WHEEL GP-FINAL DRIVE & BRAKE 4E6091 - Caterpillar

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Illustration 1 g01111664
(1) Check valve (2) Bypass valveThe fuel transfer pump is located on the right side of the engine. The lower shaft of the engine oil pump drives the gear type transfer pump. Fuel from the supply tank is pulled through the primary fuel filter by the fuel transfer pump. The fuel is sent to the fuel filter housing.The fuel transfer pump has a check valve (1) and a bypass valve (2). The check valve (1) is located in the pump head assembly. The check valve prevents fuel flow back through the transfer pump when the fuel priming pump is used. The bypass valve (2) is located behind a cap (plug) in the drive end of the pump. The bypass valve limits the maximum pressure of the fuel. The bypass valve will open the outlet side of the pump to the pump inlet if the fuel pressure exceeds 860 kPa (125 psi). This process helps prevent damage to the fuel system components from too much pressure.