Shibaura ST330, Workshop Manual

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(3) Lowering position.
When the position control lever is moved to lowering position, the control valve spool (4) is moved forward. The plate
(10) and adjusting bolt (11) attached to the control valve spool, also moves forward and contacts the lowering valve
spool (6), pushing it off its seat.
The oil from the pump flows through the passage and opens the shut-off valve and return to sump as in the neutral
position.
The oil in the lift cylinder (8) flows through passage past the check valve (7) to the lowering valve spool and seat and
returns to sump permitting the implement to lower.
491Y
Oil flow － Lowering position.
1. Oil filter
2. Oil pump
3. Diverter valve Ass’y
(Relief valve Ass'y)
4.
Valve spool
5. Shut-off valve
6. Lowering valve
7. Check valve
8. Lift cylinder
9. Implement
10. Plate
11. Screw