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ESTABLISH NOMINAL DIMENSION
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SET GEAR LASH
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 lugs on step plate straddle the bearing staking indentations on end of pinion. Fig.  27  Installing Step Plate 4. Mount assembled SE-1065 gauge in bearing bores of carrier as shown in Fig.  28.  Make certain that bearing bores are clean and free of nicks and burrs.  Adjust micrometer so it is  directly  over  end  at  a  90  degree  angle  to  the  step  plate. Take micrometer reading.  Run the micrometer thimble down to  measure  the  distance  between  the  center  of  the  ring  gear and the step plate, or in the event of a spiral bevel type drive, measure the distance to the face of the pinion itself.  Make a note of this measurement. Fig.  28  Assembled Gauge in Position 5. Locate     pinion     nominal     dimension     (cone     center specification)  for  the  axle  to  be  adjusted.    On  some axles  this  dimension  may  be  shown  on  the  pinion. Where this is not the case, it will be listed in the rear axle specifications.  Write down this specification. 6. Also   locate   on   pinion   the   etched   marking   which indicates   a   variation   from   zero   cone   center.      If   a minus   figure,   subtract   from   specified   cone   center, and if a plus figure, add to specified cone center. NOTE The  plus  or  minus  variation  marked  on  the pinion will not necessarily show small variations  such  as  -5,  +3,  or  +7.    On  some pinions   the   variation   marking   will   range   to higher  figures  such  as  +56,  +59  or  perhaps higher. Results of calculation give the corrected cone center or pinion nominal dimension to which the pinion must be set. 7. Comparison   of   corrected   cone   center   (6)   with   the actual or measured cone center (4) indicates amount of change necessary for pinion position. 8. Remove  gauge  and  install  ring  gear  and  differential carrier in the differential housing. 9. Adjust backlash according to marking on ring gear. To further clarify the use of the SE1065 pinion setting gauge, the dimensions from the same type of axle as used in the  aforementioned  disassembly  will  be  used  as  an  example of the calculation involved. Data: Rear Axle Model-RA20 Rear Axle Code-14020 SE-1065-9 Adapter Disc-N (2) Pinion Nominal Dimension-2.9839 Pinion Marked-(-5) Procedure: (a)  Take micrometer reading with gauge .................... 2.6239 Add .400 for thickness of step plate ............................ +.4000 Equals - Measured Nominal Dimension....................... 3.0239 (b) Record Pinion Nominal Dimension from Specifications or stamped on pinion ................................ ...................... 2.9839 Subtract the Pinion Correction (-5) ................................ ................................ .............  -.0050 Equals - Corrected Nominal Dimension or distance pinion should measure from center of ring gear..................... 2.9789 (c)    Subtract    correct    Nominal    Dimension    (b)    from    actual measurement (a) Equals - Amount pinion must be moved in .................. 0.0450 CTS-2095S-CHAPTER I-Page 12 PRINTED IN UNITED STATES OF AMERICA

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