TM-9-2320-273-34

TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

DECEMBER 1980

TM-9-2320-273-34 - Page 437 of 801

TM 9-2320-273-34

h. Check Tooth Contact (fig. 10-27).

Figure 10-27. Satisfactory Hypoid Tooth Contact.

(1)

Apply a red lead compound (item 26, App B) lightly to the 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.

(2)

Sharper hand roll 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 making 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,

(3)

After obtaining a satisfactory tooth contact, the backlash can be altered within the limits

of 0.005-0.015 in. (0.127-0.381 mm).

(4)

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.

(5)

After correct tooth contact has been established, install adjusting nut cotter pins.

(6)

With adjustments properly made (pinion at correct depth and backlash set at 0.010 in.

(0.254 mm) the contacts in figure 10-27 will be procured. The area of contact favors the toe and is

centered between the top and bottom of the tooth.

10-29