SERVICE MANUAL Fig. 23 Brake Chamber (Cross Sectional View) 1 Rod, Push 8 Plate, Nonpressure 2 Plug 9 Washer, Lock 3 Diaphragm 10    Nut 4 Plate, Pressure 11    Nut, Lock 5 Retainer, Spring 12    Pin, Cotter 6 Spring 13    Pin, Clevis 7 Clamp 14    Yoke, Clevis particular spring brake chamber involved. Remove Disconnect  air  line  and  push  rod  yoke.    Remove    nuts from  mounting  studs  and  remove chamber. Install Position brake chamber on mounting bracket and install nuts  on  mounting  studs.    Install  lock  nut  and  yoke  on push   rod.      Connect   air   line.      Adjust   yoke      to      slack adjuster  (see ADJUS ).  Be sure end of push rod does not bind with slack adjuster when brakes are applied. Disassemble To     disassemble     the     brake     chamber     (numbers     in parenthesis) refer to Fig. 23. 1. Mark    non-pressure    plate    (8),    pressure  plate (4)  and  clamp  (7).  This  will  make  it  easier  to reassemble  air  chamber    in  its  original  position and avoid installation interference. 2. Remove  yoke  (14)  and  lock  nut  (10)  from  push rod (1). 3. Remove     nuts     and     bolts     from     clamp     ring. Separate   plates    carefully    since    return    spring inside brake chamber is under tension. 4. With  two  sections  of  brake  chamber  separated remove push rod, spring retainer (5)  and  spring (6)  from  non-pressure plate. Cleaning and Inspection After  brake  chamber  has  been  disassembled,  proceed as follows: 1. Using a suitable cleaning solvent, clean all metal parts thoroughly. 2. Examine  diaphragm.   If  any  signs  of damage or  deterioration  are  evident,  replace  diaphragm. When one diaphragm requires replacement, it is good    practice    to    replace    all    brake    chamber diaphragms in the system while vehicle is out of service.    Brake    chamber    diaphragms  must  be replaced  once  each  year  or  every  160,000  km (100,000 miles) regardless of condition. 3. Inspect  push  rod,  spring  and  spring  retainer.    If parts    are  damaged,  they  should  be  replaced. Check return springs.If a load scale is  available, compare their tension with new spring.  Matching an   old   spring   with   a   new   spring   will   indicate condition of old part. 4. Check condition of non-pressure plate. If clamping    flanges    on    plates    are    dented    or damaged, replace plates. Reassemble 1. Install  nuts  (10)  on  mounting  studs  and  clamp non-pressure plate (8) in vise with inside of plate facing up. 2. Install spring (6) in spring retainer (5). 3. Install     push     rod     assembly     in     body,     press assembly    down    (brake    applied    position)    to compress   spring   and   use   vise   grip   pliers   on outside of push rod to hold spring compressed. 4. Install diaphragm (3) in pressure plate (4). 5. Position brake chamber plates matching up etch marks made prior to disassembly. 6. Install  clamp  (7)  with  bolts  and  nuts  and  tighten nuts  to  17  N.m    (150  in.    lbs.)  torque.  Remove vise grip pliers. CTS-4080W - Page 16