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DESCRIPTION - TM-5-4210-230-14P-1_400
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LINING CLEARANCE ADJUSTMENT
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 IMPORTANT Contact   plug   must   be   replaced   when   new lining    is    installed.        Do    not    use    oversize thickness    lining,    even    though    drums    are rebored. Do not lubricate adjuster mechanism. If  new  lining  has  no  contact  plug  hole,  cut  a  19.05  mm (3/4") hole and deburr the edges. Locate this hole by making a proper template of the shoe table. WHEEL CYLINDERS Inspect   wheel   cylinders   for   signs   of   fluid   leakage   or deteriorated rubber dust boots.  If brake fluid is leaking out of wheel cylinders, replace or recondition wheel cylinders. Some brake groups have wheel cylinder piston stops and the wheel cylinder must be removed for reconditioning. RETRACTING SPRINGS AND SELF-ADJUSTING MECHANISM COMPONENTS Inspect   retracting   spring   for   distortion   such   as   nicks, twisted  shanks  or  spread  of  coils.  Damaged  spring  must  be replaced. Inspect self-adjusting mechanism components for damage    or    wear,    any    piece    of    which    the    condition    is considered questionable must be replaced. REINSTALL BRAKE SHOES 1. Position wedge guide in shoe web hole on side away from brake backing plate, with serrations facing away from shoe table.  Lay wedge with serrations matched against guide and slot aligned over the lever pivot pin hole shoe web (Fig.  4). Fig.  4 2. Insert  contact  plug  into  the  web  recess  and  guide  it into  the  shoe  table  with  plug  shank  over  the  wedge guide and wedge.  Insert adjuster lever pins through shoe from the opposite side and mate the actuating (center) pin with the plug shank hole (Fig.  5). 3. Assemble wedge washer over shoulder of pivot pin. 4. Slide  U-hook  of  tension  spring  on  pin  over  contact plug shank. Fig.  5 5. Hook one end of wedge (coil) spring on the U-hook, then  install  coil  of  torsion  spring  over  the  pivot  pin and  pull  free  spring  hook  over  the  edge  of  the  shoe web.    Hook  free  end  of  wedge  spring  over  finger  on wedge (Fig.  6). Fig.  6 6. Press  lightly  upon  contact  plug  to  allow  wedge  to move  and  fully  retract  the  wedge  against  the  lever pivot  pin.    In  this  position,  the  plug  should  be  even with  lining  surface  +  0.00  to-0.512  mm  (+  0.00  to- 0.006  inch  If  plug  is  high,  clamp  shoe  in  a  vise  so that  the  jaws  of  the  vice  bear  against  the  adjuster lever  (Fig.    7)  and  dress  down  the  plug  with  a  file. Take care not to create a flat spot on the lining.  An alternate method is to dress the plug when the shoes are  ground  to  a  true  radius;  however,  lever  must  be blocked in its extended position. 7. Make  sure  that  brake  backing  plate,  wheel  cylinder anchor    bolts    and    cylinder    mounting    screws    are tightened securely. 8. Install shoes on hold-downs, locating each retracting spring so that its long shank is hooked at the anchor end of the shoe. CTS-2491T  Page 4 PRINTED IN UNITED STATES OF AMERICA

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