I check the hoses and tubing I don’t see any holes or leaks. It does not appear to be affecting anything just annoying. It seems to stay on only in the afternoon when it get hot

I have a 2007 mr688s with a 2-8 blink code which is combustion air temperature? Is it the boost pressure sensor that would cause this ? Thanks in advance

Just wondering if 75w90 is the right type of gear oil to be using in these diffs I work in northwest Florida 2007 Mack mr688s