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A hydraulic excavator cab is mounted on a viscous mount. When the weight of the cab is heavy, the neutral position is depressed. Besides, at a large load, the cab receives compressive repulsion power of oil thereby restricting its damping ability. In addition, it is difficult to obtain an arbitrary damping performance separately. To overcome these problems, which combines the shear force due to viscous fluid with elastic force due to air-spring a mount, was invented. The neutral position of composite mount is adjustable by air-spring according to the weight. And viscous oil is not sealed up. So, viscous oil can flow at a large load. Therefore, it may not experience the repulsion force of oil in spite of a large load. Moreover, the generated elastic force is adjustable according to change of pressure in the air spring, and the generated damping force is adjustable according to change of viscous fluid's viscosity or volume.

Operator comfort is an important design criteria for hydraulic excavators during working and idling conditions. An engine, a cooling fan motor and a pump are installed on a hydraulic excavator. It is hard to identify the vibration contribution to a response because three sources are synchronizingly working. This paper describes the use of partial coherence measurement techniques for source identification. And it is examined to reduce the vibration of the source component identified by the partial coherence results. Finally, it is verified that the response acceleration is effectively decreased by reducing the vibration of the identified component.