Check the distribution spray nozzles to ensure even distribution over the fill.

Check the distribution basin for corrosion, leaks, and sediment.

Operate flow control valves through their range of travel and re-set for even water flow through the fill.

Remove any sludge from the collection basin and check for corrosion that could develop into leaks.

Check the drift eliminators, air intake louvers, and fill for scale build-up. Clean as needed.

Look for damaged or out-of-place fill elements.

Inspect motor supports, fan blades, and other mechanical parts for excessive wear or cracks.

Lubricate bearings and bushings. Check the level of oil in the gear box. Add oil as needed.

Adjust belts and pulleys.

Make sure there is proper clearance between the fan blades and the shroud.

Check for excessive vertical or rotational free play in the gear box output shaft to the fan