• Remove the cap on the fill port.
• Attach the damper charging device (don't secure the stem extender)
• Fill the hose with hydraulic fluid
• Secure the stem extender
• Attach an air hose with 80-100 psi to the damper charging device
• Watch the indicator and it should start extending outward (if it not moving, see below)
• Back off the bleeder screws slightly and allow any air and some fluid to escape before tightening
• Fill until the first graduation on the status indicator is about 1/4 inch from the damper (another graduation will appear if you over charge - just bleed off the pressure if this happens)
• Replace and safety cap as well as bleeder screws

Initually, mine would not take the charge. A "check valve" is combined with the fill port. I removed the set screw and removed the port/valve. I thought I would find it frozen however it was working fine. The rubber stopper covers a very small fill hole at the center of the cylinder. When pressure is applied, the stopper is pushed back and fluid should flow around the stopper. My stopper was hand made and either swelled or was cut too big and would not allow fluid flow around it even though the stopper was pushed away from fill hole. I cut a small corner off that would allow the flow but still allow it to cover the hole. Assembled and retried - filled fine (number 3 was the culprit).