Golddog Posted February 2, 2020 Share Posted February 2, 2020 I went to move my truck the other day and it had a horrible air leak on top of transmission which is a 2110b. I determined it was the inversion valve on the back upper left of transmission , as it was blowing out the end of it where the rubber cover is. I replaced it with a brand new one from Mack only to find it did the exact same thing . Was wondering if anyone has any thoughts ? I’m thinking it could possibly be being back fed from one of the delivery ports on the valve? thanks Quote Link to comment https://www.bigmacktrucks.com/topic/60797-2110b-air-leak/ Share on other sites More sharing options...
theakerstwo Posted February 2, 2020 Share Posted February 2, 2020 Sounds like the cylinder o/rings are leaking past the piston on the range piston and exhausting back thru the range valve. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/60797-2110b-air-leak/#findComment-441803 Share on other sites More sharing options...
Golddog Posted February 2, 2020 Author Share Posted February 2, 2020 Ok thank you! I’ll replace the range valve Quote Link to comment https://www.bigmacktrucks.com/topic/60797-2110b-air-leak/#findComment-441837 Share on other sites More sharing options...
theakerstwo Posted February 2, 2020 Share Posted February 2, 2020 (edited) The seals in the range cylinder is what you need to replace. Edited February 2, 2020 by theakerstwo Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/60797-2110b-air-leak/#findComment-441839 Share on other sites More sharing options...
Golddog Posted February 3, 2020 Author Share Posted February 3, 2020 Is that different than the range valve? We just got this truck about 6 months ago so I’m very green on it especially this transmission Quote Link to comment https://www.bigmacktrucks.com/topic/60797-2110b-air-leak/#findComment-441842 Share on other sites More sharing options...
theakerstwo Posted February 3, 2020 Share Posted February 3, 2020 I would advice you to take it to the mack dealer. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/60797-2110b-air-leak/#findComment-441847 Share on other sites More sharing options...
Golddog Posted February 3, 2020 Author Share Posted February 3, 2020 Unfortunately the truck is basically undriveable the leak is so bad it really cant build air and it is stuck in high range . Can you tell me where the range cylinder is located ? Maybe I can figure it out or get some help from someone who has worked on Mack transmissions thanks Quote Link to comment https://www.bigmacktrucks.com/topic/60797-2110b-air-leak/#findComment-441848 Share on other sites More sharing options...
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