This multi-ribbed belt drives the engine cooling fan, which pulls air through the radiator core to maintain operating temperature. It runs on the crankshaft pulley and the fan hub pulley, transmitting torque through multiple V-ribs that engage the pulley grooves. A slipping or worn belt reduces fan speed, causing coolant temperature to rise under load and potentially triggering an overheat alarm. The belt is manufactured to the original profile dimensions, matching the pulley groove pitch and depth so that tension remains within the specified range without requiring shims or adapters. On replacement, inspect the tensioner and idler pulleys for bearing wear, and adjust the belt tension to the value given in the service manual for the host tractor.