Originally Posted by TdogKing
Funny there are millions of hydraulic rams on equipment all across the nation and they never spray or wipe anything on them and some of them sits for years idle before being put in service again...just saying
Good question. Most rams used on heavy equipment use hydraulic pressure to operate the ram in either direction. Jacks use the vehicle weight and springs to retract the shaft back into the cylinder. Bottle jacks use gravity to help pull the shaft back into the cylinder. If you turn a bottle jack upside down, like our leveling jacks the shaft does not retract. Absent leaks, bent shafts, or faulty valves, poor performing springs seem to be the main cause of slowly retracting leveling jacks. Today, I am prepping a set of springs to be installed in a 2005 Winnebago Vectra's HWH system. I bet after the install the jacks will retract like new.