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CHAPTER III CLEANING, INSPECTION AND SERVICE
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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BRAKE PEDAL ADJUSTMENT
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 MASTER CYLINDER AND WHEEL CYLINDERS It   is   possible   to   rehone   most   cylinders   and   place them  in  good  working  condition;  however,  this  requires  the use  of  up-to-date  honing  equipment.    A  cylinder  hone  kit  is available urlder number SE-1679. Cylinder castings may be degreased or cleaned with most commercial parts cleaners, provided they are thoroughly rinsed  with  denatured  alcohol  or  clean  brake  fluid  to  remove all traces of solvent.  Use compressed air or a lint-free cloth to dry parts after removing them from the cleaning solvent.  All hydraulic   parts   must   be   thoroughly   cleaned   and   protected (after  cleaning)  from  dust  or  other  air-borne  foreign  material until  reassembly.    Do  not  use  cotton  waste  for  cleaning  or drying parts, as particles of lint or thread fibers may block the compensating ports when cylinder is placed in service. Clean    rubber    parts    by    washing    them    in    clean denatured alcohol or hydraulic brake fluid. IMPORTANT Do   not   use   minter-base   cleaning   solvents such  as  gasoline,  kerosene,  distillant,  carbon tetrachloride,  acetone,  paint  thinner,  etc.    to clean   rubber   parts.      These   solvents   attack rubber  parts,  causing  them  to  become  soft, tacky and swollen in an extremely short time. After   cleaning,   hold   the   cylinder   casting   toward   a strong  light  and  sight  through  the  cylinder  bore.    Blemishes such     as     pitting,     scratches     and     visible     wear     patterns necessitate unit replacement. Accumulations   of   dirt   or   gummy   substances,   not removed  during  the  cleaning  process,  may  be  removed  with crocus  cloth  or  jewelers  rouge.  A  hone  (SE-1679)  may  be used   to   "clean-up"   the   cylinder   provided   its   use   does   not materially increase the diameter of the cylinder bore. If master or wheel cylinders must be honed, remember that the cylinder diameter must not be materially increased.  In other words, scratches and pits in cylinder   walls   render   the   unit   useless,   as   honing   the   bore sufficiently to remove them would increase the bore diameter to  the  point  that  new  piston  cups  will  not  seal  properly.    The possibility  that  the  cylinder  may  have  been  honed  during  a previous overhaul should not be overlooked. IMPORTANT After    honing    a    cylinder    and    obtaining    a blemish free bore, check the maximum piston clearance using a 6.35 mm (1/4") wide feeler gauge with a thickness as follows: Cylinder Bore Gauge Thickness mm Inch mm Inch 19.050-30.163 3/4-1 3/16 .1524 .006 31.750-36.513 1 1/4-1 7/16 .1778 .007 38.100-Up 1 1/2-Up .2038 : . .008 If  the  piston  can  be  inserted  with  the  feeler gauge in the cylinder bore, the unit should be replaced.  If the piston cannot be inserted, the cylinder may be reused. Be certain that the honed cylinder has no burr at the compensating   or   inlet   ports,   as   it   would   damage   the   new piston cup lip.  If a burl or sharp edge is present anywhere in the cylinder bore, it must be removed. At final inspection, be certain that the master cylinder compensating  ports  are  open.    A  soft  copper  wire  may  be used to probe the compensating port.  Do not use a steel wire. Wheel  cylinders  should  be  reconditioned  whenever brake lining is replaced because of the following: 1. As  lining  wears,  wheel  cylinder  rubber  cups  move back and forth over a new, widened smooth area. 2. Corrosion and foreign matter builds up on the part of the cylinder walls where cups do not work. CTS-2055S  Chapter III Page 3 PRINTED IN UNITED STATES OF AMERICA

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