It's been awhile since I've posted here. Wife's health and other assorted things have taken over. Anyway I've had the steering box rebuilt and it seems okay. This may seem simple but for the life of me I can't cure it. The leak seems to be coming from the connection that feeds the pump. I've replaced both copper washers but still have a leak at that joint. I did use some hyd line to feed the pump and that connection is secure. Anyone got any ideas?

 

There are washers intended for BSP flat faced hydraulic connections that have a rubber portion in the inside, they seal much better than copper washers. Any shop that deals in hydraulics or industrial machinery should have them, they come in a variety of sizes.

An example: https://www.greenlinehose.com/buy/pr...sp+bonded+seal

 

To help in the search: the bonded seal washer is often known as a Dowty washer after the company that invented (or popularised) them.