2w4087 Gear A Fits Caterpillar Models

2W4087, 2W-4087. The idler gear is a critical component of the engine lubrication system, transmitting drive between the oil pump and the engine gear train to maintain consistent oil pressure. Caterpillar Engines - Machine and Generator Set: 3412, 3412C, 3412D, D9L, D10N, D10R, D10T, D10T2, D11R, D11T.