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REMACHINING ROTORS
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.    22    Drum Bolt Alignment
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BRAKES-HYDRAULIC The  terms  micrometres,  micro-inch  or  surface  finish or   smoothness   are   different   from   runout   and   parallelism. These terms refer to degree of how smooth the flat surface is. However,  if  good,  sharp  tools  and  proper  cutting  feed  and speed  are  used  when  remachining  the  rotor,  you  should  be within the .381-2.032 micrometres (15-80 micro-inch) tolerances. INSPECTION OF PADS The  disc  brake  pads  or  shoes  can  be  inspected  for wear on the vehicle.  It is normal for the inboard lining to show more wear than the out board lining.  Always install new pads assemblies in complete axle sets at both wheels on an axle. Since   lining   on   disc   brakes   will   be   bonded   (code 04135)   and   riveted   (codes   04138,   04139   &   04140)   the useable thicknesses will be different. Pads   with   bonded   lining   (code   04135)   must   be replaced when lining is worn to .7937 mm (1/32 in.) or less. Pads   with   riveted   lining   (codes   04138,   04139   & 04140)   must   be   replaced   when   lining   is   worn   to   3.1750- 4.7625 mm (1/8 to 3/16 in.) or less. It  is  suggested  that  the  pads  be  replaced  whenever they  are  removed  for  an  inspection  or  for  any  other  service and  they  are  found  to  be  worn  to  2.778  mm  (7/64  in.)  from shoe  surface  with  bonded  material,  or  from  rivet  heads  to brake lining surface. DRUM REPLACEMENT Different  assembly  methods  are  used  to  hold  brake drums   in   their   piloted   position   on   hub   while   wheels   are dismounted. LIGHT DUTY VEHICLES Drums  which  are  mounted  against  wheel  flange  on light duty vehicles are secured to studs either with speed nut fasteners   or   by   swagging   the   piloting   shoulder   of   stud   to drum.  To replace an original drum proceed as follows: Where threaded fasteners (Fig.  20) are used simply unthread speed nuts and lift drum from flange. Fig.    20 Threaded Fastener Type Drum Mounting If  swaged stud mounting (Fig.  21) is used, chuck a stud cutter in an electric drill, align cutter over each stud and cut away the swaged material.  Separate drum from hub and discard drum. Fig.    21 Swaged Stud Type Drum Mounting MEDIUM AND HEAVY DUTY VEHICLES Drum    replacement    on    medium    and    heavy    duty vehicles requires the removal of nuts from bolts securing hub and    drum    together.        The    hub    and    drum    can    then    be separated. MOUNTING NEW DRUM TO HUB Clean exposed hub or axle mounting flange with wire brush  or  coarse  file.    Use  straight  edge  across  surface  of flange to make sure it is not bent.  Remove excess paint from edge of drum hub hole and wash rust preventive sealer from drum with solvent. CTS-2779  Page 9 PRINTED IN UNITED STATES OF AMERICA

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