Adjusting the maximum temperature limit on a Delta Monitor shower valve involves modifying the plastic temperature limit stop ring located directly behind the outer handle assembly. First, turn off the water, 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 accidental scalding, or counter-clockwise to allow hotter water, then secure it back into position.
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