The bentley manual states that "Pumps from service parts inventory do not contain fluid. They must be filled with hydraulic fluid, G 002 000 before installation and turned by hand, otherwise pump noise or damage can result in initial operation."
Steps for installation: 1.Fill PS pump w hyd fluid 2.Fill the pump w fluid thru the suction pipe 3.Turn pump hub by hand until oil runs out the pressure side. 4.Then install the pump on its bracket 5 Then connect low pressure intake hose and pressure side hose w new crush washers for banjo bolt.
Did u work the pump w oil before running it, or did u install it dry?