Terry Hale Posted December 25, 2014 Share Posted December 25, 2014 I have several mack tractors that have this problem when acceling wont go highter than 1400 Rpm Quote Link to comment Share on other sites More sharing options...
rsb502 Posted December 25, 2014 Share Posted December 25, 2014 What year, engine, etc. Are you sure they aren't in derate or PTO mode. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
Dirtymilkman Posted December 25, 2014 Share Posted December 25, 2014 Or they're set up for progressive shifting Quote Link to comment Share on other sites More sharing options...
j_martell Posted December 25, 2014 Share Posted December 25, 2014 if you use the electronic hand throttle on some of the newer ones, touching the brakes or clutch deactivates the higher idle, but not turning off the cruise switch can limit engine rpm and engine brake until the switch is off..... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
Terry Hale Posted December 26, 2014 Author Share Posted December 26, 2014 year model vary from 08 to 12 to answer one question and will lok at the other suggestions thanks for the input Quote Link to comment Share on other sites More sharing options...
rsb502 Posted December 27, 2014 Share Posted December 27, 2014 If its several 08-12 models and they don't have a fault light on the dash they're set that way in the ecm. Like stated above you can set them for progressive shifting and make a driver drive the way you want. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
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