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Drive Pinion, Oil Seal, and Yoke Repair (cont) - TM-5-4210-220-34_287
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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
TM 5-4210-220-34 2-21. FRONT AXLE - Continued NOTE Carry out step 3 even if bearing (48) only needs replacement. (3) Remove bearing cone (48), spacer (47), and gear (46) in one operation using a suitable puller as shown. (4) Install gear (46) on pinion (26).  Be sure recessed hub is facing out as shown. (5) Install spacer (47) and bearing (48).  Use a hammer and a suitable sleeve to seat bearing. (6) Install castle nut (49) and tighten to 840 ft lb (1140 Nm).  Continue to tighten nut further until a roll pin hole in pinion alines with a slot in castle nut. (7) Install roll pin (51). (8) Proceed with installation of power divider as detailed in para.  2-20.1. ADJUSTMENT NOTE Bearing  preload  adjustment  Is  performed  for  both  pinion  and  differential  bearings.    It  maintains  proper gear  alinement  by  creating  correct  bearing  cone  and  cup  relationship  for  free  rotation  under  load.    The pinion pilot bearing does not require a preload adjustment. Ring  gear  tooth  contact  adjustment  positions  ring  gear  and  pinion  for  best  contact  under  load  Correct adjustment distributes torque evenly over gear teeth and helps maximize gear set life. a. Differential Bearing Preload And Ring Gear Backlash Adjustment (1) Loosen  the  bearing  adjustor  on  the  same side  as,    the  ring  gear  teeth  until  its  first thread is visible. (2) Tighten the bearing adjustor on the backface side of the ring gear until there is no backlash.  This  can  be  tested  by  facing the   ring   gear   away   from   the   body   while gently  rocking  the  gear  from  side  to  side. There should be no free movement.  Rotate the ring gear and check for any point where the  gear  may  bind.    If  such  a  point  exists, loosen and retighten the back side adjustor. Make all further adjustments from the point of tightest mesh. 2-297

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