Macklowentry Posted April 9, 2009 Share Posted April 9, 2009 I work for WM and drive a 2001 Mack MR, and on the dash is a red and silver button that says override. What does this button override? Quote Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/ Share on other sites More sharing options...
jzack Posted April 10, 2009 Share Posted April 10, 2009 I work for WM and drive a 2001 Mack MR, and on the dash is a red and silver button that says override. What does this button override?Probably overrides the auto shutdown. My CH has one anyway. After 5 min of idle time a buzzer sounds warning you the engine will shutdown unless the override button is pressed. Quote Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/#findComment-33505 Share on other sites More sharing options...
Rob Posted April 10, 2009 Share Posted April 10, 2009 Probably overrides the auto shutdown. My CH has one anyway. After 5 min of idle time a buzzer sounds warning you the engine will shutdown unless the override button is pressed.I think Yellow Freight has the same type setup on their trucks as aftermarket add on. I know the button is red, and says "override" also.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/#findComment-33507 Share on other sites More sharing options...
other dog Posted April 10, 2009 Share Posted April 10, 2009 I think Yellow Freight has the same type setup on their trucks as aftermarket add on. I know the button is red, and says "override" also.RobI've seen some Peterbilts that had an override toggle switch that you had to hold down when starting the engine, or it wouldn't start. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/#findComment-33510 Share on other sites More sharing options...
Gambi80 Posted April 10, 2009 Share Posted April 10, 2009 Is the length of time adjustable or is it 5 minutes on all trucks? My CH has the override button, but I've let it idle for more than 5 minutes on a few occassions and it hasn't shut down. Not a big deal as I bump the cruise to 1,000 RPM most of the time anyway. Must be disabled...? Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/#findComment-33522 Share on other sites More sharing options...
jzack Posted April 10, 2009 Share Posted April 10, 2009 Is the length of time adjustable or is it 5 minutes on all trucks? My CH has the override button, but I've let it idle for more than 5 minutes on a few occassions and it hasn't shut down. Not a big deal as I bump the cruise to 1,000 RPM most of the time anyway. Must be disabled...?Maybe its 10 minutes....not really sure because I always bump my idle up too. I wouldn't think its adjustable because I heard its a safety issue to prevent colder than normal cylinder temps that could allow unburned fuel passby the rings and into the crankcase.....not positive though. Quote Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/#findComment-33542 Share on other sites More sharing options...
fjh Posted April 10, 2009 Share Posted April 10, 2009 Maybe its 10 minutes....not really sure because I always bump my idle up too. I wouldn't think its adjustable because I heard its a safety issue to prevent colder than normal cylinder temps that could allow unburned fuel passby the rings and into the crankcase.....not positive though.I beleive this button enbles you to override a low oil or high temp auto shut down to get the truck off the road. Quote Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/#findComment-33555 Share on other sites More sharing options...
Maxville Truck Posted April 11, 2009 Share Posted April 11, 2009 I beleive this button enbles you to override a low oil or high temp auto shut down to get the truck off the road.Your right it is a low oil, high temp or lack of water shut down system, most are disabled when get most of my MR's in, the MR you'e driving is it an electronic motor? Quote Link to comment https://www.bigmacktrucks.com/topic/8971-what-is-the-override-button-for/#findComment-33567 Share on other sites More sharing options...
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