GENERAL INTRODUCTION 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. 1 - 8 CX EXCAVATORS Travel MODEL CX130 CX160 CX210 CX240 L Speed 2.1 H Speed 3.4