What method should be used to check the hydraulic fluid level?

Using a dipstick or sight gauge is the recommended method for checking the hydraulic fluid level because it provides a direct and accurate reading of the fluid's volume. A dipstick or sight gauge is specifically designed for the purpose of measuring fluid levels in hydraulic systems and usually includes markings that indicate the minimum and maximum levels, allowing operators to assess whether the fluid is within the acceptable range.

This method ensures that any potential issues, such as low fluid levels that could adversely affect the performance of the aerial apparatus, can be identified promptly. It is a straightforward, reliable means to ascertain the hydraulic fluid level without guessing or relying on indirect assessments.

Other methods, such as visual inspection, might not provide precise information about the fluid level, while automatic sensors may not always be present or functioning correctly. Fluid sample tests, although useful for assessing fluid quality, do not indicate the current level of hydraulic fluid in the system. Thus, using a dipstick or sight gauge remains the most effective and practical approach for regular checks.