TM 5-2410-240-23-1
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ELECTRO-HYDRAULIC CONTROLS CONTINUED
10. Right Counterrotate Turn
The machine ECM (Figure 19, Item 2) interprets two signals and determines that the joystick (Figure 19, Item 1) is
in the FORWARD and COUNTERROTATE RIGHT position. In turn, the machine ECM sets the duty cycle for the
motor displacement control solenoids (Figure 19, Items 7 and 8) between 33% and 70%. These solenoids are
located in the left and right hydrostatic drive motors, respectively.
The machine ECM (Figure 19, Item 2) also sets the duty cycle for the reverse solenoid (Figure 19, Item 6) between
23.5% and 86% and the duty cycle for the forward solenoid (Figure 19, Item 4) at less then 26%. These solenoids
adjust the proportional solenoid valves in the right side hydrostatic pump.
The machine ECM (Figure 19, Item 2) also sets the duty cycle for the reverse solenoid (Figure 19, Item 5) at less
than 23.5% and the duty cycle for the forward solenoid (Figure 19, Item 3) between 26% and 88.5%. These
solenoids adjust the proportional solenoid valves in the left side hydrostatic pump.
N OT E
The duty cycles determine the angle of the pump and motor swashplates. The machine
ECM (Figure 19, Item 2) varies the duty cycles based on signals received from the travel
speed switch in the joystick (Figure 19, Item 1). The machine ECM also adjusts the duty
cycles based on signals received from the engine speed sensors (Figure 19, Item 11) and
the motor speed sensors (Figure 19, Items 9 and 10) in order to prevent an overspeed,
underspeed, or stall condition, and to ensure the machine is tracking in a straight line.
Figure 19. Machine ECM Inputs and Outputs for Right Counterrotate Turn.
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