We have ACE make vertical fin fan radiator for our refrigeration unit. Thrice, its fan blades have broken and damaged the radiator also. We checked the pulley alignment, belts, bearing intactness, but didnt find any prob. 1st time was due to material failure of fan blade but next two failures have no apparent root cause. Fan RPM are 600, there are two plumber block bearings for main fan shaft, an idler bearing for belt adjustments and one driving pulley connected to Engines crankshaft.
Can anyone suggest, what could be the possibilities for these failures. Vibration data also doesn't seem to be abnormal.
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