swdrag1 Posted July 8, 2018 Share Posted July 8, 2018 Need Help!! I have a 1982 Mack r model with a 12 speed maxitorque transmission it started leaking air out the exhaust line on the shifter when I put it in high range, I thought it was the shifter knob so I bought a new one and that didn't cure the problem. I was able to drive in low range with no problems but now it is starting to leak out the exhaust line when I put it in low. Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/ Share on other sites More sharing options...
mrsmackpaul Posted July 8, 2018 Share Posted July 8, 2018 Pressure regulator sounds like its not working on the transmission Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-402141 Share on other sites More sharing options...
swdrag1 Posted July 8, 2018 Author Share Posted July 8, 2018 Thanks .Any idea where the regulator is located and is this something I can repair without taking to the shop Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-402146 Share on other sites More sharing options...
fjh Posted July 8, 2018 Share Posted July 8, 2018 (edited) I would start with re oringing the split cyl you can do this From the back side of the trans IN (THE TRUCK) by removing the 4 bolt cap (3/8 bolts) with the round cylinder on it! sliding everything off in order pay attention to how to take it off as there are several pieces inside! Just my observation the regulators rarely screw up ! Edited July 8, 2018 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-402151 Share on other sites More sharing options...
swdrag1 Posted July 8, 2018 Author Share Posted July 8, 2018 do they sell an o ring kit or just need to match them up Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-402161 Share on other sites More sharing options...
mrsmackpaul Posted July 8, 2018 Share Posted July 8, 2018 (edited) 8 hours ago, swdrag1 said: Thanks .Any idea where the regulator is located and is this something I can repair without taking to the shop On the top of the transmission RHS on the ones I have worked on Some have two regulators some have two They should ne 55 -60 psi Paul Edited July 8, 2018 by mrsmackpaul Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-402163 Share on other sites More sharing options...
mrsmackpaul Posted July 8, 2018 Share Posted July 8, 2018 If you find the pressure is to high I would guess it has popped the o rings and seals in the gear knob so it will need to be disassembled and the o rings put back in their grooves Paul Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-402164 Share on other sites More sharing options...
fjh Posted July 9, 2018 Share Posted July 9, 2018 (edited) TheY run @70 psi or so i think you have to by the orings separately! I believe PAI offers a kit Edited July 9, 2018 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-402171 Share on other sites More sharing options...
frantzevan Posted October 11, 2022 Share Posted October 11, 2022 Did you ever find a solution to this problem? I am having the exact same problem even after rebuilding shifter and replacing pressure regulator. Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511495 Share on other sites More sharing options...
mechohaulic Posted October 11, 2022 Share Posted October 11, 2022 once again we see the same situation; no matter what the time of post ; answers are given to a problem but replies are never returned for others to learn the cause. I would go with the post regarding the o-rings in range valve 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511509 Share on other sites More sharing options...
Onyx610 Posted October 11, 2022 Share Posted October 11, 2022 (edited) My only issue with this forum. Edited October 11, 2022 by Onyx610 Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511510 Share on other sites More sharing options...
tjc transport Posted October 11, 2022 Share Posted October 11, 2022 not just this forum. in general it is a problem with all forums. one post wonders come asking questions, get help and never come back to say if it fixed it or not. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511532 Share on other sites More sharing options...
MACKS Posted October 11, 2022 Share Posted October 11, 2022 fjh got it right,it’s the shift cyl that causes that problem,there is a kit for this,that’s the way to go,to hard to match them up,I tried,I may have the kit number,will check tonight,very easy job.. Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511535 Share on other sites More sharing options...
frantzevan Posted October 11, 2022 Share Posted October 11, 2022 Please let me know if you can allocate the rebuild kit #. I ordered a standard o ring kit plastic washers and a snap ring kit to ensure I have a large selection on hand. But would prefer to know I have all I need with a kit can piece it together. Thanks in advance! Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511537 Share on other sites More sharing options...
doubleclutchinweasel Posted October 11, 2022 Share Posted October 11, 2022 3 hours ago, tjc transport said: not just this forum. in general it is a problem with all forums. one post wonders come asking questions, get help and never come back to say if it fixed it or not. Worked kinda like those "one-way" radios we used to have in the vehicle with us. Give 'em a smokey report, and they never said "thanks" or returned the favor. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511538 Share on other sites More sharing options...
MACKS Posted October 11, 2022 Share Posted October 11, 2022 6 hours ago, frantzevan said: Please let me know if you can allocate the rebuild kit #. I ordered a standard o ring kit plastic washers and a snap ring kit to ensure I have a large selection on hand. But would prefer to know I have all I need with a kit can piece it together. Thanks in advance! Here it is this is a pai kit,not sure where I ordered it just google it you’ll find it,this not only fixed the air leaking from the exhaust port but I also had a problem shifting into reverse when it got cold out like neat freezing,this also fixed that problem..let us know how it works out,like I said it’s any easy fix but use the kit,the o rings are a little different then you’ll find elsewhere.. Quote Link to comment https://www.bigmacktrucks.com/topic/53760-need-help-12-speed-maxitorque-air-leak/#findComment-511562 Share on other sites More sharing options...
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