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mcratchet1

help with purge valve (spitter)

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Ok so i have a 2006 mack mr688s vin# 032711 

always would pop air out of purge valve every 10-15 seconds all day 

Air compressor went out so installed reman from mack as well as a new air dryer, governor, and new air line from compressor to dryer still popping off every 10-15 seconds could someone help a brother out on this? i have never had one do this thanks in advance!!!

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can't really add much to your post mach technician. most times i have come across that it was normally a leak in the sense line from the governor to the wet tank or a leaking fitting on the wet tank. 

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I had an AD-4 on one of my Mid-Liners and the air dryer purged five times every cycle. Strangest thing in rapid succession, psss, psss, psss, psss, psss, and then stop. Turned out to be a hairline cracked brass compression fitting on the sense line at the dryer port. Finally found it with soapy water and variable pressure shop air plumbed into the drain port of the wet tank to test the complete system.  

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so getting back to this, i have checked ever where for a leak cant find one truck holds air pressure over night also

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Is it holding air in the wet tank or by the dash gauges?

I I remember correctly there is a check valve on the inlet to both the primary and secondary tanks on the feed lines from the wet tank

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yes from dash, ill take a look at check valves should i put a gauge on the wet tank itself to see if its losing air somehow? could it backfeed thru a valve?

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