Which combination of fluids is typically checked during a pre-operation inspection?

• A. Engine oil, hydraulic oil, coolant, fuel level, transmission oil, and separator fluids.
• B. Engine and brake fluids only.
• C. Transmission oil and power steering fluid.
• D. Coolant and windshield washer fluid.

Answer: (A)

During a pre-operation check, you verify all critical fluid levels to prevent immediate equipment failures and safety issues. The most complete set to inspect includes engine oil, hydraulic oil, coolant, fuel level, transmission oil, and separator fluids. Each fluid supports a vital function: engine oil lubricates internal components, hydraulic oil powers and protects the hydraulic system, coolant prevents overheating, fuel level ensures continuous operation, transmission oil lubricates gears and assists shifts, and separator fluids (where present) keep related systems functioning properly. Checking all of these helps catch leaks, contamination, or low levels before you start work.

The other options miss several of these essential fluids, focusing on only a subset and leaving gaps that could lead to damage or unsafe operation.