You are checking the coolant level in an excavator. The reservoir is integrated and appears opaque. The external indicator shows the level is at the 'minimum' mark. The engine is cold. What action should you take?

Question: You are checking the coolant level in an excavator. The reservoir is integrated and appears opaque. The external indicator shows the level is at the 'minimum' mark. The engine is cold. What action should you take?

Answer options: ✅ Add coolant up to the 'maximum' mark using the manufacturer-specified type.

• Run the engine for 5 minutes and then re-check the level.
• Top up with plain water to save time, then replace later with proper coolant.
• Document the level and proceed with operation, as it's not below minimum.

Correct answer: Add coolant up to the 'maximum' mark using the manufacturer-specified type.

Explanation: During a cold check, the coolant should be between the 'minimum' and 'maximum' marks. Adding the specified coolant to the 'maximum' mark ensures an adequate reserve for engine cooling and heat transfer, as per OPSWA guidelines. Using incorrect fluids or operating at minimum levels can lead to overheating.