Case CX Series - Page 197

HYDRAULICS – CX210/CX240
6 - 8
CX EXCAVATORS
TRAVEL
High Speed Travel
1) The Travel Speed solenoid is energized and the swash plate angle of the travel motors is
shifted to minimum angle, high-speed travel occurs. The monitor display will indicate high
speed (HI).
2) The travel motors will switch to low-speed automatically when the travel pressure reaches
approximately 4200 psi and switches back to high-speed when the travel pressure is
reduced. The monitor display does not change.
Note: The controller needs the travel pressure switch and an input signal from the engine
controller for high-speed travel.
High-speed travel occurs when the operator selects high-speed with the travel switch on the
control panel. The travel switch sends an electrical signal to the controller. A 24v signal is
sent by the controller to the travel-speed solenoid valve. When the valve is shifted, pilot
pressure (550/600 psi) is sent to the travel motors. The pilot pressure shifts the 2-speed
spool, which directs supply oil to shift the swash plate to minimum angle. The travel motors
will shift automatically to low-speed when the supply pressure reaches approximately 4200
psi. A pilot signal from the supply pressure inside the drive motors is routed to the 2-speed
spool to shift it to the low-speed position. When the supply pressure is reduced the drive
motors will shift back to high-speed. The controller will turn off the high speed solenoid if the
travel pressure drops below 580 psi to slow down travel going down a steep grade. The
travel speed solenoid valve is located in the six-solenoid valve bank. The six-solenoid valve
is located in the pump compartment.
Pilot Pressure Solenoid
Bl
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Wir
e
B
a
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d
Travel Speed Solenoid
Red Wire Band