Case 580SR Service Manual page 729

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The steering system shows these features:
Z double acting, type steering cylinder on both 2 and
4WD axles;
Z common oil tank with the main hydraulic system;
Z a tandem gear pump located on the rear of the
transmission; both pumps are driven by a shaft run-
ning directly off the flywheel.
Oil is drawn through the common inlet port into both
pumping elements.
The front pump flow is directed to the loader and
backhoe control valves and side shift clamping sys-
tem.
Rear pump flow passes through the flow divider
valve which maintains priority oil flow to the steer-
ing system with remaining flow directed for stabiliz-
ers, loader and backhoe elements.
The flow divider, located on the rear of the pump,
comprises a load sensing valve and steering sys-
tem pressure relief valve.
The valve ensures a priority oil flow to the steering
system while the steering is operated, with the re-
maining flow directed to the stabilizer, loader and
backhoe circuits;
Z Load sensing power steering.
SECTION 41 - STEERING SYSTEM
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