SCHEMATIC OF HYDRAULIC SYSTEM FOR EJECTOR RETURN
1. Elevator hydraulic motor.
9. Vent line (for carry check
15. Ejector cylinder.
22. Door check valve.
2. Bowl cylinder (two).
16. Oil line.
23. Pump (elevator).
3. Control valve.
10. Relief valve.
17. Oil line (for steering).
A RETURN (close)
4. 5. Oil lines (for ejector
11. Oil line (for elevator
18. Pilot oil line.
B. HOLD position.
and door cylinders).
19. Door cylinder.
C. EJECT (open) position.
6. Carry check valve (two).
12. Elevator control valve.
20. Filter and tank.
7. Bowl valve spool.
13. Return oil line.
21. Pump (bowl and
8. Elevator speed valve.
14. Relief valve (elevator).
Ejector Return (Close)
The ejector control lever is held in the RETURN position
by the detent balls on the ejector spool When it is in
RETURN position (A). The oil from pump (21) in line (16)
goes out of control valve (3), through line (5) into the rod
end of ejector cylinder (15) and through door check valve
(22) into the head end of door cylinder (19).
The area of the piston in the door cylinder is more than
the area of the piston in the ejector cylinder so the door
cylinder piston moves first. The pump oil in the head end
of the door cylinder pushes the piston and rod,
connected to the door of the bowl, and the door closes.
Now, the pump oil in the rod ends of the ejector cylinder
pushes the piston and rod, connected to the ejector, and
the ejector is pulled to the back of the bowl. When the
ejector cylinder cannot move the ejector any farther and
the guide near the front *of the bowl stops the
movement of the door, the pressure of the pump oil
increases in the cylinders, lines and control valve (3).
When the pressure of the pump oil gets to approximately
1900 psi (134 kg/cm2) (13 110 kPa), the hydraulic
ejector kickout, in the valve spool housing on control
valve (3), moves the ejector valve spool to HOLD
The HOLD position (B), of the ejector valve spool, stops
the oil in lines (4) and (5) and the ejector and door can
not move until the ejector control lever is moved.
Eject (Open) (No Illustration)
Hold the control lever in EJECT position and it keeps the
ejector valve spool in EJECT position (C) in control valve
(3). The oil from pump (21) in control valve (3) goes
through line (4) into the head end of ejector cylinder (1 5)
and into the rod end of door cylinder (19). The