GENERAL INTRODUCTION
1 - 8
CX EXCAVATORS
EXPLANATION OF CX SERIES
Travel CX130/CX160/CX200/CX220
The travel motors are located at the rear of each track assembly. The travel system is
controlled by control spools in the main control valve located in the machine upper section.
The travel drive system has independent, compact, axial piston, two speed hydraulic motors.
Each track is independently driven by a sprocket driven by a planetary reduction unit. There
is a spring applied hydraulically released disc brake built into each motor. The travel brake is
released by the travel pressure applied to the motor. Each travel motor is equipped with a
counterbalance valve and a dual stage relief valves for smooth starts and stops. The
counterbalance valve prevents over speeding of the motor while driving down an incline. The
shockless relief valve allows for additional cushioning in the circuit by allowing a slight
transfer of oil between travel directions as the unit is started and stopped. The travel motors
and reducers are mounted within the width of the side frame. Two-speed travel is controlled
by the contr9oller, which controls a solenoid valve. The travel speed solenoid supplies pilot
circuit pressure to actuate the two-speed spool in each drive motor. Travel drive pressure is
then ported through the two-speed control spool to the motor swash plates. The machines
are in “LOW SPEED” travel when the key is turned on. When the travel switch is depressed
the machine will be in “HIGH SPEED” and if the drive load is to high the motor will
automatically shift to “LOW SPEED” and back to “HIGH SPEED” when the load is reduced.
The travel systems have a travel priority function to insure straight travel capability if the
swing function or any attachment function is activated, while traveling. When traveling without
other functions activated, one pump supplies right travel with the other pump supplying left
travel. When the travel priority spool shifts, because of multiple function application, one
pump is used to supply both right and left travel while the other pump is used for the
attachment functions. With one pump supplying, both travel functions, the travel speed will
naturally be reduced significantly.
Travel
MODEL CX130 CX160 CX210 CX240
L Speed
2.1
H Speed
3.4
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