You are performing a pre-operational check on an excavator. The hydraulic fluid reservoir sight gauge indicates the fluid level is significantly below the 'minimum' mark. What should be your next step?

Question: You are performing a pre-operational check on an excavator. The hydraulic fluid reservoir sight gauge indicates the fluid level is significantly below the 'minimum' mark. What should be your next step?

Answer options: ✅ Fill the hydraulic reservoir with the specified fluid to the 'full' mark, ensuring the engine is off.

• Start the engine, operate the hydraulics briefly, and then re-check the fluid level for accuracy.
• Top up the reservoir with any available hydraulic fluid to prevent cavitation.
• Continue with the circle-check, as a slightly low hydraulic fluid level is generally not critical.

Correct answer: Fill the hydraulic reservoir with the specified fluid to the 'full' mark, ensuring the engine is off.

Explanation: A significantly low hydraulic fluid level can lead to cavitation, overheating, and damage to hydraulic components. It's crucial to fill the reservoir with the correct fluid to the manufacturer's specified level with the engine off to get an accurate reading and prevent air from entering the system. Operating the hydraulics with a low level can exacerbate the problem, and using unapproved fluid can cause contamination and system failure.