TM 9-2320-209-20-3-1 c. Replacement and Adjustment. NOTE Fan drive belts (1) must always be replaced as a pair. 1. Place two fan drive belts (1) over coolant pump pulley (2), crankshaft pulley (3), and generator pulley (4). 2. Hand tighten capscrew (5) with washer (6). GO TO FRAME 2 TA 047638 6-46