SCRAPER CONTROL VALVE - TM-5-3805-260-24

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
Page Navigation
603

TM 5-3805-260-24 the head end of the door cylinder goes through the line to opening (15), through check valve (19) and out the line from opening (18) to the control valve (tank). SCRAPER CONTROL VALVE 1. Relief valve. 2. Opening (to bowl cylinders). 3. Inlet (pump). 4. Opening (to bowl cylinders). 5. Hole. 6. Bowl valve spool. 7. Hole. 8. Passage (from carry check valves). 9. Hole. 10. Opening (for rod end of ejector and head end of door cylinder). 11. Outlet (to tank). 12. Opening (for head end of ejector and rod end of door cylinder). 13. Ejector valve spool. 14. Ejector kickout valve. A. UP position. B. HOLD position. C. DOWN position. D. EJECT (open) position. E. HOLD position. F. RETURN (close) position. DOOR CHECK VALVE 15. Opening (for head end of door cylinder). 16. Seat. 17. Opening (from rod end of door cylinder and head end of ejector cylinder). 18. Opening (to control valve and rod end of ejector cylinder). 19. Check valve. When ejector valve spool (13) is in RETURN position (F), detent balls in ejector kickout valve (14) keep the valve spool and the control lever in the RETURN position. The pump oil in the control valve goes out through opening (10) to the rod end o, the ejector cylinder and through the door check valve to the head end of the door cylinder. DOOR CHECK VALVE 15. Opening (for head end of door cylinder). 17. Oil line from rod end of door cylinder and head end of ejector cylinder. 18. Opening (for oil line to control valve and rod end of ejector cylinder). The pump oil through the line to opening (I 8), in the door check valve, goes through the passage in check valve (19), pushes seat (16) open and then goes through opening (15) and the line to the head end of the door cylinder. The pump oil in the head end of the door cylinder moves the piston and rod, connected to the door, to close the door. The pump oil in the rod end of the ejector cylinder now moves the piston and rod, connected to the ejector, to move the ejector to the rear of the scraper. When the piston can not move the ejector any farther, because it is against a stop, the pressure of the pump oil increases. EJECTOR KICKOUT VALVE 20. Orifice (in valve spool). 21. Poppet valve. 22. Piston. 23. Spring (for valve spool). 24. Plunger. 25. Detent ball (three). 26. Detent (in housing). E. HOLD position of valve spool. F. RETURN position of valve spool. The pump oil is also in a passage, in ejector valve spool (13), through orifice (20) against poppet valve (21) when the valve spool is in RETURN position (F). When the pressure of the pump oil in the rod end of the ejector cylinder, the head end of the door cylinder and through orifice (20) in valve spool (13) increases to 4-23

Privacy Statement
Press Release
Contact