Why is it critical to check the hydraulic oil level with the excavator boom and bucket in a specific position?

It is critical to check the hydraulic oil level with the excavator boom and bucket in a specific position, typically fully retracted and resting on the ground, to ensure an accurate and consistent oil level reading. The hydraulic system in an excavator is a closed-loop system, and the hydraulic cylinders (boom, arm, and bucket) hold a significant volume of hydraulic oil. When the cylinders are extended, a large portion of the oil is contained within the cylinders themselves and the associated hoses and lines. When the cy....