Keffer inc Posted June 1, 2013 Share Posted June 1, 2013 Hello, My work truck lost reverse at the end of the day, air is leaking from the top of the transmission, under the air valve at the rear of the trans. I cant tell for sure, but it feels like a threaded pipe plug has broke and is leaking the air. I still have lo/hi range for driving but when I try reverse, It starts to lightly grind and hissing air. I put my finger between the air body and the housing and I pretty sure its coming out from the top of the trans. feels like half the plug broke off. Can anyone confirm if that is a plug or something more serious. Our other tractor is in the shop for king pins as well so we're down both trucks now. Need help asap so we can keep going Monday. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/31401-1987-superliner-12-spd-no-reverse-help-please/ Share on other sites More sharing options...
BAD DOG Posted June 2, 2013 Share Posted June 2, 2013 I'd say the shift cylinders on top need an o- ring kit put in . Not an expensive fix just not handy to get at . Quote Link to comment https://www.bigmacktrucks.com/topic/31401-1987-superliner-12-spd-no-reverse-help-please/#findComment-186475 Share on other sites More sharing options...
Keffer inc Posted June 2, 2013 Author Share Posted June 2, 2013 (edited) I found a picture of what I think is broke Edited June 2, 2013 by Keffer inc Quote Link to comment https://www.bigmacktrucks.com/topic/31401-1987-superliner-12-spd-no-reverse-help-please/#findComment-186534 Share on other sites More sharing options...
Keffer inc Posted June 2, 2013 Author Share Posted June 2, 2013 It felt like something was chipped of broke off, rough feeling like half a plug was missing Quote Link to comment https://www.bigmacktrucks.com/topic/31401-1987-superliner-12-spd-no-reverse-help-please/#findComment-186535 Share on other sites More sharing options...
theakerstwo Posted June 2, 2013 Share Posted June 2, 2013 I think that is a vent that is leaking. If so that means air is leaking inside from the shaft cyl. So as already been told pull your sift cover and replace the o/rings.Simple on a Superliner or R700.One thing that makes it easy is drop the drive line and lift the rear of the cab some.I have did them by raisingthe cab about 4 inches. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/31401-1987-superliner-12-spd-no-reverse-help-please/#findComment-186543 Share on other sites More sharing options...
Keffer inc Posted June 3, 2013 Author Share Posted June 3, 2013 Looked at it again this morning with the master tech, and air is leaking from the bottom of the air valve. Hopefully still o rings? Quote Link to comment https://www.bigmacktrucks.com/topic/31401-1987-superliner-12-spd-no-reverse-help-please/#findComment-186661 Share on other sites More sharing options...
MACKTRUCKS4 Posted June 6, 2013 Share Posted June 6, 2013 12 sp. in a superliner is not hard to pull the top cover because the cab sits higher. There is a vent in the one cylinder, air could leak out if the O-rings are bad. Not a hard job, just make sure you mark all the lines for easy installation. 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/31401-1987-superliner-12-spd-no-reverse-help-please/#findComment-187233 Share on other sites More sharing options...
Keffer inc Posted June 6, 2013 Author Share Posted June 6, 2013 Yup, thats what happened. Thanks for the help everyone. Quote Link to comment https://www.bigmacktrucks.com/topic/31401-1987-superliner-12-spd-no-reverse-help-please/#findComment-187252 Share on other sites More sharing options...
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