Theory of Operation
PROPEL FLOW CONTROL VALVE OPERATION
in the orifice and check valve (A) assembly to
The propel flow control valve (K) is used to reduce
gradually shift the propel flow control valve spool (D).
shock loads from the power passage (G). The shock
The gradual shift of spool slowly restricts the flow of
loads are caused by the operation of dig functions
supply oil to the left propel valve reducing any shock
upstream of the left propel valve (B).
The propel flow control valve is located in the power
The pilot pressure signal is released quickly through
passage to the left propel control valve.
the check valve when all dig functions are returned to
neutral. The propel flow control valve spool is shifted
When a dig function (H) is actuated while propelling,
quickly to the open position by the spring.
the pilot pressure signal also flows through the orifice