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This high quality alloy casting 4JG1/4JG2 crankshaft is suitable for forklift truck, Hitachi excavator, Kobelco excavator, and Sany excavators.Inferior quality 4JG1/4JG2 often have a poor finishing. Some fail to rotate properly or leak oil due to casting flaw. Forging steel ones are also available on the market. But they haven't undergone heat treatment. Dimensions vary within the same batch. It costs more while its overall performance is not as stable as our casting one.