ELEVATOR SPEED VALVE

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
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TM 5-3805-260-24 ELEVATOR SPEED VALVE 2. Transmission. 8. Valve spool (in LOW SPEED position). The elevator speed valve is beside transmission (2) on the right side of the machine. The flexible cable from the elevator speed lever is connected to valve spool (8) in the speed control valve. ELEVATOR SPEED VALVE 8. Valve spool. 9. Outlet (to the tank). 10. Inlet from pump. 11. Outlet (to hydraulic motor). H. HIGH SPEED position. L. LOW SPEED position. Hydraulic elevator motor Oil from the pump goes through inlet (10) and through outlet (9) to the tank when valve spool (8) is in LOW SPEED position (L). When the elevator speed lever is moved to the HI position as shown, the flexible cable moves valve spool (8) to HIGH SPEED position (H). Now, the pump oil through inlet (10) goes through outlet (11) and to an oil line from the other pump section. The oil from both pump sections goes to the elevator motor and runs the elevator at high rpm. SCRAPER VALVES Control Valve (Lift Circuit) The scraper control valve is beside the transmission near the right side of the machine. SCRAPER CONTROL VALVE 1. Relief valve. 2. Line (to head ends of bowl cylinders. 3. Inlet (pump). 4. Line (to rod ends of bowl cylinders). SCRAPER CONTROL VALVE 1. Relief valve. 2. Opening (to head ends of bowl cylinders). 3. Inlet (from pump). 4. Opening (to rod ends of bowl cylinders). 5. Hole (to passage in valve stem). 6. Bowl valve spool. 7. Hole (to passage In valve stem). 8. Passage (from vent line for carry check valves). 9. Hole (to passage In valve stem). 10. Opening (to ejector and door cylinder). 11. Outlet (to tank). 12. Opening (to ejector and door cylinder). 13. Ejector valve spool. 14. Ejector kick-out valve. A. UP position. B.HOLD position. C. DOWN position. D. EJECT (Open) position. E. HOLD position. F. RETURN (Close) position. 4-21

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