4400 White Posted December 11, 2013 Share Posted December 11, 2013 Hello, I am trying to find some information on a 1980 R612 ST with a E6-315 engine. What do the letter designations mean? Quote Link to comment https://www.bigmacktrucks.com/topic/33838-letter-designations-on-a-r612-st/ Share on other sites More sharing options...
Maddog13407 Posted December 11, 2013 Share Posted December 11, 2013 600 series ,12 means it has a 300+ engine in it or an ETAZ673. ST usually means'' tandem tractor'' or ''short tractor'' Quote Link to comment https://www.bigmacktrucks.com/topic/33838-letter-designations-on-a-r612-st/#findComment-220923 Share on other sites More sharing options...
Superdog Posted December 11, 2013 Share Posted December 11, 2013 ST six wheel tractor 1 Quote Link to comment https://www.bigmacktrucks.com/topic/33838-letter-designations-on-a-r612-st/#findComment-220927 Share on other sites More sharing options...
4400 White Posted December 12, 2013 Author Share Posted December 12, 2013 Thanks Maddog and Superdog. Is there a list anywhere of the different models of trucks and engines and their designation codes? Quote Link to comment https://www.bigmacktrucks.com/topic/33838-letter-designations-on-a-r612-st/#findComment-221026 Share on other sites More sharing options...
j hancock Posted December 12, 2013 Share Posted December 12, 2013 http://www.bigmacktrucks.com/index.php?/tutorials/article/78-mack-engine-codes/http://www.bigmacktrucks.com/index.php?/tutorials/article/57-engine-model-designations/This may help.Some models of truck will be B, R, U, DM, RW, RL, RS for example. The first number will be the weight class 4, 6, 7, 8. The next two numbers are the engine code.Mack has used various suffix letters. Some examples:T for single axle tractorST for six wheel tractorP is a single axle straight chassisS for straight tandem chassisX severe dutySX tandem severe duty Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/33838-letter-designations-on-a-r612-st/#findComment-221031 Share on other sites More sharing options...
4400 White Posted December 13, 2013 Author Share Posted December 13, 2013 Thanks Pedigreed Bulldog Quote Link to comment https://www.bigmacktrucks.com/topic/33838-letter-designations-on-a-r612-st/#findComment-221174 Share on other sites More sharing options...
jc trucking Posted December 16, 2013 Share Posted December 16, 2013 I was looking around and is intresting info. I have an R685 sx 1974 have some modification in it with an intercooler runs better every day Quote Link to comment https://www.bigmacktrucks.com/topic/33838-letter-designations-on-a-r612-st/#findComment-221634 Share on other sites More sharing options...
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