Which LO component is hydraulically operated?

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Multiple Choice

Which LO component is hydraulically operated?

Explanation:
The main idea is recognizing which part of the lubrication oil (LO) system is controlled by hydraulic pressure. An unloader is designed to be actuated by hydraulics, moving a valve to bypass or reduce flow in the LO circuit as needed. This makes it hydraulically operated. In contrast, a strainer is just a passive filter, a cooler is a passive heat exchanger, and a reservoir is simply a storage tank—none of these require hydraulic actuation to perform their normal function. So, the LO unloader is the hydraulically operated component.

The main idea is recognizing which part of the lubrication oil (LO) system is controlled by hydraulic pressure. An unloader is designed to be actuated by hydraulics, moving a valve to bypass or reduce flow in the LO circuit as needed. This makes it hydraulically operated. In contrast, a strainer is just a passive filter, a cooler is a passive heat exchanger, and a reservoir is simply a storage tank—none of these require hydraulic actuation to perform their normal function. So, the LO unloader is the hydraulically operated component.

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