Mitsubishi FG15N Service Manual page 20

COOLING SYSTEM
Installation
To install, follow the removal sequence in reverse. Also
follow the instructions given below.
(1) Before installing the belt, turn the fan to check for
smooth rotation. Replace the bearing if it generates
abnormal sound.
(2) After installing the belt, push it to make sure that the
tension pulley moves, then tighten the pulley lock bolt
firmly.
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