TM 5-3805-262-34THEORY OF OPERATION (CONT)Oil Flow with Lift Spool Actuated.In this example,lift spool is moved out of con-trol valve assembly to raise loader frame.Lift spool stops oil flow through opencenter passage. When pressure in the open center passage increases, load check valveopens and lets oil flow to B port. Oil is sent from B port to closed end of liftcylinders.At the same time,oil that is pushed out of rod end of lift cylinders enters controlvalve assembly at A port.This oil flows through return passage to outlet port.3-637
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