408lq9 Posted May 18, 2013 Share Posted May 18, 2013 I have a 98 mack ch613. The air pressure builds sometime, and other times you can raise the motor and nothing happens. I installed a governor yesterday and it build pressure. Once I hit the brakes several times, the pressure would not raise again. If I take the small line off the compressor that hooks to the governor, it builds the air pressure. Could someone please help ASAP. Trucks been down since yesterday and it missed another day of work............also, the governor mounts to the frame on this unit. Quote Link to comment https://www.bigmacktrucks.com/topic/31223-cant-get-it-up/ Share on other sites More sharing options...
felicello122 Posted May 18, 2013 Share Posted May 18, 2013 Check the unloaded valves in the top of the air compressor head, they stick and get dirty they are located under that small odd shaped plate with 5 bolts, remove the plate and they will pop up if they are working right, bendix sells a unloader kit with new gasket and valves. Just tell the parts guy the model of the compressor, Mack sells them if you work off the vin number, higher price than a bendix outlet. Quote Link to comment https://www.bigmacktrucks.com/topic/31223-cant-get-it-up/#findComment-183970 Share on other sites More sharing options...
408lq9 Posted May 18, 2013 Author Share Posted May 18, 2013 Check the unloaded valves in the top of the air compressor head, they stick and get dirty they are located under that small odd shaped plate with 5 bolts, remove the plate and they will pop up if they are working right, bendix sells a unloader kit with new gasket and valves. Just tell the parts guy the model of the compressor, Mack sells them if you work off the vin number, higher price than a bendix outlet.can they be cleaned with some type of solvent just to make sure before spending the money troubleshooting? Quote Link to comment https://www.bigmacktrucks.com/topic/31223-cant-get-it-up/#findComment-183975 Share on other sites More sharing options...
408lq9 Posted May 19, 2013 Author Share Posted May 19, 2013 Thanks, That was the root of the problem. Quote Link to comment https://www.bigmacktrucks.com/topic/31223-cant-get-it-up/#findComment-184230 Share on other sites More sharing options...
rsb502 Posted May 20, 2013 Share Posted May 20, 2013 A lot of people end up buying compressors when a $40 unloader kit and a $20 governor is normally all that's needed. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/31223-cant-get-it-up/#findComment-184315 Share on other sites More sharing options...
felicello122 Posted May 21, 2013 Share Posted May 21, 2013 Your welcome glad to help out. Quote Link to comment https://www.bigmacktrucks.com/topic/31223-cant-get-it-up/#findComment-184502 Share on other sites More sharing options...
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