Give a call to a place called A & A Hydraulic in Cleveland, 800-992-9898. Bernie was the guy there. They are an old time Blackhawk jack service center. See if they can provide any advice.

All the old Blackhawk jacks and Porto Power equipment made during the Applied Power days (this jack) were sold to Hein Werner Corp in 1986. Hein Werner sold the jack business to Lincoln/Pentair in 1992. The trade name is now owned by Shinn-Fu America. I doubt there is a lot of OEM support, but again, you could try A & A.

Any older Blackhawk jack with a 67xxx part number was a USA jack. Anything labeled as "Banner" 65xxx or 68xxx was an import.