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Disassembly And Repair Of Gear Unit (cont) - TM-5-4210-220-34_343
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Front Planetary Gear Overhaul
TM 5-4210-220-34 3-7. TRANSMISSION-Continued (17) Using   tool   J28489,   clamp   the   holding fixture   in   a   vise.      Place   the   sun   gear shaft   assembly   in   the   holding   fixture, and   put   the   reamer   and   pilot   tool   in place. When  machining  any  bushing,  keep  reamer  at full  drill  speed  when  pulling  it  back  through  the bushing.        If    reamer    is    not    rotating    during retrieval,    it    could    damage    the    bushing    and cutting tool. (18) Using a 1/2 in. electric drill, machine the small  OD  shaft  bushing  (approximately 75   to   150   rpm)   while   adding   cutting lubricant  (item  8,  Appendix  B)  through the holes in the pilot tool.  If a proper drill speed cannot be obtained with a standard    drill,    use    a    variable    speed control to reduce its rpm. (19) To machine the large OD shaft bushing, clamp the pilot tool in a vise.  Insert the bushing  pilot  tool  J28489-4  into  the  sun gear   shaft   (end   with   newly   machined bushing)  and  fasten  them  together  with the   locking   pin   J28489-6.      Using   the same  electric  drill,  engage  the  shaft  of the reamer in the pilot tool, and machine the bushing.  Add cutting lubricant (item 8, Appendix B) during machining operation.          Refer     to     the     preceding caution when retrieving the reamer from the bushing. (20) Check ID of bushings for runout. Runout must not exceed 0.002 in. (0.05 mm)   total   indicator   reading.      Surface finish   should   be   30   microinch   (0.762 micrometer). (21) Thoroughly    clean    shaft    of    chips    and debris. (22) If orifice plug was removed from shaft, use installer J24369 to properly position replacement orifice plug below chamfer in shaft. y. Planetary Carrier Assemblies Inspection And Repair NOTE The  disassembly  and  assembly  procedures  for  all  planetary  carrier  assemblies  differ  only  in  the  proper tool selection for the specific application and identifies the carrier involved (front, center, rear, low). 3-52

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