dedoKoko Posted July 13, 2016 Share Posted July 13, 2016 (edited) Question is in the topic. Lower Rpm are near 750, and it is hard to switch gear on. P.s. I shuld point that the fuel pedal is electric, not with vire. Edited July 13, 2016 by dedoKoko P.S. Quote Link to comment https://www.bigmacktrucks.com/topic/46039-lower-rpm-how-to-adjust-on-mr688s/ Share on other sites More sharing options...
TeamsterGrrrl Posted July 13, 2016 Share Posted July 13, 2016 Should be instructions in the owners manual, IIRC you adjust it with the cruise control buttons. Been awhile since I've adjusted one... Quote Link to comment https://www.bigmacktrucks.com/topic/46039-lower-rpm-how-to-adjust-on-mr688s/#findComment-339260 Share on other sites More sharing options...
dedoKoko Posted July 14, 2016 Author Share Posted July 14, 2016 From cruise control I can set the same 700 rpm. I thinck to check the fuel pump for something like bad return spring. Truck is with concrete pump mounted on, and cruise control is used from remote control also. But on minimum rpm I have the same. Quote Link to comment https://www.bigmacktrucks.com/topic/46039-lower-rpm-how-to-adjust-on-mr688s/#findComment-339333 Share on other sites More sharing options...
turckster Posted July 31, 2016 Share Posted July 31, 2016 Low idle adjustment can only be made if the option is enabled and the chassis is not equipped with an automatic transmission. If you have an auto or the feature is not enabled it has to be set using Mack software. Plus there can not be any active faults. To adjust the low idle: the vehicle must be stationary and park brake set and the throttle pedal at idle. Turn the speed control switch on/off 3 times within 2 seconds. the idle will drop to 500 rpm. Depress and hold the accelerator pedal until the desired rpm is reached. Depress and release the set switch then release the accelerator pedal. Depress and release the clutch pedal, this speed is now locked into v-mac3 as the new low idle speed 1 Quote Link to comment https://www.bigmacktrucks.com/topic/46039-lower-rpm-how-to-adjust-on-mr688s/#findComment-340951 Share on other sites More sharing options...
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