THEORY OF OPERATION - CONTINUED
STEERING SYSTEM - CONTINUED
When a constant flow of oil is demanded by a hydraulic circuit for work tool or steering circuit, supply oil pressure
from pump outlet will increase on right side of flow compensator spool. Pressure on left side of flow compensator
spool is sum of load sensing signal and margin spring pressures. When flow demand is met, flow compensator
spool will meter force on both ends of spool. Once forces become equal on each end of spool, system will stabilize.
Swashplate is held at a relatively constant angle to maintain required flow.
Difference between load sensing signal pressure and supply oil pressure is called margin pressure.
Margin pressure is value of margin spring.
Margin pressure is adjusted by turning adjustment screw on flow compensator spool.