Right Turn Position

STEERING CONTROL VALVE - TM-5-3805-258-24-1_256

TM-5-3805-258-24-1 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Manual
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S T E E R I N G S Y S T EM A M P L I F I E D S T E E R I N G S Y S T EM spool moves, oil that is pushed from the left end of the spool flows through metering orifices (1). The oil flows through passage (3) to the spring end of spool (12). The spool movement goes on until the orifices Right Turn TM 5-3805-258-24-1 S Y S T E M S O P E R A T I O N are blocked and flow through them is stopped. This movement of the spool stops the flow of pressure oil to the steering cylinders. Position STEERING CONTROL VALVE IN RIGHT TURN POSITION 1. Metering orifices. 2. Paaaage. 3. Pasaage. 4. Outlet for left turn. 5. Outlet to tank, 6. Outlet for right turn. 7. Metering orifices. 8. Spring. 9. Inlet (from right 15. Inlet (from steering neutralizer valve). pump). 10. Inlet (from left 16. Ball resolver valve. neutralizer valve). 17. Pasaage. 11. Orifice. 16. Flow control valve. 12. spool. 19. Pilot valve (relief valve). 13. Return paaaage. 14. Paaaage. When the steering wheel is turned to the right, pilot oil is sent through the right neutralizer valve to inlet (9). The oil flows into the chamber for spring (8). There is a pressure increase at inlet (9) which moves the spool to the left. The amount of spool movement is controlled by the rotation of the steering wheel. If there is a slow rotation of the steering wheel, there will be a low volume of pilot oil and less spool movement. A slow turn is the result. A faster rotation of the steering wheel gives a larger volume of pilot oil. The result is more spool movement, and a faster turn. Pilot oil flows from the spring chamber across metering orifices (7). This oil flows through passage (2) to the left end of the spool. The oil then goes through inlet passage (10), through the left neutra- lizer valve to the hand metering unit (HMU). The HMU lets the oil return to the hydraulic tank. With the spool moved to the left, oil from the steering pump section can flow from inlet (15), through slots in the spool, into outlet (6). This oil flows to the head end of the left steering cylinder, and the rod end of the right steering cylinder. The pressure of this oil moves the cylinder rods and the machine turns to the right. When pressure oil enters outlet (6), the pressure moves ball resolver valve (16). The pressure of the oil to the cylinders is felt through passage (17), against pilot valve (19) and flow control valve (18). 3-65

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