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INITIAL LUBRICATION OF WHEEL BEARINGS
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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REFINISHING BRAKE DRUM
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 WHEELS, RIMS, TIRES CHAPTER II BRAKE DRUMS INSPECTION The  friction  surface  of  brake  drums  must  be  smooth, true and concentric whether for air or hydraulic brakes. Make certain with a visual check that drums are not barrel shaped, bellmouthed, scored or eccentric.  A barrel shaped drum (Fig. 1) results from overheating. If this barrel shaped condition is not   corrected,   the   braking   surface   is   reduced   and   uneven lining wear results. Fig.  1 Extreme   pressure   which   over   a   period   of   time   will create a bellmouthed drum is shown in Fig.  2.  Brake linings on  a  bellmouthed  brake  drum  will  make  contact  only  on  the inner  surface  of  the  drum.  In  addition  to  cutting  the  braking surface  to  a  minimum,  it  will  also  cause  uneven  and  rapid wear. Fig.  2 Scored drums are the result of worn linings to the point where  the  drum-to-shoe  contact  is  made  or  an  accumulation of  small  steel  particles  imbed  themselves  in  the  brake  lining (Fig.    3).    The  steel  particles  form  a  tough  scale  which  is sometimes  harder  than  the  drum.    As  a  result  deep  grooves are formed in friction surface of drum. Brake   drum   scoring   never   improves   but   continually gets   worse   until   both   lining   and   brake   drum   are   useless. Attempting to reline brakes without turning scored Fig.  3 brake drum surface will quickly destroy new lining and make effective braking impossible. Brake   lining   in   an   eccentric   or   out   of-round   drum cannot  make  full  contact  with  the  drum  resulting  in  rapid  or uneven  lining  wear  and  could  even  cause  brakes  to  seize  or chatter.      Maximum   allowable   out-of-round   or   eccentricity should be .10 mm (.004"). If inspection shows that any of the preceding conditions exist,  brake  drum  should  be  either  turned  or  replaced.    To assure  a  balanced  braking  system,  always  install  turned-or new brake drums in pairs on each axle. Any  time  a  new  brake  drum  is  to  be  installed  on  a vehicle,  the  runout  should  be  checked  as  follows.    Place  the new   brake   drum   with   hub   and   wheel   assembled   in   lathe making  certain  drum  is  centered.  Mount  Dial  Indicator  SE- 1848 on lathe and check runout about 12.7 mm (.5") in from end of drum as shown in Fig.  4.  Runout must not exceed .38 mm (.015"). NOTE:      Before   assembling   drum,   hub   and wheel,   all   parts   must   be   clean   and   free   of foreign matter. If  runout  exceeds  .38  mm  (.015")  remove  drum  from hub,  rotate  drum  180°   and  reinstall  on  hub.    Check  runout again;  if  runout  still  exceeds  .38mm  (.015"),  remove  drum from hub and rotate drum 1/4 turn. Reinstall drum on hub and recheck runout. REFINISHING BRAKE DRUM On  brake  drums  manufactured'  after  January  1,  1971, the   maximum   diameter   to   which   drum   can   be   worn   is stamped or cast into drum.  Drum should be discarded if worn beyond   this   limit.      Minor   scores   on   brake   drum   can   be removed with fine emery cloth or steel wool, but always clean CTS-2032N  Page 1 PRINTED IN UNITED STATES OF AMERICA

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