4-031
HYDRAULIC SYSTEMS
Operation
Neutral (when the steering wheel is not operated):
Spool (1) and sleeve (2) in the valve section have a slit
respectively, and centering spring (6) is set in the slit in
combination with a flat spring.
When steering wheel is not operated, spool (1) and sleeve (2)
are held in the neutral position by centering spring (6).
This Orbitrol is a load-sensing, non-load reaction normally-
closed type valve. All the oil holes of the spool are out of
place when Orbitrol is in the neutral position, and the flow
of oil from the hydraulic pump into the steering cylinder is
closed completely.
Swing (when the steering wheel is operated):
All the ports of the valve section are closed when Orbitrol is
in the neutral position. The oil in the rotor has been sealed
up, and rotor (4) is fixed.
Sleeve (2) is coupled with rotor (4) via cross pin (7) and drive
shaft (5), and it is fixed also.
When the steering wheel is operated, the turning force is
applied to spool (1), contracting centering spring (6) that has
been set in the slit.
As a result, the oil groove of spool (1) is aligned with the oil
hole of sleeve (2), opening the hydraulic circuit.
Consequently, all the four ports (hydraulic pump, tank, and
steering cylinder circuits on the right and left sides) open to
permit oil to flow, and rotor (4) rotates.
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SV414-04008
SV414-04009
1. Spool
2. Sleeve
3. Stator
4. Rotor
5. Drive shaft
6. Centering spring
7. Cross pin
8. Check valve
SV414-04010
Содержание SV414
Страница 1: ...SV414 SHOP MANUAL 3498 64214 0 ...
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Страница 23: ...SPECIFICATIONS ...
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