gearhead204 Posted November 10, 2013 Share Posted November 10, 2013 chase the compressor discharge line to the wet tank. if the truck has a check valve it should be on the end of the discharge line. some trucks don't have them.I cant think of any reason you couldn't add one though. any one else have any thoughts on this Quote Link to comment https://www.bigmacktrucks.com/topic/32331-tractor-parking-valve/page/2/#findComment-215904 Share on other sites More sharing options...
farmer52 Posted November 10, 2013 Author Share Posted November 10, 2013 Hell.....I'll look for air leaks for a beer.....lolCome on down! chase the compressor discharge line to the wet tank. if the truck has a check valve it should be on the end of the discharge line. some trucks don't have them.I cant think of any reason you couldn't add one though. any one else have any thoughts on thisThanks! I looked in the parts book and do not see a check valve between the compressor and the tank. I will look at the line the next time I see the MH. There is a check valve in the line at the "secondary" (left side) tank.As I type this reply, I am thinking there is also a small leak "down stream" of the secondary tank or the check valve is leaking. Otherwise it would hold air pressure. Does this make sense? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/32331-tractor-parking-valve/page/2/#findComment-215931 Share on other sites More sharing options...
gearhead204 Posted November 11, 2013 Share Posted November 11, 2013 I'm trying to pick up what your putting down! hard 2 do without schmatics just working from lack of memory. my best advice is when empty air tank shows on gauge open drain valve to find empty tank. then charge empty tank with shop air get some beer and call martell Quote Link to comment https://www.bigmacktrucks.com/topic/32331-tractor-parking-valve/page/2/#findComment-216106 Share on other sites More sharing options...
Mike Posted November 11, 2013 Share Posted November 11, 2013 Hell.....I'll look for air leaks for a beer.....lolThat's right, I welcome air leaks most everyday. Makes me feel better, but will take a lot more than one beer.mike Quote Link to comment https://www.bigmacktrucks.com/topic/32331-tractor-parking-valve/page/2/#findComment-216109 Share on other sites More sharing options...
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