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Cast iron, springs, you know. Do any of you guys change these as a matter of preventive maintenance? One just let go on a customer and it destroyed the bearing assy. What is YOUR method or procedure when you reassemble them? Motor first or pump side first? What causes them to fail? The pump bearings feel ok, I can spin the shaft, no water leaking into them but once I replaced the coupling and ran it up the bearings started to howl something awful. The bearings have been getting a few drops of oil every 4 months.