wacatak Posted May 2, 2014 Share Posted May 2, 2014 im looking for some information I have a 12spd maxitorque and in the selector switch on the shifter knob it keeps blowing the top o-ring out. Any ideas what would cause this problem? I already replaced the o-rings. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/ Share on other sites More sharing options...
gearhead204 Posted May 2, 2014 Share Posted May 2, 2014 did you install a mack repair kit in the shifter or just o rings? Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244058 Share on other sites More sharing options...
mrsmackpaul Posted May 2, 2014 Share Posted May 2, 2014 check the air pressure regulator on the box I think it is meant to be around 45 -55 psi Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244087 Share on other sites More sharing options...
wacatak Posted May 3, 2014 Author Share Posted May 3, 2014 I just replaced the o-rings mack said that they just sell the whole selector switch. When it spits it out in 5 min I can put it back in and run awhile then it will do it again at some point just an intermitent problem. Wheres the pressure regulator your talking about? thanks Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244147 Share on other sites More sharing options...
j hancock Posted May 3, 2014 Share Posted May 3, 2014 The reg. is usually located on the trans.I believe the shifter knob gets full air but the air pres. is reduced between the knob and before going into the shifter housing on the top of the trans.Sounds like your knob is worn out if the o rings or going in and out that easily. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244149 Share on other sites More sharing options...
BAD DOG Posted May 3, 2014 Share Posted May 3, 2014 Sounds like too much air pressure, I'd check the regulator. Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244151 Share on other sites More sharing options...
gearhead204 Posted May 3, 2014 Share Posted May 3, 2014 I think you are getting a Volvo parts man, there is a minor kit- o rings, poppet, detents, grease. then a major kit that has the drum w/lever. I haven't got the major in a while but I just got the minor 8 mos. ago Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244163 Share on other sites More sharing options...
MACKS Posted May 3, 2014 Share Posted May 3, 2014 The regulator should be on the drivers side of tranny toward the back and top. Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244219 Share on other sites More sharing options...
mrsmackpaul Posted May 4, 2014 Share Posted May 4, 2014 Gudday all the pressure regulator Im talking about is on the top of the box some 12 speeds have 1 regulator some have 2 depends on I dont know someone much smarter than me can proberly tell you this one is set at 65 psi and the regulator is before the gear stick selector if it is set to high you will hear air leaking out all the time even with good seals good luck and keep us informed seeya Paul Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244277 Share on other sites More sharing options...
MACKTRUCKS4 Posted May 4, 2014 Share Posted May 4, 2014 When I was having problems with my 12 speed, an old time mechanic told me to bypass the regulator and the trans will shift like a new one and he was right. It's bin disconnected for two years now with no problems. I think the problem is in the shifter handle. Did you get the O-rings from Mack? Not sure if they're a special size. 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/35592-12spd-maxitorque/#findComment-244322 Share on other sites More sharing options...
leversole Posted May 8, 2014 Share Posted May 8, 2014 I think you are getting a Volvo parts man, there is a minor kit- o rings, poppet, detents, grease. then a major kit that has the drum w/lever. I haven't got the major in a while but I just got the minor 8 mos. agoI put the minor kit in mine last year so I know they sell it.. Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-244683 Share on other sites More sharing options...
wacatak Posted May 17, 2014 Author Share Posted May 17, 2014 mack said that i had to buy the whole shifter so i located 2 new orings but it didnt correct the problem. So the shifter may be the next step. All the info is appreciated. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-245786 Share on other sites More sharing options...
gearhead204 Posted May 17, 2014 Share Posted May 17, 2014 try a different dealer or ipd Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-245788 Share on other sites More sharing options...
gearhead204 Posted May 17, 2014 Share Posted May 17, 2014 oops I meet pai not ipd Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-245790 Share on other sites More sharing options...
majors loggin Posted August 21, 2020 Share Posted August 21, 2020 anyone have any opinions on why my maxitorque transmission would be pressuring the case and blew out the front seal and oil coming out of the new selector valve on the transmission Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-459205 Share on other sites More sharing options...
mrsmackpaul Posted August 21, 2020 Share Posted August 21, 2020 Vent on transmission is blocked Oil out the selector valve would be more of air tank full of crap and oil than a gear box issue as the two arent connected Paul Quote Link to comment https://www.bigmacktrucks.com/topic/35592-12spd-maxitorque/#findComment-459206 Share on other sites More sharing options...
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