Yanmar EF-494T - Page 197

9 HYDRAULIC LIFT UNIT 9 HYDRAULIC LIFT UNIT
EF494T TM 06/2011 edition
189
Oil flow in lowering operation
Oil in hydraulic pump
(1) Tank
(2) Strainer
(3) Filter
(4) Hydraulic pump
(5) Intake block
(6) Relief valve
(7) Control valve
(8) Tank
Oil in hydraulic cylinder
(1) Cylinder
(2) Slow return valve
(3) Mechanical check valve
(4) Tank
Oil from the hydraulic pump opens the unload valve and returns
to the tank, likewise in the neutral condition. The oil in the
cylinder returns to the tank by opening the mechanical check
valve by moving the spool through the pin.
(A) Flow control valve
(B) Load check valve
(C) Mechanical check valve
(D) Tank
(E) Unload valve
(F) Main spool