Adjusting the maximum temperature limit on a Delta shower faucet involves modifying the plastic temperature limit stop ring located directly behind the outer handle assembly. First, turn off the water supply, remove the handle set screw, and pull off the decorative sleeve. Locate the adjustable plastic gear insert on the stem, pull it outward slightly, and rotate it clockwise to restrict hot water mixing and prevent scalding, or counter-clockwise to allow hotter water, then secure it back into position.
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