TM 5-3825-226-24DIFFERENTIAL AND CARRIER ASSEMBLY (LOCK TYPE)28.To make an adjustment of the differential bearingpreload and gear clearance (backlash) between thebevel gear and pinion use the following procedure:a)Tighten the adjustment nuts until there is asmall amount of preload on the bearings.b)Install tool group (C) on the bevel gear asshown to check the gear clearance(backlash) at four locations around the bevelgear 90° apart. Use the lowest indication ontool group (C) as the correct gear clearance(backlash) value. The correct gear clearance(backlash) is .010 + .004 or-.003 in. (0.25 +0.10 or -0.08 mm).c)If the gear clearance (backlash) is too much,loosen the upper adjustment nut and tightenthe lower adjustment nut the same amount tochange to gear clearance (backlash) If thegear clearance (backlash) is not enough,loosen the lower adjustment nut and tightenthe upper adjustment nut the same amountto change the gear clearance (backlash).d)Tighten the upper adjustment nut until atorque of 30 to 50 lb. in. (3.4 to 5.7 N•m) isneeded to turn the pinion shaft.e)Check the gear clearance (backlash) againas in Steps b and c.29.To check the tooth contact setting between thebevel gear and pinion after the gear clearance(backlash) and the bearing preload adjustmentshave been made, use the following procedure:a)Put small amount of prussian blue, red leador paint on bevel gear teeth. Turn pinion andcheck marks made on bevel gear teeth.b)With no load, correct tooth contact settingwill be as shown. The area of contact startsnear toe of gear and goes about 30% up thelength of tooth. With this setting when loadis put on gear, it will be over the correct areaof teeth.c)If bevel pinion shaft is too far away frombevel gear, short toe contact will result asshown. The teeth of pinion will be in contactwith toe ends of convex faces (part thatmakes a curve toward the outside), and topedge of heel end of concave faces (part thatmakes a curve toward the inside). To correctthis, move pinion shaft toward gear by adecrease of shim thickness between pinioncage and carrier. After this is done, checkgear clearance (backlash) and tooth contactagain.3-242
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