THEORY OF OPERATION - CONTINUED
HYDRAULIC SYSTEM - CONTINUED
As pump output flow in passage increases to meet system demand, pump supply pressure increases. When
output supply pressure equals signal oil pressure and pressure of margin spring, flow compensator spool
moves to a metering position and system is stabilized.
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.