Dale,

Garwood was a leader in hydraulic ram and hoists back in the 1930-40's. They got bought out by various companies. If you can get the shaft diameter and the housing OD, you should be able to source a replacement seal. Here is a great place to start: https://www.timken.com/pdf/7707_National%20Indust%20Seals%20Catalog.pdf
Odds are you can find someone selling the seal on ebay for pennies on the dollar. Let us know how it works out for you.

Paul

1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures