We have a 25 year old Manitou 526 with a double action lever for third service but no option for constant pumping. We have a post driver with external controls and so far have been making it work by holding the third service lever in the cab on flow with a bungee. Is this a bad idea? Safety wise it seems fine as we don’t ever raise the weight unless we are going to let it fall on a post so if the bungee were to fail, the worst that would happen is the weight would drop on the post. I’m more thinking if it’s bad for the hydraulics. Any advice much appreciated.