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INSTALLATION - TM-5-4210-229-14P_292
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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AIR LINES AND PIPING REPLACEMENT
TM5-4210-229-14&P 4-170. BRAKE DRUM MAINTENANCE (Continued). REMOVAL a. Remove eight nuts (1), grease cap (2) and gasket (3). b. Remove   two   bearing   adjustment   nuts   (4)   along with washer (5). c. Tap  on  cast  wheel  hub  (6)  using  a  rubber  mallet until wheel works loose and outer cone bearing (7) and  bearing  outer  cap  (8)  can  be  slid  off  spindle (9). d. Remove wheel hub (6) and drum (10). SERVICE NOTE The brake drum is removed with the hub.  Brake drums that are otherwise in good condition can be  turned  in  a  lathe.    However,  it  must  be  re- membered  that  the  recommended  remachining or  rebore  limit  for  brake  drums  with  a  diameter over  14  inches  (355  mm)  may  not  be  increased more  than  .080  inch  (2.03  mm)  diameter  (total cut)  and  discarded  at  .120  inch  (3.05  mm)  over normal diameter. The dimension located on the drum is discarded dimension.  Never remachine drums to maximum wear or discard diameter. To recondition a brake drum in a lathe, the drum must be remounted so that it is centered. d.  Grind the finished surface if grinder is available or use emery  cloth  (Appendix  D,  Item  13)  on  a  straight  piece  of wood and polish the drum friction surface. e.  Brake drums should be cleaned thoroughly with a steam cleaner or hot water. INSTALLATION a.  Pack bearing (7) with grease (Appendix D, Item 20). b.  Carefully slide drum (10) and hub (6) onto spindle (9). c.  Slide bearing outer cap (8) and bringing outer cone (7) onto spindle and push into position in wheel hub (6). d. Install one bearing adjusting nut (4) and tighten by hand, rotate    wheel    hub    (6)    and    take    up    slack    by    torquing adjusting nut (4) to 50 ft-lb (67.8 N.m). e.  Back off nut approximately one quarter to one-third turn and install washer (5) and second nut (4). a. Install brake drum on lathe. b. Use proper size cone to provide accurate centering. c. Turn drum, taking only light cuts and remove just enough material to clean up drum. f.    While securely holding inner nut (4) with a wrench, torque outer nut (4) with another wrench to 150 ft-lb (203 N.m). Check for free movement. g.  Install gasket (3) and grease cap (2) with eight nuts (1) and torque nuts to 15 ft-lb (20.1 N.m). h.  Install tire rim assembly (paragraph 4-162). 4-187

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