Exterior Parts & Accessories. Interior Parts & Accessories. Heavy Equipment Parts & Access. Engines & Engine Parts. Hydraulic Pump Adapter 3936136 3936138 for Cummins 6B5.9 6BT5.9 4B3.9 Engine. Compatible with Cummins 6B5.9 6BT5.9 4B3.9 Diesel Engine. Please double check that this product fits your car before purchasing check your part number, photo. Since the effect of light is different between the display and the display, the actual color may be different from the color of the image. Communication is very, very important for us to do business online.