TM 5-3805-258-24-1
H Y D R A U L I C
S Y S T E M
S Y S T E M S
O P E R A T I O N
COUPLING HITCH ATTACHMENT CONTROL VALVE
COUPLING 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 for
9. Passaga to drain.
12. Passaga for pump
2. Springs.
attachment circuit.
10. Passage to haad and of
3. Attachment valve spool.
7. Inlet passage for
13. Tilt valve spool.
attachment cylinders.
14. Lift valve spool.
4. Paasage.
implement oil.
11. Passage to rod end of
5. Spring.
15. Outlet passage to
6. 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, pilot
oil.
are in the lift and tilt control valve along with an
operated spool with three positions: OPEN or
additional spool. Attachment valve spool (3) is used
RAISE, HOLD and CLOSE or LOWER. Springs
to control an attachment such as a log fork, side
(2) keep the spool in HOLD position when there is no
dump bucket or multi-purpose bucket. This spool is
pilot pressure oil in chambers (1) and (8). Movement
before (ahead of) the lift and tilt valve spools in the
of the spool is controlled by pilot pressure oil from the
implement hydraulic circuit.
attachment (third) pilot valve in chambers (1) and
Attachment (Third) Valve Spool
(8).
Oil from the implement pump section goes
through inlet passage (7) to attachment valve spool
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