Xerox Phaser 8400 Service Manual page 235

3.
At the same time, rotate the left and right idler gears until the wiper is all the way
to the bottom and the gears cannot be rotated further. Rotating the left and right
gears together ensures that the wiper stays parallel and does not pop out of the
belts.
Wiper assembly at bottom
of travel. Wiper not skewed.
Rotate left and right idler
gears to lower wiper.
4. Replace the left drive gear and the e-clip.
Service Manual
Wiper skewed when lowering.
s8400-196
6-3