This V-belt transmits power from the engine drive system to the compressor pulley on the host harvester. It sits in the drive loop between the crankshaft or auxiliary drive and the compressor input, maintaining tension to prevent slip under variable load. A worn or glazed belt causes reduced compressor speed, leading to lower system air pressure and slower engagement of pneumatic actuators. This original-manufacturer belt is molded to the same cross-section profile as the original assembly, so it seats correctly in the pulley grooves without requiring shimming or adapters. On installation, verify belt tension against the manufacturer's specification and replace any idler pulleys that show bearing wear.