1W4402 Gear Camshaft Fits Caterpillar ModelsOne New Aftermarket Replacement Camshaft Gear for Caterpillar (Cat) Equipment This aftermarket replacement camshaft gear fits Caterpillar engines and is part of the engine timing gear train located at the front of the cylinder block. The camshaft gear works in conjunction with the crankshaft gear and fuel injection pump drive gears to keep valve and injection timing synchronized. The Cat OEM part number for this gear is 1W 4402, and it is an 80 tooth