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ADJUSTMENT
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Ring Gear And Pinion Tooth Contact Adjustment (cont)
TM 5-4210-220-34 2-21. FRONT AXLE - Continued 2-21.2 Differential Carrier - Continued (3) At teeth side of ring gear, tighten adjustor until it contacts the bearing cup.  Continue tightening adjustor two or three notches and this will preload bearings and provide backlash. (4) Measure    backlash    with    a    dial    indicator. Used Gear Ring Reset to backlash recorded  before  disassembly.    New  Gear Ring  Backlash  should  be  0.006  0.016  in. (0.15  0.41  mm).    If  backlash  is  incorrect, proceed as described below to readjust. (5) To add backlash: Loosen the adjustor on the teeth side of the ring gear several notches.  Loosen the opposite adjustor one notch.  See illustration for definition.  Return to adjustor on teeth side of the ring gear and tighten adjustor until it contacts the bearing cup.  Continue tightening the same adjustor 2 or 3 notches.  Recheck backlash. (6) To remove backlash: Loosen the adjustor on the teeth side of the ring gear several notches.  Tighten the opposite adjustor one notch.  Return to adjustor on teeth side of ring gear and tighten adjustor  until  it contacts  the  bearing  cup.  Continue tightening the same adjustor 2 or 3 notches.  Recheck backlash. b. Ring Gear And Pinion Tooth Contact Adjustment (1) Check tooth contact pattern (new gear). Paint twelve ring gear teeth with marking compound and roll the gear to obtain a contact pattern.  The correct pattern is well- centered on the ring gear tooth within lengthwise contact clear of the toe.  The length of the pattern in an unloaded condition is approximately one-half to two- thirds of the ring gear tooth.  If adjustment Is necessary proceed to step 3. (2) Check tooth contact pattern (used gear). Used gearing will not usually display the square, even contact pattern found in new gear sets.  The gear will normally have a "pocket" at the toe-end of the gear tooth which tails into a contact line along the root of tooth.  The more use a gear has had, the more the line becomes the dominant characteristic of the pattern.  Adjust used gear sets to display the same contact pattern observed before disassembly.  A correct pattern is clear of the toe and centers evenly along the face width between the top land and root.  Otherwise, the length and shape of the pattern are highly variable and is considered acceptable as long as it does not run off the tooth at any point. 2-298

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