TM 5-3805-258-24-2POWER TRAINDISASSEMBLY AND ASSEMBLYb)c)d)FRONT AND REAR DIFFERENTIALSWith no load, correct tooth contact settingwill be as shown. The area of contact startsnear the toe of the gear and goes 3090 to 50% up the length of the tooth. With thissetting, when a load is put on the gear, theload will be over the correct area of theteeth.[f bevel pinion shaft is too far away frombevel gear, short toe contact will be theresult as shown. The teeth of pinion will bein contact with toe ends of convex faces(part that makes a curve toward the out-side), and top edge of heel end of concavefaces (part that makes a curve toward theinside). To correct this, remove shims frombetween pinion cage and carrier. After thisis done, check gear clearance (backlash)and tooth contact again.If bevel pinion shaft is too near to center ofbevel gear, short heel contact will be theresult as shown. The teeth of pinion will bein contact with toe ends of concave faces(part that makes a curve toward the inside)and the heel ends of convex faces (part thatmakes a curve toward the outside). To cor-rect this, add shims between pinion cageand carrier. After this is done, check gearclearance (backlash) and tooth contactagain.NOTE: Several adjustments of both pinion and bevelgear can be needed before correct tooth contact andgear clearance (backlash) is made. Always re-member that a change to gear clearance (backlash)will also change the tooth contact. Therefore, be suregear clearance (backlash) is in correct adjustmentbefore tooth contact is checked.e)f)After correct gear clearance (backlash)and tooth contact is correct, remove extraPrussian blue, red lead or paint from bevelgear and pinion.Install the O-ring seal between the pinion28.housing and carrier assembly. Remove theguide bolts and install the remainder of thebolts that hold the pinion housing in place.Tighten the bolts to a torque of 270 ± 25N-m (200 ± 20 lb. ft.).Install locks (31), the bolts and lockwire foreach adjustment nut. Remove the differentialand carrier assembly from tooling (A).end by:a) install front or rear differentialCORRECT TOOTHCONTACT SETTINGSHORT TOECONTACT SETTINGSHORT HEELCONTACT SETTING5-208
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