Recommended Hydraulic Component Clearances

 

Typical component clearances in microns

Anti Friction Bearings 0.5
Vane Pump (Vane tip to outer ring ) 0.5 - 1
Gear Pump ( Gear to side plate ) 0.5 - 5
Servo Valves ( Spool to sleve ) 1 - 4
Hydrostatic bearings 1 - 25
Piston Pump ( Piston to bore) 5 - 40
Servo Valves Flapper Wall 18 - 63
Actuators 50 - 250
Servo Valves Orifice 130 - 450