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Ring Gear And Pinion Tooth Contact Adjustment
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Pinion Bearing Preload - Final Test And Adjustment
TM 5-4210-220-34 2-21. FRONT AXLE - Continued (3) If necessary, adjust the contact pattern by moving the ring gear and drive pinion.  Ring gear position controls the backlash.  This adjustment moves the contact pattern along the face width of the gear tooth.  Pinion position is determined by the size of the pinion bearing cage shim pack.  It controls contact on the tooth depth of the gear tooth. These adjustments are interrelated.  As a result,  they must be considered together even though the pattern is altered by two distinct operations.  When making adjustments, first adjust the pinion,  then the backlash.  Continue this sequence until the pattern is satisfactory. (4) If the gear pattern shows incorrect tooth depth contact, change drive pinion position by altering the shim pack.  Used gears should achieve proper contact with the same shims removed from the axle during disassembly. (5) If the pattern Is too close to the top land of the gear tooth, remove pinion shims. (6) If the pattern is too close to the root of the gear tooth, add pinion shims. NOTE Check ring gear backlash after each shim change and readjust as necessary to maintain 0.006 0.016 in. (0.16 0.41 mm). (7) If the gear pattern shows incorrect face width contact, change backlash. (8) With the pattern concentrated at the toe (too far down the tooth), add backlash, see a.  preceding. (9) If the pattern is concentrated at the heel (to far up the tooth), remove backlash see a.  preceding. c. Pinion Bearing Preload Adjustment Preliminary (1) Assemble pinion bearing cage, bearings and spacer (without drive pinion or oil seal). Center bearing spacer between two bearing cones. NOTE When  new  gear  set  or  pinion  bearings are   used,   select   nominal   size   spacer from   the   specification   chart   below.      If original    parts    are    used,    use    spacer removed during disassembly. (2) With the bearings well lubricated, place the assembly in a press.  Position sleeve so that load is applied directly to the backface of the outer bearing cone. 2-299

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