Hopper System125Service Manual – Advance 7765 / Nilfisk CR1500Open Hopper Dump DoorWhen the hopper dump door lever is moved to the “open” position, the oil flows through the check valve onthe Hopper Dump Cylinder Valve and to the bottom port on the Dump Cylinder to open the hopper dump door.Note that the incoming oil pressure will open the Pilot on the Check Valve on the Dump Cylinder to allow oilto flow from the top port on the Dump Cylinder. The Check Valve keeps the hopper dump door closed until oilpressure is applied to the bottom port on the Dump Cylinder and to the Pilot on the Check Valve.The oil from the top port on the Dump Cylinder flows back through the Hopper Dump Cylinder Valve, then to thereturn line to the Oil Cooler, Filter and Reservoir.Lift CylinderAC DBDump CylinderTo ScrubBrush MotorsTo MainBroom and DustControl MotorsFrom MainBroom and DustControl MotorsFrom ScrubBrush Motors.75GPMMain ControlValvePP1123T4Return BlockOutHopperControlValveInOilCoolerFilter9.7 GPMMain BroomSolenoid (2)Normal RotationBrush (4)ReverseRotationBrush (3)To SideBroomValveHopper LiftCylinder ValveHopper DumpCylinder ValveCloseDoorCheckValvew/PilotLiftHopperHopperDownOpenDoor1.02CIRReservoirAuxiliaryPumpTo ReturnBlock2500PSIReliefValveT1
