leversole Posted January 19, 2013 Share Posted January 19, 2013 Does anyone know how this is supposed to be plumbed?When I got the truck, the deep reduction did not work...one of the airlines on the front cylinder (on the side, not the back) was disconnected...dont know if there was an issue, or they did not want the drivers using it...anyway, I hooked it back up and all I get is air blowing out of the valve bolted to the side of the transmission.This is an iversion valve, which I understand is just like a pilot valve, only works in reverse. I can understand using a pilot vavle, cause then you only need a simple air toggle switch to activate, BUT, is the control cylinder spring return? I have not tracked down all of the airlines in thier current config yet but it is definetely not correct! There are two lines on the control port, and two on the supply! None on the delivery! Quote Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/ Share on other sites More sharing options...
jklj Posted January 19, 2013 Share Posted January 19, 2013 Mine has a toggle switch on the dash Quote Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158514 Share on other sites More sharing options...
leversole Posted January 20, 2013 Author Share Posted January 20, 2013 Mine has a toggle switch on the dashSo does mine? Do you have a schematic or drawing of the airlines? Quote Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158552 Share on other sites More sharing options...
jklj Posted January 20, 2013 Share Posted January 20, 2013 No but I can try and look at the truck maybe get a picture Quote Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158586 Share on other sites More sharing options...
HK Trucking Posted January 20, 2013 Share Posted January 20, 2013 It could be that the O rings on the piston in the deep reduction cylinder are shot, allowing air to leak from the "pressurized" side of the piston to the "non pressurized" side of the piston, and then the air flows back thru the line and comes out of the exhaust port on the control valve. If this is the case, then it's possible the previous owner intentionally disconected the deep reduction so that prospective buyers wouldn't hear a massive air leak if they flipped the deep reduction switch. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158596 Share on other sites More sharing options...
rsb502 Posted January 20, 2013 Share Posted January 20, 2013 Those shift cylinders need to be rebuilt from time to time, look in the engine/transmission forum there was a thread about the air system routing a couple months ago there are air system schematics posted there it was called either mack 12spd or trtxl1070 I can't remember. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158602 Share on other sites More sharing options...
farmer52 Posted January 20, 2013 Share Posted January 20, 2013 Leslie - I think you need to sell your Superdog to me and at a drastically reduced price! Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158636 Share on other sites More sharing options...
terry Posted January 20, 2013 Share Posted January 20, 2013 lo-lo is either a seperate lever or a switch on the dash,the selector on the mainstick is reverse, neutral, direct and overdrive some of the early ones were underdrive and direct. Terry Quote Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158641 Share on other sites More sharing options...
leversole Posted January 20, 2013 Author Share Posted January 20, 2013 Leslie - I think you need to sell your Superdog to me and at a drastically reduced price! Lookin' at all them wimmens must have affected your brain! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/29513-12-speed-deep-reduction-air-shift/#findComment-158652 Share on other sites More sharing options...
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