If the drive belts on an air compressor were squealing during startup, you should __________.

Correct Answer: Option C — check the operation of the unloaders

Squealing belts during startup indicate slippage caused by excessive load. If the compressor starts against full receiver pressure, the motor struggles to reach operating speed. Proper unloader operation ensures the compressor starts in an unloaded condition, significantly reducing the starting torque required and preventing belt slippage and premature wear.