Case 580SR Service Manual page 732

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6
POWER STEERING - TURNING RIGHT
Pump pressure
Metered pressure
When the steering wheel is turned, the movement of
the power steering spool forms a series of passag-
es. During right turn, oil flows through the spool
along a groove and into a passage in the housing
which leads to the metering unit. A gallery is also
lined up to allow pressure oil to flow down the sens-
ing line to the priority flow divider.
As the metering unit is turned by the drive shaft, it di-
rects a measured quantity of oil along another set of
passages in the spool then from these to the steer-
ing cylinder.
Return oil from the other side of the cylinder is di-
rected through the spool to a return passage in the
housing.
SECTION 41 - STEERING SYSTEM
Trapped oil
Return to oil tank
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