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DESCRIPTION - TM-5-4210-230-14P-1_405
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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REINSTALL BRAKE SHOES
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 on  floor  jacks.    Brake  drag  is  checked  by  "feel",  rotating  the drum   in   the   direction   of   forward   rotation   as   adjustment   is made. Be sure the wheel bearings are properly adjusted (refer to WHEELS,  RIMS,  TIRES  Section,  CTS-2032)  and  with  brake drums cool. Adjust  each  shoe  in  turn  by  rotating  adjuster  cam  stud and  drum  in  forward  direction  of  drum  rotation  until  a  light drag is noticeable (Fig.  4).  Do not apply excessive force on stud  -13.6  Nm  (120  in.    lbs.)  maximum.    Back  off  adjuster stud  slightly  (approximately  6  to  12  degrees).    Drum  should turn freely. Repeat procedure on opposite cam stud. Perform same operation on brake group on opposite side of vehicle. BRAKE SHOE REMOVAL Refer to Fig.  1 for numbers in parenthesis. 1. Position  vehicle  on  floor  stands  so  that  the  wheels are free to turn. 2. Remove wheel hub and drum assemblies. 3. Secure    pistons    in    wheel    cylinders    with    cylinder clamps. 4. Remove brake shoe retracting springs. 5. Remove  each  shoe  hold-down  "C"  washer  (12)  and washer (11). 6. Pull  shoes  free  from  adjuster  cams  and  then  rotate shoe    from    brake    group    freeing    ends    of    wheel cylinders. If wheel cylinder connector tubes (21) are removed, mark wheel cylinder ports to which tubes are attached to avoid error in   re-assembly.      Difficulty   will   be   encountered   in   bleeding operation if tubes are assembled in wrong location. Fig.  4  Brake Adjustment CLEANING AND INSPECTION Thoroughly clean all parts (except drums) free of dirt and grease with cleaning solvent and wipe dry. Because    studies    have    indicated    that    exposure    ,    to excessive amounts of asbestos dust may be a potential health hazard,  OSHA  has  set  maximum  limits  of  levels  of  airborne asbestos dust to which workers may be exposed.  Since most automotive    friction    materials    normally    contain    a    sizable amount  of  asbestos,  it  is  important  that  people  who  handle brake    linings    be    aware    of    the    problem    and    know    the precautions to be taken. OSHA   standards   should   be   consulted   with   respect   to mandatory requirements as well as for suggested procedures to minimize exposure. DRUMS, BRAKE SHOES AND LINING For  complete  details  pertaining  to  reconditioning  drums and shoes, refer to CTS-2779. 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. The   two   wheel   cylinders   mounted   on   one   brake   are identical;   HOWEVER,   CYLINDERS   FOR   LEFT   OR   RIGHT HAND BRAKES HAVE OPPOSITE CASTINGS. Clean   mating   surfaces   of   cylinders   and   backing   plate before assembly to insure proper alignment. RETRACTING SPRINGS Inspect   retracting   spring   for   distortion   such   as   nicks, twisted shanks or spread of coils.  Damaged spring must be replaced. ADJUSTING CAM AND SHOE GUIDE STUDS Adjustment cam and shoe guide studs are equipped with friction  springs.    They  should  easily  turn  with  a  wrench,  but should  not  be  loose.    If  frozen,  lubricate  with  penetrating  oil and work free. CTS-2078T - Page 4 PRINTED IN UNITED STATES OF AMERICA

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