Quantcast REFINISHING BRAKE DRUMS

Order this information in Print

Order this information on CD-ROM

Download in PDF Format

     

Click here to make tpub.com your Home Page

Page Title: REFINISHING BRAKE DRUMS
Back | Up | Next

Click here for a printable version

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Combat
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
USMC
   
Products
  Educational CD-ROM's
Printed Manuals
Downloadable Books
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
DRUM BRAKES
Up
TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
Next
REPLACING LINING ON SHOES
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BRAKES-HYDRAULIC Fig 5   Checking Drum Runout on Brake Drum Lathe REFINISHING BRAKE DRUMS On  brake  drums  manufactured  after  January  1,  1971,  the maximum diameter to which drum can be worn is stamped or cast into drum. Drum should be discarded if worn beyond this limit. Minor  scores  on  brake  drum  can  be  removed  with fine emery cloth or steel wool, but always clean emery or steel wool  particles  from  drum  after  this  operation.    More  heavily damaged  or  out-of-round  drums  should  be  ground  or  turned on brake drum lathe. If   depth   of   scoring,   bellmouth   or   barrel   shaping exceeds .13 mm (.005 in.), measured with micrometer across part   or   all   of   brake   surface,   drum   should   be   refinished. Reboring or remachining limits must not be exceeded and no heat checks, cracks or bluing is evident. Use  a  micrometer  also  to  check  for  an  out  of-round drum.      Make   check   by   measuring   drum   brake   surface diameter  at  various  points,  45  apart  around  circumference. Eccentricity  (out  of-round)  should  not  exceed  .25  mm  (.010 in.) on diameter. Remember  that  each  time  brake  drums  are  turned, less  metal  remains  to  absorb  the  heat  developed  by  braking action.    Brake  drums  containing  less  metal  will  operate  at  a higher  temperature.    As  a  result,  brake  fade,  slow  recovery and erratic wear will be more noticeable.  Also, extremely high temperatures  shorten  lining  life  and  cause  heat  checks  and cracks  (Fig.  6)  to  form  on  inner  surface  of  drums.    These conditions will become progressively worse until drums fail. Fig 6   Cracked  Drum REMACHINING DRUMS Brake drums that are otherwise in good condition can be  turned  in  a  lathe.    However,  it  must  be  remembered  that the recommended remachining or rebore limit for brake drums 355  mm  (14  in.)  diameter  and  under  must  not  exceed  1.52 mm (.060 in.) diameter (total cut) and discarded at 2.29 mm (.090 in.) over original diameter. Brake drums with a diameter over 355 mm (14") may not  be  increased  more  than  2.03  mm  (.080")  diameter  (total cut) and discarded at 3.05 mm (.120") over normal diameter. These  dimensions  hold  true  for  both  drums,  which have   maximum   diameter   identification,   as   well   as   drums which are not. IMPORTANT The   dimension   located   on   the   drum   is   the discard  dimension.    Never  remachine  drums to maximum wear or discard diameter. There  are  some  drums  which  appear  to  have  an exception to this; however, this is not true. Example: Original Diameter 11 1/32 or 11.030 inch Maximum remachining limit 11.090 inch Maximum wear or discard limit 11.120 inch While an 11 inch diameter drum would be: Original diameter 11.000 inch Maximum Remachine Limit 11.060 inch Maximum Wear or Discard Limit 11.090 inch CTS-2779  Page 4 PRINTED IN UNITED STATES OF AMERICA

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing

Integrated Publishing, Inc.