TM 5-3810-300-24 & P2
CHECK TOOTH CONTACT.
Apply oiled red lead lightly to the hypoid gear teeth.
When the pinion is rotated, the red lead is squeezed
away by the contact of the teeth, leaving bare areas the
exact size, shape and location of the contacts.
Sharper impressions may be obtained by applying a small amount of resistance to the gear with a flat steel bar and' using
a wrench to rotate the pinion. When adjustments, check the drive side of the gear teeth. Coast side should be
automatically correct when drive side is correct. As a rule, coating about twelve teeth is sufficient for checking purposes.
After obtaining a satisfactory tooth contact, especially in relation to the top and bottom of the tooth, the backlash can be
altered within the limits of .005"-.015" to obtain a better contact position relative to the length of the tooth.
A high backlash setting can be used to keep the contact from starting too close to the toe, and a low backlash setting can
be used to keep the contact from starting too far away from the toe.
After correct tooth contact has been established, install adjusting nuts locks and cap screws. Tighten cap screws and
lock wire to bearing capscrews.
CORRECT TOOTH CONTACT ASSURES LONGER GEAR LIFE.
With adjustments properly made (pinion at correct depth
and ,backlash set at .010") the above contacts will be
procured. The area of contact favors the toe and is
centered between the top and bottom of the tooth.
SATISFACTORY TOOTH CONTACT