Install the Packing is not valid.Cage Seal is installed in a location that is not valid in the Stuffing Box. The water inflow to the silicone is unable to act.The shaft of the pump, and so are not mutual Center.The shaft or casing the shaft (Shaft sleeves) damaged.Silicone is not suitable for the kind of working conditions.Shaft rotation does not work because of the slippery shaft up and pump damaged or are not zero.Propeller or other rotating parts, unbalanced Cause shivering.Lubricating gland (Gland) are too tight, as a result, there is no lubrication flow into each other leaked (Packing)There is no water flow to the cooling compressor leak proof cartridges (Stuffing Box) water-cooled type.The gap (Clearance) between the axle with the household pumps (Casing) at the bottom of the compressor is too much silicone cartridges. Make the silicone has been pushed into the pump room.There is dirt or gravel or sand in liquid silicone (Sealing Liquid), causing scratches on the axle or axles casing.
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