System is important for the hydraulics as the machine

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system is important for the hydraulics as the machine will be easily contaminated as it works at dirty and dusty environment. The encapsulated filter is mounted in an external chamber from tank in the Caterpillar excavator. Furthermore, the filtration system can extend the hydraulic system life and make it reliable for a long time. Next, the component layout also contributes important role for the hydraulic system efficiency. In the Caterpillar machine, the component layout is located closely together compared to Hitachi. As it is located close together, it will allow for the shorter tubes and lines between the main pumps, control valves and hydraulic tank. The machine hydraulics efficiency can be improved and be more reliable as the friction loss cause by the longer tubes can be reduced. Besides, the pressure drops in the hydraulics also can be avoided and decreased as the component layout located close together. The hydraulic system in the Caterpillar have been improved very well by adding cross-sensing system to their machine hydraulics. Under all operating conditions the system
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