Case 580SR Service Manual page 734

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8
STEERING CONTROL VALVE
The steering control valve is located just above the
rear axle attached to the main chassis.
Remove the four pipes and then the 2 chassis fixing
bolts, then withdraw the valve for overhaul.
Draw a diagonal line across the complete valve
block this will assist in the correct reassembly later.
The valve consists of a central manifold block which
all input and output pipes are attached to. On each
side of this block is a solenoid valve. The solenoid
valves have two positions: both of these positions
are working positions and there is no neutral point.
Each spool is detented and therefore the solenoids
are only energized momentarily to move the spool.
On the end of each solenoid is an emergency hand
operating pin which moves the control spool without
energizing the solenoid. The switching of the steer-
ing valve is normally controlled by a microprocessor
located underneath the right hand side console.
1. Solenoid knob
2. Solenoid
3. Control spool
4. Block
5. Central block
6. Fixing screws
SECTION 41 - STEERING SYSTEM
7. Piston
8. O-ring
9. O-ring
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