167
(2) Raising position.
When the position control lever is moved to the raise position, the control valve spool (4) is moved inward. The oil
passages of the control valve spool are opened and oil flows through passage (10), to the check valve (7).
The oil pressure against the check valve overcomes the check valve spring and lift cylinder oil static pressure on the
check valve, raising the check valve off its seat and allowing oil to flow to the lift cylinder to raise the implement.
When the oil pressure in the system exceeds 14.7 MPa (150 kgf/c
㎡
) (2133 psi.), the relief valve (3) opens and oil is
returned to sump.
490Y
Oil flow
-
Raising position.
1.
Oil filter
2.
Oil pump
3.
Relief valve Ass'y
4.
Valve spool
5.
Shut-off valve
6. Lowering valve
7. Check valve
8. Lift cylinder
9. Implement
10. Oil passage
Содержание ST330
Страница 5: ...1 Chapter 1 GENERAL...
Страница 29: ...24 2 1 Engine Sectional View 100Y 101Y...
Страница 49: ...44 13 Oil flow 138Y V Suction filter W Oil pump X Relief valve Y Oil filter Z Oil pressure switch...
Страница 74: ...64 Chapter 3 TRACTOR MAIN BODY...
Страница 96: ...86 1 SECTIONAL VIEW 360Y 3 4 Transmission 1 for HST...
Страница 98: ...88 2 HST unit 362Y...
Страница 127: ...117 2 Two Speed PTO Model 403Y 9 3 Transmission Without one way clutch 2 Speed PTO...
Страница 197: ...186 2 COMPONENT LOCATION 517Y...
Страница 245: ...233 4 WIRING 518aY...
Страница 246: ...234 518bY...