TM 5-2410-240-23-1
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ELECTRO-HYDRAULIC CONTROLS CONTINUED
9. Right Pivot Turn
N OT E
The pivot turn is performed without brake engagement.
The machine ECM (Figure 17, Item 2) interprets two signals and determines that the joystick (Figure 17, Item 1) is
in the FORWARD and PIVOT RIGHT position. The machine ECM sets the duty cycle for the motor displacement
control solenoid (Figure 17, Item 7) between 33% and 70% and the duty cycle for the motor displacement control
solenoid (Figure 17, Item 8) at less than 33%. These solenoids are located in the left and right hydrostatic drive
motors, respectively.
The machine ECM (Figure 17, Item 2) also sets the duty cycle for the reverse solenoid (Figure 17, Item 6) at less
than 23.5% and the duty cycle for the forward solenoid (Figure 17, Item 4) at less then 26%. These solenoids
adjust the proportional solenoid valves in the right side hydrostatic pump.
The machine ECM (Figure 17, Item 2) also sets the duty cycle for the reverse solenoid (Figure 17, Item 5) at less
than 23.5% and the duty cycle for the forward solenoid (Figure 17, 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 17, Item 2) varies the duty cycle to the motor displacement solenoid (Figure
17, Item 7) in the left hydrostatic drive motor and the duty cycle to the forward solenoid
(Figure 17, Item 3) in the left side hydrostatic pump based on signals received from the
travel speed switch in the joystick (Figure 17, Item 1). The machine ECM also adjusts the
duty cycles based on signals received from the engine speed sensor (Figure 17, Item 11)
and the motor speed sensors (Figure 17, 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 17. Machine ECM Inputs and Outputs for Right Pivot Turn.
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