lamountain1976 Posted February 9, 2008 Share Posted February 9, 2008 Is it part of the PTO system Quote Justin LaMountain Consulting Forester and Horselogger Green Man Forestry Link to comment https://www.bigmacktrucks.com/topic/3404-what-is-this/ Share on other sites More sharing options...
Maxville Truck Posted February 10, 2008 Share Posted February 10, 2008 If I had to guess I would say you have a fuller transmission 9,13, or 18 speed and that would be the "slave Valve", when you shift your "flipper" for a range change you send an air signal to that slave valve then it shifts the rear box from low to high or vice versa. It has a mechanical interlock "pin" that allows you to preselect your range before shifting out of gear, then when you move the stick into neutral it makes the range shift. Just a guess though.... Quote Link to comment https://www.bigmacktrucks.com/topic/3404-what-is-this/#findComment-16916 Share on other sites More sharing options...
Freightrain Posted February 10, 2008 Share Posted February 10, 2008 No expert on 13 spds, but I'd say that's a pretty good guess.What do the air lines hook to? The PTO is usually down on the bottom side of the main box. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/3404-what-is-this/#findComment-16923 Share on other sites More sharing options...
theakerstwo Posted February 10, 2008 Share Posted February 10, 2008 No expert on 13 spds, but I'd say that's a pretty good guess.What do the air lines hook to? The PTO is usually down on the bottom side of the main box. I ant sure what his question is but that is the shifter air valve and i see some one is getting air supply thru the black 1/4 plactic hose at the suppy fitting to the air vave form the 62psi air regulator for the trans system and may be using the 62psi to shift their pto unit which is not fair at all. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/3404-what-is-this/#findComment-16924 Share on other sites More sharing options...
lamountain1976 Posted February 10, 2008 Author Share Posted February 10, 2008 If I had to guess I would say you have a fuller transmission 9,13, or 18 speed and that would be the "slave Valve", when you shift your "flipper" for a range change you send an air signal to that slave valve then it shifts the rear box from low to high or vice versa. It has a mechanical interlock "pin" that allows you to preselect your range before shifting out of gear, then when you move the stick into neutral it makes the range shift. Just a guess though....It is a Fuller 9 speed, and I traced the air lines and they do run back to the switch for the hi/lo on the shifter. Wondering why that little green wire was in there with them and is now cut back? Quote Justin LaMountain Consulting Forester and Horselogger Green Man Forestry Link to comment https://www.bigmacktrucks.com/topic/3404-what-is-this/#findComment-16940 Share on other sites More sharing options...
fjh Posted February 12, 2008 Share Posted February 12, 2008 It is a Fuller 9 speed, and I traced the air lines and they do run back to the switch for the hi/lo on the shifter. Wondering why that little green wire was in there with them and is now cut back? it is likly the exhast for the range button Quote Link to comment https://www.bigmacktrucks.com/topic/3404-what-is-this/#findComment-16966 Share on other sites More sharing options...
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