codog Posted January 24, 2014 Share Posted January 24, 2014 What's the difference between Mack RD686,RD688,RD690,......??Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/34371-mack-model-difference/ Share on other sites More sharing options...
Superdog Posted January 24, 2014 Share Posted January 24, 2014 It's the engine that;s the difference. Depending on the year made, a RD686 could have a ENDT676 Maxidyne '73 to '80 or a E6-285 or E6-300 . The RD688 would have been powered by the first tip turbine 350's then the E6-350,then the E6-300 Econodyne version. The RD690 started out with the EM6 275 and EM6 300 Maxidynes,but I;m pretty sure after the E7 engines came out,they were all called RD690;s no matter what hp of the E7 engine was in it. Quote Link to comment https://www.bigmacktrucks.com/topic/34371-mack-model-difference/#findComment-228461 Share on other sites More sharing options...
codog Posted January 25, 2014 Author Share Posted January 25, 2014 Ok Thanks, I'm looking to buy a RD Tri axle dump truck. I seen those models on truck paper , just didn't know what the difference was Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/34371-mack-model-difference/#findComment-228467 Share on other sites More sharing options...
j_martell Posted January 25, 2014 Share Posted January 25, 2014 It's the engine that;s the difference. Depending on the year made, a RD686 could have a ENDT676 Maxidyne '73 to '80 or a E6-285 or E6-300 . The RD688 would have been powered by the first tip turbine 350's then the E6-350,then the E6-300 Econodyne version. The RD690 started out with the EM6 275 and EM6 300 Maxidynes,but I;m pretty sure after the E7 engines came out,they were all called RD690;s no matter what hp of the E7 engine was in it.Maybe I missed something (or misunderstand your post), but would our 88 rd 688s e6-350 econodyne be a repower then?Tia for the response.... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/34371-mack-model-difference/#findComment-228470 Share on other sites More sharing options...
Superdog Posted January 25, 2014 Share Posted January 25, 2014 No that would be right,the RD688 had both versions of the 350. Things got kinda run together in my first post, sometimes my fingers don't translate what I wanna say the best. Quote Link to comment https://www.bigmacktrucks.com/topic/34371-mack-model-difference/#findComment-228513 Share on other sites More sharing options...
j_martell Posted January 25, 2014 Share Posted January 25, 2014 No that would be right,the RD688 had both versions of the 350. Things got kinda run together in my first post, sometimes my fingers don't translate what I wanna say the best.You and I suffer the same problem lol 1 Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/34371-mack-model-difference/#findComment-228615 Share on other sites More sharing options...
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