TM 5-3805-258-24-1H Y D R A U L I C S Y S T E MS Y S T E M S O P E R A T I O NCOUPLING HITCH ATTACHMENT CONTROL VALVECOUPLING HITCH ATTACHMENT CONTROL VALVE(Attachment Valve Spool in CLOSE or LOWER and Lift and Tilt Valve Spools in HOLD)1. Chamber for pilot oil.6. Load check valve for9. Passaga to drain.12. Passaga for pump2. Springs.attachment circuit.10. Passage to haad and of3. Attachment valvespool.7. Inletpassage for13. Tilt valve spool.attachment cylinders.14. Lift valvespool.4. Paasage.implement oil.11. Passage to rod end of5. Spring.15. Outlet passage to6. Chamber for pilot oil.attachment cylindars.hydraulic tank.This optional valve has all of the components that(3). This spool is a spring-centered, open center, pilotoil.are in the lift and tilt control valve along with anoperated spool with three positions: OPEN oradditional spool. Attachment valve spool (3) is usedRAISE, HOLD and CLOSE or LOWER. Springsto control an attachment such as a log fork, side(2) keep the spool in HOLD position when there is nodump bucket or multi-purpose bucket. This spool ispilot pressure oil in chambers (1) and (8). Movementbefore (ahead of) the lift and tilt valve spools in theof the spool is controlled by pilot pressure oil from theimplement hydraulic circuit.attachment (third) pilot valve in chambers (1) andAttachment (Third) Valve Spool(8).Oil from the implement pump section goesthrough inlet passage (7) to attachment valve spool3-107
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