System for providing rotary power to implements of machines

1 . A system for providing rotary power to an implement of a machine, the system comprising:

one or more ground engaging members configured to move the machine along a ground surface;

a first motor control valve associated with a first motor; and

a second motor control valve associated with a second motor,

wherein:

the first motor control valve is biased towards a first state and the second motor control valve is biased towards a third state, the first and third states corresponding to a higher speed, lower torque drive of the implement via the respective first and second motors,

when the second motor control valve is in the third state, the first motor control valve is configured to be actuated at a first shift point, from the first state to a second state, that combined with the third state of the second motor control valve, corresponds to a lower speed, higher torque drive of the implement via the respective first and second motors,

when the first motor control valve is in the second state, the second motor control valve is configured to be actuated at a second shift point, from the third state to a fourth state, that combined with the second state of the first motor control valve, corresponds to an even lower speed, even higher torque drive of the implement via the respective first and second motors,

the first and second shift points are based on loading of the implement,

the first and second shift points are different,

the higher speed, lower speed, and even lower speed are different fixed speeds,

the implement is driven at the higher speed and lower torque before reaching the first shift point,

the implement is driven at the lower speed and higher torque between the first shift point and the second shift point,

the implement is driven at the even lower speed and even higher torque after reaching the second shift point, and

the implement is a cutting drum.

2 . The system of claim 1 , wherein the first shift point of the first motor control valve corresponds to a first drive pressure communicated to the first motor and the second shift point of the second motor control valve corresponds to a second drive pressure communicated to the second motor.

3 . The system of claim 2 , wherein the first and second drive pressures are different from each other.

4 . The system of claim 1 , wherein the system further comprises a controller including:

one or more memories; and

one or more processors configured to:

actuate the first and second motor control valves at the corresponding first and second shift points.

5 . The system of claim 1 , wherein the first and second shift points are spaced, corresponding to loading of the implement, by at least 4000 kilopascals.

6 . The system of claim 1 ,

wherein at the higher speed, lower torque drive of the implement, the loading of the implement equals a first load,

wherein at the lower speed, higher torque drive of the implement, the loading of the implement equals a second load,

wherein at the even lower speed, even higher torque drive of the implement, the loading of the implement equals a third load, and

wherein the second load is relatively higher than the first load and is relatively lower than the third load.

7 . The system of claim 1 , wherein the first motor is coupled to a first end portion of the implement and the second motor is coupled to a second end portion of the implement.

8 . A machine, comprising:

one or more ground engaging members configured move the machine along a ground surface;

an implement configured to perform an operation on materials that the machine comes in contact with outside the machine, wherein the implement is a cutting drum;

a first motor and a second motor to rotatably drive the implement; and

a system configured to provide rotary power to the implement, the system including:

a first motor control valve associated with the first motor and a second motor control valve associated with the second motor,

wherein:

the first and second motor control valves are biased towards respective states that correspond to a first fixed implement drive speed for the implement, wherein the first fixed implement drive speed is a higher speed, lower torque drive of the implement,

the first motor control valve is configured to be actuated at a first shift point to shift the first motor such that the first motor and the second motor switch between the first fixed implement drive speed for the implement and a second fixed implement drive speed for the implement, wherein the second fixed implement drive speed is a lower speed, higher torque drive of the implement,

the second motor control valve is configured to be actuated at a second shift point to shift the second motor such that the first motor and the second motor switch between the second fixed implement drive speed and a third fixed implement drive speed for the implement, wherein the third fixed implement drive speed is an even lower speed, even higher torque drive of the implement,

the first and second shift points are based on loading of the implement,

the first and second shift points are different,

a first plurality of pressures is communicated to the first motor and the second motor at the first fixed implement drive speed, and

a second plurality of pressures is communicated to the first motor and the second motor at the second fixed implement drive speed.

9 . The machine of claim 8 , wherein the first shift point of the first motor control valve corresponds to a first drive pressure communicated to the first motor and the second shift point of the second motor control valve corresponds to a second drive pressure communicated to the second motor.

10 . The machine of claim 9 , wherein the first and second drive pressures are different from each other.

11 . The machine of claim 8 , wherein the first and second shift points are spaced, corresponding to loading of the implement, by at least 4000 kilopascals.

12 . The machine of claim 8 ,

wherein at the first fixed implement drive speed, the loading of the implement equals a first load,

wherein at the second fixed implement drive speed, the loading of the implement equals a second load,

wherein at the third fixed implement drive speed, the loading of the implement equals a third load, and

wherein the second load is relatively higher than the first load and is relatively lower than the third load.

13 . The machine of claim 8 ,

wherein the first motor includes a first swashplate and the second motor includes a second swashplate,

wherein on actuation of the first motor control valve, the first swashplate pivots to shift the first motor to the first fixed implement drive speed or the second fixed implement drive speed, and

wherein on actuation of the second motor control valve, the second swashplate pivots to shift the second motor to the second fixed implement drive speed or the third fixed implement drive speed.

14 . The machine of claim 8 , wherein the first motor is coupled to a first end portion of the implement and the second motor is coupled to a second end portion of the implement.