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REFINISHING BRAKE DRUMS
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.    11 Sequence in Securing Brake Lining to Shoe
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BRAKES-HYDRAULIC To recondition a brake drum in a lathe (Fig.  7), the drum must be mounted so that it is centered.  Use proper size cone  to  provide  accurate  centering.    Turn  drum,  taking  only light cuts and remove just enough material to clean up drum. Then  grind  the  finished  surface  if  grinder  is  available  or  use emery cloth on a straight piece of wood and polish the drum friction surface. Fig.    7 Reconditioning Drum on Brake Drum Lathe Brake  drums  should  be  cleaned  thoroughly  with  a steam  cleaner  or  hot  water.    Do  not  use  a  solvent  which leaves an oily residue.  If inspection shows the drums may be used without remachining, rub friction surface with fine emery cloth  or  sandpaper  to  remove  any  foreign  deposits.    If  drum has been reconditioned, clean friction surface with fine emery cloth or sandpaper and wash.  Next examine very carefully to see that no metal chips remain in drum. INSPECTION OF SHOES Figure  8  Defects to be looked for on Brake Shoe When  brake  linings  or  blocks  are  worn  to  within  .8 mm   (1/32")   on   light   duty   vehicles   or   1.6   mm   (1/16")   on medium and heavy duty trucks of rivets, the brake shoes must be   removed   and   relined.      It   is   recommended   that   all   the brakes  be  relined  at  the  same  time  since  this  will  maintain balanced  braking  on  the  vehicle.    If  complete  replacement  is not desirable or necessary, be sure that all lining on one axle (both sides) is replaced at the same time. Examine   shoes   carefully   and   discard   those   which have any defects as shown in Fig.  8. REPLACING LINING ON SHOES When removing worn lining from shoes, drill out old rivets if possible to prevent distorting shoe table.  After the old linings  are  removed  from  the  shoes,  the  shoes  should  be cleaned and buffed to remove all dirt and grease.  Grease is one of the greatest deteriorating agents of lining. Discard   used   lock   washers   after   removing   lining bolts.  Use new washers when installing new lining.  Replace bolts and nuts if signs of distortion or wear are present. Do not handle new brake linings or relined shoes with greasy hands or allow linings to come in contact with mineral oil or grease. Care    should    be    used    in    selecting    the    correct thickness of lining for each brake shoe and drum.  Usually the standard thickness will be used.  If the drum has been turned or become worn, increasing the diameter, oversize lining may be required. Fig    9    Lining Selected too thin CTS-2779  Page 5 PRINTED IN UNITED STATES OF AMERICA

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