The steering wheel

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 The steering wheel is connected to spool (1) by a shaft assembly and splines. When the steering wheel is turned, spool (1) turns a small amount until springs (7) are compressed. Then sleeve (2) starts to turn. As long as the steering wheel is turned, the spool and sleeve both turn as a unit, but they turn a few degrees apart. When the spool and sleeve are a few degrees apart, oil passages are opened between them. This lets the pump oil from inlet (4) flow through passages in body (11) to the metering section. When the steering wheel is turned, pin (8) turns with the sleeve and causes drive (12) to turn also. The drive causes a rotation of gear (5) inside gear (6). This rotation of the gear sends a controlled (metered) flow of pilot oil back through body (11). This oil flows to port (9) or (10) and then to the neutralizer valve. Port (9) or (10), that is not used for pilot oil, is used for return oil from the other end of the control valve spool. If the steering wheel rotation is stopped, springs (7) will move sleeve (2) back in alignment with spool (1) (NEUTRAL position). This will close passages between the metering section and control section and the HMU will be in the NEUTRAL position. NOTE For the following paragraphs on this page, refer to the illustration on page 3-62. When the engine is running, a check valve prevents pump oil at inlet (4) from flowing to outlet (3) then to tank. But, if the pilot section of the oil pump fails while TM 5-3805-258-24-1 S Y S T E M S O P E R A T I O N P U M P G E A R S I N M E T E R I N G S E C T I O N 5. Internal pump gear. 6. External pump gear. 8. Pin. 12. D r i v e . the engine is in operation, then the check valve will open. This lets tank oil at outlet (3) flow to inlet (4) for temporary operation of the steering pilot system. If the engine should stop, the check valve opens to let oil at outlet (3) go into inlet (4). This oil is used to operate the steering pilot system when supplemental steering is part of the steering system. 3-63

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