Medium and Heavy Trucks
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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.
If you have not had the fault codes checked to see what codes are set this should be done first.If any codes are set the codes will need diagnosed to locate and correct this issue here.IN some cases there may be a code set that will help pinpoint this leak/fault here.
Make sure no air lines or components are found leaking as well.In some cases I have had to use a smoke machine to inject smoke into the air system to locate any hard to see leaks and then repair those leaks from there.This may need further checking/tests to locate and repair any leaks but I would have the fault codes checked first.
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Hi My name is***** will be glad to help with your air system. First if you have an air dryer on this truck check to see if it is plugged or leaking or if there are leaks in the supply line. Try bypassing the air dryer with a union to see if it will build air. If not and the governor is new and no air system leaks you likely have sticking unloader valve in the head of the compressor. They sell kits for them but it is not always successful in installing an unloader kit and compressor replacement becomes necessary. Let me know if you need more help.