Thanks to the hydrostatic travel transmission in excavators, you can select any speed mode, and even in the transport mode, speed indicators are selected automatically. The running gears of hydraulic motors with the presence of final drives are placed inside the tracked bogies, which are closed from the outside by means of casings. Hinges, as well as bearings inside the chassis and other mechanisms of special equipment are exposed to heavy loads, and in order to reduce wear, it is necessary to use JCB oils and greases, for more details see https://jcbdetal.com/masla-i-smazki"> ://jcbdetal.ru/masla-i-smazki . Functional hydraulic braking as well as onboard multi-disc braking systems can be automatically applied when the control levers are driven to neutral.
Even in modern excavators, a strong frame inside the undercarriage should be noted, the components of which can withstand torsional loads, a successful track design that prevents soil accumulation. It also eliminates the need for temporary lubrication of the hinge devices.
On some foreign-made machines, a choice of different operating modes is offered, which adapt to various degrees of load. It also provides an automatic transfer of the propulsion device to idle in case of no load. Not particularly long-term increases in digging force are still ensured.
Power plants in modern excavators are equipped with automatic fuel saving systems. When the control levers are transferred to the neutral position, the pumping device costs are minimized, and then there is a decrease in engine speed to idle. When any lever is returned to the working position, the speed indicators of the propulsion device increase to the initial values, and the flow rate of the pumping devices increases proportionally according to the indicators of the lever displacement. It also provides for the possibility of deliberately dropping the speed to idle by pressing a special button on the joystick. The hydraulic boom and stick devices are equipped with special "regeneration" circuits that allow for increased speed ratings associated with boom functions and stick extensions.
The turntable device can be driven by an axial hydraulic motor of the gearbox and braked with its help. The mechanical brake can be operated when the control lever is moved by turning to neutral, and also by activating the lever responsible for locking the control and stopping the engine�
