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Fig.  1 DCM Parking Brake (Exploded View)
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.   2 Parking Brake  Adjustment in the Orscheln Hand Lever
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BRAKES-PARKING DESCRIPTION The  Model  DCM  parking  brake  features  a  balanced design   which   provides   improved   mechanical   efficiency   and equally   divides   the   input   force   between   both   shoes.      This extends   lining   life   and   reduces   transmission   rear   bearing stress. The  DCM  brake  operates  both  as  a  parking  and  an emergency  brake.    Equal  torque  output  is  exerted  in  either direction   of   vehicle   travel   with   minimum   input   force   and stroke.  Stops are controlled with maximum protection against damage to vehicle chassis components.  Cam design applies brake with either direction of lever movement. DISASSEMBLY There  are  only  nine  (9)  parts  in  the  DCM  parking brake.      The   following   instructions   are   given   as   an   aid   in disassembling and reassembling this unit. Refer    to    Fig.        1    for    parts    identification    during "Disassembly" and "Reassembly". Disconnect  end  yoke  pin  connecting  control  rod  or cable, whichever is applicable, to brake operating lever (7). Remove  brake  drum  mounting  bolts  and  pull  drum (1)  free  of  brake  or  drop  prop-shaft,  whichever  is  necessary. Pull one shoe off the anchor pin sufficiently to allow the strut (2) to be pulled free of the retaining lance on the shoe table. Lift  the  strut  (2)  away  from  the  cam  shaft  (3)  and  pull  it  free from the retaining lance on the other shoe. Remove  both  shoe  return  springs  (6).    Brake  shoes (4) can now be removed by lifting them off the anchor pins. The backing plate (5) may be removed after the four mounting bolts are removed.  These bolts are shoulder bolts having a thin head to provide clearance for the strut (2). To   remove   operating   lever   (7)   from   camshaft   (3) unscrew   lock-nut   (9)   from   cam-shaft   and   pull   lever   free. Cam-shaft assembly may then be pulled out of back plate (5). CLEANING, INSPECTION AND REPAIR If  linings  are  oil  soaked  or  greasy,  replace  with  new lining  preparatory  to  replacement.    If  linings  are  not  greasy, brush  dirt  from  them  with  a  wire  brush;  then  wipe  off  with  a cloth.   Wash   all   parts   other   than   brake   lining   in   a   clean cleaning solvent and dry with compressed air. Inspect    brake    shoe    linings    for    wear,    cracks    or breakage.    If  linings  are  worn  to  near  rivets  they  must  be replaced.    Inspect  brake  drum  for  deep  scores  or  damage, and if damaged, replace. If   linings   are   worn   too   near   rivet   heads,   or   are otherwise  damaged,  punch  out  old  rivets  and  remove  linings from  brake  shoes.    Install  new  linings  tightly  against  brake shoes using new rivets.  Umbrella type rivets may be used for increased  lining  life.    Compress  rivets  tightly  using  riveting equipment.    If  any  other  parts  of  the  brake  assembly  show signs of wear or damage, replace as required. REASSEMBLY Reassembly  of  the  parking  brake  unit  is  essentially the   reverse   of   disassembly,   however,   a   few   suggestions mentioned below may prove helpful. When  installing  the  operating  lever  (7)  on  the  cam- shaft  (3),  the  cam  must  be  in  the  neutral  position.    Position the  operating  lever  on  the  cam-shaft  so  that  it  will  connect with the linkage. The    cam-shaft    lock-nut    (9)    should    be    tightened sufficiently   to   prevent   the   assembly   from   rocking,   but   still allow it to turn freely. It is important that the brake shoe return springs (6) be  installed  on  the  lever  side  of  the  brake  shoes  (4)  as  they act as both a hold down and return spring. LUBRICATION The  only  lubrication  required  on  the  parking  brake unit is to apply a thin coating of grease to all bearing surfaces. DO NOT overlubricate brake parts. CTS-2210P  Page 3 PRINTED IN UNITED STATES OF AMERICA

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