Technician A says that the best way to inspect drive belts made with EPDM is the three cracks in a three inch replacement rule. Technician B says that drive belts made with EPDM do not crack when they stretch and wear out. Who is correct?

Question

Quizplus · Accepted Answer

Technician B is correct because EPDM (Ethylene Propylene Diene Monomer) belts do not show the traditional signs of wear like cracking. Instead, they wear down and may lose material without the visible cracking that was common with older belt materials. The "three cracks in a three-inch rule" does not apply to EPDM belts.

Technician a Says That the Best Way to Inspect Drive