leversole Posted December 24, 2012 Share Posted December 24, 2012 Lots of good info here...does anyone have a diagram of the deep reduction part of the system? When I flip my dash switch I just get air out of the bottom of this valve and it does not shift...Only one airline to the front cylinder, but no "loose" airlines flopping around, assume it takes two, or is it "spring return"?Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/13871-calling-all-mack-12-speed-experts/page/2/#findComment-153038 Share on other sites More sharing options...
rick harper Posted December 26, 2012 Share Posted December 26, 2012 The 12 speed also had a separate air filter. Part number was 57MD3131. Screw on canister. Quote Link to comment https://www.bigmacktrucks.com/topic/13871-calling-all-mack-12-speed-experts/page/2/#findComment-153360 Share on other sites More sharing options...
BGarofalo Posted January 23, 2013 Share Posted January 23, 2013 Im going to be replacing the 5 speed in my single axle r-model with a t1070b. I picked up the trans as a take out and have no lines at all. Now It did come with the plate that has an: air filter,1 regulator set at 70 psi, and 2 of what looks like inversion valves. Now the diagram that is above is the same one I have. My question is how is the plumbing set up with this? The diagram dosent seem to match the valves that are on the plate with the filter. Also what size air line should I be using? 1/8 or 1/4? And from the diagram it seems as the reverse circuit is not at reduced air line pressure like the Dir/L circuit. Quote Link to comment https://www.bigmacktrucks.com/topic/13871-calling-all-mack-12-speed-experts/page/2/#findComment-159338 Share on other sites More sharing options...
leversole Posted January 24, 2013 Share Posted January 24, 2013 One of the inversion valves (the lower one on mine) is for the front compound deep reduction... Quote Link to comment https://www.bigmacktrucks.com/topic/13871-calling-all-mack-12-speed-experts/page/2/#findComment-159398 Share on other sites More sharing options...
MACKTRUCKS4 Posted January 24, 2013 Share Posted January 24, 2013 Lots of good info here...does anyone have a diagram of the deep reduction part of the system? When I flip my dash switch I just get air out of the bottom of this valve and it does not shift...Only one airline to the front cylinder, but no "loose" airlines flopping around, assume it takes two, or is it "spring return"?ThanksIMG_7735a.JPGIMG_7744.JPGThe main stick must be in first gear for the deep reduction to shift, and once it is in deep, you should not be able to shift the main stick out of first. It will move up, but should not move to the right as if you were going for second, Quote Live every day like it's your last, because one of these days, it will be. Link to comment https://www.bigmacktrucks.com/topic/13871-calling-all-mack-12-speed-experts/page/2/#findComment-159401 Share on other sites More sharing options...
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