I operate a 2006 putz 52meter on a mack. the problem i am having is when my pump is in pto i sometimes lose the throtle. i will be pumping along and all of a sudden the truck starts idling down or when i am washing out or even setting up. then the malfuction light comes on. now every thing else works. boom, outriggers, pump, just no rpms. so i then put something on the gas pedal to get me going again until i can throtle up on my box. putz says if the malfuction light comes on then it is a mack thing and mack cant check it unless the light is on when they are there. so i really need some help. has this happened to anyone else?

whenever i have had a problem with my mack they always plugged a diagnostic computer into the truck . The computer will read any faults. I run a schwing and if your air pressure gets low it will idle the motor down,when the air builds back up you can throotle up again.

I have the prob on a putz. first thing to check is cruise control switch then under the hood there is a relay that sends the signal to the back end that goes bad.