Kohler K91 Owner's Manual page 296

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3.4297.4:29
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3.4297.430
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3.4297.431
When the spool valve is offset, oil is directed
into the bottom end of the cylinder and the
piston rod is extended. Notice that oil from the
opposite side of the piston also passes through
the spool valve and back to the reservoir.
When the pressure in the cylinder reaches the
setting of the pressure relief valve, the valve
opens and directs the oil flow back to the
reservoir. This happens when a high resistance
is met, such as the cylinder reaching the end of
its" stroke.
When the spool valve is offset in the opposite
direction, the oil flow through the valve and
cylinder is reversed.
Productivity Series
20