Nsfr1206 Posted August 2, 2018 Share Posted August 2, 2018 (edited) My 2002 MR688 concrete pump is showing code 3-4. I’ve had the Mack dealer replace the sensor. It didn’t fix it so replaced the balancer pulley. Still no joy. It flashes on and off and typically stays on at full throttle. At idle it’s off. When my foot isn’t in to it too hard it’s on sometimes and off sometimes. Any ideas? Edited August 2, 2018 by Nsfr1206 Misspelling Quote Link to comment https://www.bigmacktrucks.com/topic/53963-code-3-4-help/ Share on other sites More sharing options...
Mackpro Posted August 2, 2018 Share Posted August 2, 2018 There is a service bulletin on the 3-4 code SB221037. I believe it's been posted here before. Quote Link to comment https://www.bigmacktrucks.com/topic/53963-code-3-4-help/#findComment-403511 Share on other sites More sharing options...
Mackpro Posted August 2, 2018 Share Posted August 2, 2018 Quote Link to comment https://www.bigmacktrucks.com/topic/53963-code-3-4-help/#findComment-403512 Share on other sites More sharing options...
Nsfr1206 Posted August 3, 2018 Author Share Posted August 3, 2018 Thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/53963-code-3-4-help/#findComment-403531 Share on other sites More sharing options...
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