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 438 of 801

TM 9-2320-273-34

(7)

The hand-rolled pattern shown (gears unloaded), will result in a pattern centered in the

length of the tooth when the gears are under load, as shown (fig. 10-27) (gears unloaded). The loaded

pattern will be almost full length and the top of pattern will approach the top of the gear tooth.

(8)

The pattern on the coast side of teeth will appear the same width as the drive side;

however, the overall length will be centered between the toe and heel of gear tooth. After the

correct contacts, as shown, have been established with a backlash of 0.010 in. (0.254 mm), open the back-

lash to measure between 0.005-0.015 in. (0.127-0.381 mm), if required.

(9)

Set used gear to have the tooth contacts to match wear patterns. Hand-rolled patterns of

used gears will be smaller in area and should be at the toe end of wear patterns. Incorrect patterns are

shown in figure 10-28. A low contact indicates pinion is too deep. Set the pinion to the correct depth

by adding shims under the pinion cage. Slight inward movement of the hypoid gear may be necessary

to maintain correct backlash.

Figure 10-28. Incorrect Tooth Contact.

i.

Adjust the Drive Gear Thrust Screw.

(1)

Back out thrust screw (fig. 10-29) and jam nut.

(2)

Coat thrust end of screw with grease and reinstall screw and jam nut into carrier.

(3)

Tighten screw until it is firm against back face of hypoid drive gear.

10-30