For hitachi excavator the used of the boom and stick

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and stick-in operation. For Hitachi excavator the used of the boom and stick circuit still conserve from the old-circuit and doesn’t receive a new circuit design. The efficiency of the boom and stick usage can be increased and cycle time also will be reduced after the regeneration circuit. Besides, the fuel efficiency also can be increased as it lowers the operating costs while maintaining high productivity of the machine. On the other hand, Caterpillar 340D2L has more advantages compared to Hitachi ZX300LC-6 as shown in Table 3.3. Based on the comparison made, Caterpillar rates higher in the hydraulics because it meets the criteria as it can deliver power and has high efficiency in hydraulics. Table3.3: Hydraulics Comparison Criterion Caterpillar 340D2L Hitachi ZX300LC-6 Tank size 175L 156L Filtration available Unavailable Component Layout Located close together Located far from each component Hydraulic cross- sensing Available Unavailable Auxiliary hydraulic valve Available as add-on Unavailable Boom and stick Regeneration circuit Maintain from existing circuit
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