1999 Volvo Penta "WT" Models Workshop Manual, Page 308Get this manual
5Fill pump reservoir with Volvo Penta Power TrimTiltSteering Fluid or OVIC Power TrimTilt and Power Steering FluidBleed pump, hoses, and valve by turning pulley clockwise (as viewed from front of engine) until reservoir no longer shows air bubblesKeep reservoir filled while purging air from system 6Install drive belt and adjust belttension as described under Belt Adjustment in this sectionDo not pry against pump reservoir while tightening belt
7Bleed entire system as outlined under Purging Air From
Steering System
Hydraulic Fluid
Use an approved power steering fluid such as Volvo Penta Power TrimTiftSteering Fluid or OVIC Power Trim'Tilt and Power Steering Fluid or GM Power Steering FluidIf these fluids are not available, any automatic transmission fluid labeled Dexron or Dexron 1 may be used