A dishwasher spray arm repeatedly falling off usually indicates a worn-out, cracked, or stripped plastic retaining clip, mounting nut, or central hub. Over months and years of heavy washing cycles, constant water pressure changes, and thermal expansion from hot water, plastic mounting components degrade, snap, or lose their grip. In regions with hard water, heavy mineral scale and calcium deposits can also build up inside the threading and weaken the locking mechanism. Inspect the mounting clip closely; if the plastic tabs or threads are broken, you must order an exact manufacturer-approved replacement part to secure it properly.
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