older 643 machine , replacing drive motor hoses that come off the left (as sitting in the machine) side of the pump , I also want to replace the o-ring on the hose fitting attached to the pump but cannot break it loose with a standard beaker bar. I don't want to break anything , should I leave it alone or put a helper bar on my breaker bar and go at it? Or should I try some heat, only concern there is starting a fire with all of the oil thats spilled around in there.