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Operation
Note: The following description is for the slew operation.
Other operations are similar.
When right slew operation is selected by the control lever,
pressurised oil from the remote control valve enters port A1
in the shuttle block. The oil moves steel ball a to the left and
continues through port B1 to operate the right slew control
valve spool.
Pressurised oil entering port A1 passes through hole d into
chamber e and moves steel ball b to the left, allowing oil to
pass through port C1 to the slew pressure switch, and
through port S1 to the slew brake valve.
Return oil from the slew spool pilot control enters port B2
and moves steel ball c to the right, and returns to the remote
control valve via port A2.
Section E Hydraulics
9803/6410
Section E
55 - 4
Issue 1
Shuttle Valve
JS01990