TM 5-3805-260-24The flexible cables from the control levers, for bowlDOWN or UP, for ejector RETURN or EJECT, connectto the valve spools in the control valve. Relief valve (I), inthe control valve, is in the oil circuit from the pump toeither the bowl I or the ejector and door cylinders.When the bowl lift lever is in the HOLD position, bowlvalve spool (6) is in HOLD position (B). The oil from thepump goes through the control valve, through outlet (12)and to the tank.Move the lift lever to the DOWN position and itmoves bowl valve spool (6) to DOWN position (C). Now,the oil from the pump goes out opening (2) to the headends of the bowl cylinders. The pump oil in the headends pushes the pistons and rods, connected to thebowl, and the bowl goes down.CARRY CHECK VALVE15. Fitting (for vent line to control valve). 16. Oil lineopening In valve body.As the pistons in the bowl cylinders go down, theypush the oil from the rod ends through opening (17).The oil pushes check valve (18) open and then goesthrough opening (16) and the oil line to the control valveopening (4). The rod end oil goes. through the controlvalve and through outlet (I1) to the tank.15. Fitting (for vent line to control valve). 16. Oil lineopening. 17. Opening (to the rod end of the cylinder).18. Check valve.The rod end oil from the bowl cylinder opens checkvalve (18) only when bowl valve spool (6) is in DOWNposition (C). Hole (7), in the valve spool, is in passage(8) with the valve spool in HOLD position. Oil from thespring chamber in check valve (18) is pushed throughfitting (15) and the oil line into passage (8). The oil inpassage (8) goes through hole (7), through the passagein the center of the valve spool and out hole (5) into theoil that goes through outlet (I ) to the tank.Move the bowl lift lever to the UP position and itmoves bowl valve spool (6) to UP position (A). Now, theoil from the pump in the control valve goes out throughopening (4), through the oil line into opening (16) in thecarry check valve. The pump oil opens check valve (18)and goes through opening (17) into the rod ends of thebowl cylinders. The pump oil in the rod ends pushes thepistons and rods, connected to the bowl, and the bowlgoes up.The pump oil through opening (16) pushes on thestep surface of check valve (18) to open the valve. Thepump oil opens the check valve because, when bowlvalve spool (6) is in UP position (A), hole (9) is then inpassage (8) and the oil in the spring chamber of checkvalve (18) goes through fitting (15), the oil line and intopassage (8). The oil in passage (8) goes through hole (9)out of hole (5) and into the oil that goes through outlet(11) to the tank.The HOLD position (B) for valve spool (6) stops theoil in passage (8), in the oil line and fitting (15) and in thespring chamber of check valve (18). The oil from the rodends of the bowl cylinders in opening (16), of the carrycheck valves, can not open the check valves and thiskeeps the bowl up until the bowl lift lever is moved.Control Valve (Ejector Circuit)Hold the ejector-floor lever in the OPEN-EJECTposition and it moves ejector valve spool ( 13) to EJECTposition (D). The pump oil through inlet (3) goes throughthe control valve, out through opening (12) to the rod endof the door cylinder and also to the head end of theejector cylinder. The pump oil in both cylinders firstmoves the piston and rod, connected to the door, toopen the door. The door cylinder piston moves firstbecause it has a larger diameter than the ejector cylinderpiston. The pump oil in the head end of the ejectorcylinder moves the piston and rod, connected to theejector, to move the ejector forward.The pump oil in the rod end of the door cylinder canmove the piston, which moves the oil from the head end,because pump oil in the line through opening (17) movescheck valve (19) down and the check valve is open. Withthe check valve open, the oil pushed from4-22
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