DANA Spicer Torque-Hub W3B Series, Service Manual

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5
Planetary Final Drive Service Manual
Roll and Leak Test
Torque-Hub
®
units should always be roll and leak tested before
disassembly (if possible) and after assembly to make sure the unit’s
gears, bearings, and seals are working properly. The following
information briefly outlines what to look for when performing these
tests.
The Roll Test
The purpose of the roll test is to determine if the unit’s gears are
rotating consistently, easily and properly. Release the brake by
applying 400 Psi to the brake port. To perform a roll test, use the
recommended tool from table below (or something equivalent) to
apply constant rotational force to the input of the gearbox. If more
drag is felt in the gears only at certain points, then the gears are not
rolling consistently and easily and should be examined for improper
installation or defects. Some gear packages roll with more difficulty
than others. Do not be concerned if the gears in the unit seem to roll
hard as long as they roll with
consistency . Rotate the gearbox both
clockwise and counterclockwise the same number of turns as the
ratio of the unit. The gearbox ratio is the same number as the last
three numbers on the ID tag.
Model code Roll Test Tool
W3xxxx3xxxx T223988
W3xxxx4xxxx T223989
W3xxxx7xxxx T223990
W3Bxxx8xxxx T223997
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