You must have a minimum of 8-1/2" of dovetail with 6" runby and 2-1/2" stroke buffers. These numbers are critical for the system to be able to correctly re-sync. If these numbers are right, when the car drops to the springs, the bottom 2 jacks are bottomed out, check valves open and 2-1/2" left on the upper stage. The jacks are not meant to fall away from the platten, this creates the possibility to suck air. The Jump Bolts are only for inertia, keeps the jacks from pulling apart if the car hits the stop rings at full speed. The jump bolts have to be free and turn by hand or the holes on the platten should be torched out to prevent binding. Jacks need to be level to each other and buffers level. Make sure O30 is set to 1 and JRT about midnight so the car syncs every night. Try a quart of CAT oil but it needs to be poured directly into the jacks to really help. Always do a manual re-sync before you leave ( pull springs and manual lower the car), set a piece of paper on the buffer stands to make sure the bolster channel doesn't touch the stands. It won't if runby/ dovetail are right. If it still shuts down on a 1068, re-pack it but replace every seal and all the check valves while you're in there.