Case 580SR Service Manual page 731

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POWER STEERING - NEUTRAL
Pump pressure
Stand-by pressure
When the steering wheel is held still, the leaf springs
return and hold the power steering spool in the neu-
tral position.
This ensures no more oil is supplied to the steering
cylinder. The spool also traps the oil in the steering
cylinder and allows oil in the sensing lines to return
to tank therefore allowing the priority flow divider to
move to the left.
SECTION 41 - STEERING SYSTEM
Trapped oil
Return to oil tank
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