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Disassembly And Repair Of Gear Unit (cont) - TM-5-4210-220-34_344
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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 (cont)
TM 5-4210-220-34 3-7. TRANSMISSION-Continued (1) Visually inspect planetary carrier assembly for evidence of excessive wear, overheat indication,  damaged or heavy metal contamination. (2) Tools  required  for  rebuild  are  planetary  rebuilding  kit  J25587-01  and  a  ten  ton  hydraulic  press  with  an adjustable bed of 25 in. minimum opening.  The press must also have a pressure gage to correctly install the pinion pins. NOTE Do  not  disassemble  carrier  assembly  unless  parts  replacement  is  necessary.    Failure  of  one  pinion requires replacement of the entire pinion gear set because they are selectively matched. (3) Check end play of planetary carrier pinions.  With washer held flat, insert feeler gage between carrier and thrust washer.  End play must be within 0.008-0.031 in. (0.203-0.787 mm). (4) If planetary carrier requires overhaul, use a drill that is slightly smaller  than  the  pinion  pin  diameter,  drill into the swaged ends of the pins (only one end required).  Do not drill into the carrier.  The rear ends of all pinion  pins  except  those  in  the  center  carrier  assembly  will  be  drilled.    Drill  the  front  ends  of  the  center assembly pins. (5) Place press fixture J25587-1 in hydraulic press.  Select proper adaptors to perform removal or installation operations on planetary to be overhauled. (6) Refer to para. z.  for front planetary gear overhaul; para. aa. for center planetary gear overhaul; para. ab. for rear planetary gear overhaul and para. ac.  for low planetary gear overhaul. z. Front Planetary Gear Overhaul (1) Front   planetary   gear   overhaul   requires tools J25587-1 Fixture J25587-16 Pin Remover J25587-20 (six) Loading Pin J25587-49 (six) Guide Pin J25587-9 Pin Installer J25587-17 Swaging Tool Holder J25587-25 (two) Swaging Tool J25587-4 Support Block (2) Drill out planetary pins from rear side of carrier.  Place carrier assembly in fixture with  drilled  pins  up,  Install  pin  remover J25587-16 into fixture ram. (3) Press out six pins.  Remove and keep six groups separate. (4) Inspect carrier (6) for loose or worn bushing (7).  Replace housing carrier if damaged or worn excessively. (5) Install  loading  pin  J25587-20  in  each  pinion  (5).    Install  roller  bearing  (4)  on  pin,  then  steel  and  bronze thrust washers (2 and 3) on each end.  Lubricate needle bearings with transmission fluid (item 9, Appendix B) before installation of groups into carrier. 3-53

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