33 - 12
Travel Operation (TL, TR) Priority Circuit
(cont’d)
This circuit maintains linear travel when other operations are
carried out at the same time.
Oil from pump P1 (X) flows to the outlet port BL4 when pilot
pressure is applied at port bl4, by operating the travel lever
(or pedal) control. This flow is directed to the left hand track
drive.
Oil from pump P2 (Y) flows to the outlet port BR3 when pilot
pressure is applied at port br3, by operating the travel lever
(or pedal) control. This flow is directed to the right hand
track drive.
Swing Operation with Linear Travel
As the pilot signal, operated by the left hand joystick
controller, starts to operate the slew spool, the signal inside
the control valve is initially delayed. The delivery ports of the
left and right hand spools supplying oil to the travel motors
are connected to balance the flow to the drives. When the
pilot signal fully operates the slew spool, oil from pump P1
has priority flow to the slew motor and oil from pump P2
continues to supply the drives. In order to prevent sudden
changes in speed, surplus oil from the slew operation is
diverted to the left and right hand track drives.
Section E Hydraulics
9803/6410
Section E
33 - 12
Issue 1
Control Valve
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