Air Pressure Problems

[psd350]

Hello I have an M35a2 and have recently begun have problems with compressor cycling on and off constantly I hear the switch under the cab going on and off any help would be great. Thanks

Brian,

 

[Blendmaster2002]

First thing to do is look for air leaks to find the problem then look in the TM’s for the problem or report back on this thread if you need more help.

Best to look for leaks with the air pressure up and the truck off should be able to hear a large leak, plus take a squirt bottle with a soapy water solution around the air system of the truck a small to medium leak should bubble, a big leak will blast it away.

Check and make sure both the glad hand valves at the rear of the truck are off and not that just the covers are on!

Also make sure your air tank drains are fully closed from the last time you drove the truck and drained the tanks.

Don’t forget to look for leaks under the dash, check the air pressure warning buzzer sending unit, See this thread: http://www.steelsoldiers.com/showth...d-help-from-the-old-soldiers&referrerid=19939

 

[psd350]

Thanks I will check I really appreciate the info

 

[m-35tom]

under the cab??? there is nothing under the cab. the air pressure control is on the firewall and the pressure relief is behind the rear of the cab. how high does the pressure go before it shuts off? is your relief jusy dumping air?

 

[steelandcanvas]

Not mentioned yet, but be sure and check the plumbing underneath the hood, especially around the compressor itself and the governor on the firewall.

 

[psd350]

Thank You guys I have not been able to check yet had the flu but I will go through everything as soon as I can thank you for all the help!!

 

[Ferroequinologist]

My air regulator on the firewall would click click click click and sometimes go away and sometimes just start going. I took the air lines off and put some air tool oil in it, and hooked the lines back up. Never had a problem with it again.

If the safety under the cab is opening and closing, the regulator is stuck and your compressor is just running all the time.

 

[Scarecrow1]

I didn't really have a noticeable problem but when I shut off my 923 and came back to it after a couple of hours it still had to build up pressure again . I listened and couldn't hear a thing so I started looking and found the rear glad hand was connected to the cover but the valve was half open. So I would double check it first .......

 

[ryan77]

Check the rubber hose for the air gauge and front diff lock! They usually are dry rotted!