SERVICE MANUAL 17. Install  seal  ring  (12)  in  lower  body  and  secure lower  body  to  upper  body  using  four  hex  head capscrews  and  lockwashers;  torque  capscrews to 7.9 - 11.3 N.m (70 - 100 in lbs). 18. Install   treadle   assembly   to   basic   brake   valve using   three   5/16-18   hex   head   capscrews   and lockwashers; torque to 9 - 11.3 N.m (80 -100 in lbs). 19. Test     the     rebuilt     E6     dual     brake     valve     by performing    operation    and    leakage    tests    out- lined in SERVICE CHECKS. DISASSEMBLY Suspended Pedal Type Valve (17)) Refer to Fig. 9 for numbers in parenthesis. 1. Remove three capscrews and pedal assembly. 2. Apply  force  on  retainer,  disengage  locking  tabs from body and remove retainer (7). 3. Grasp     lock     nut     (5)     of     lower     static     piston assembly     (10)     with     pliers     and     pull     piston assembly from body (12). 4. Fasten a hook from a 152 mm (6") piece of .125 mm  (1/8")  diameter  wire  (approx.),  bending  one end 90 degrees at a length 12.7 to 19.mm (1/2" to  3/4")  from  end  of  wire.    Insert  hook  end  in bore  of  body  and  through  secondary  inlet  valve exhaust bore hooking onto valve.  Pull firmly and remove  upper  static  piston  (15)  assembly  with secondary inlet and exhaust valve (16). 5. Apply firm pressure on spring seat (6) which will compress  primary  piston  spring  (11).    Locking groove  (20)  in  piston  is  now  accessible  through rectangular   opening   in   body.      Insert   wire   on screwdriver   into   locking   groove,   thus   holding primary piston spring (11) in compressed position. 6. Insert    blade    of    screwdriver    through    exhaust passage  of  secondary  and  primary  pistons  and into slot of stem (1).  Back off locking nut (5). 7. Remove  locking  nut  (5),  spring  stem  guide  (4) and stem spring (3). 8. Remove spring seat nut (2), spring seat (6) and rubber spring (9) using same type procedure as item 6. 9. Removal   of   screwdriver   or   wire   from   locking groove    will    permit    spring    load    to    push    out primary piston (8) and relay piston (13). Care  should  be  used  when  removing  tool  from  locking ring because of spring load. 10. Remove   primary   piston   (8)   and   return   spring (11), and relay piston (13) and return spring (14). 11. Remove  stem  (1)  and  O-rings  from  relay  and primary pistons. 12. Remove  O-rings  from  upper   static   piston   (15) and lower static piston (10). 13. Remove   large   retaining   ring   (17)   from   lower static  piston  and   remove   primary   inlet/exhaust valve  assembly  (18).    Disassembly  of  inlet  and exhaust   valve   is   not   required   since   it   is   only serviced as an assembly. 14. Remove   large   retaining   ring   (19)   from   upper static piston assembly (15) and remove secondary inlet/exhaust valve assembly (16). CLEANING AND INSPECTION Wash  all  metal  parts  in  cleaning  solvent  and  dry  them. Inspect   all   parts   for   excessive   wear   or   deterioration. Inspect valve seats for nicks or burrs.  Check springs for cracks  or  corrosion.    Replace  all  rubber  parts  and  any part not considered REASSEMBLY Suspended Pedal Type Valve (17) Before starting to reassemble brake valve lubricate all O- rings,  O-ring  grooves,  piston  bores  and  metal  moving parts with Item 1 in LUBRICANT SPECIFICATIONS. Refer to Fig. 9 for numbers in parenthesis. 1. Install new secondary inlet/exhaust valve assembly   (16)   in   upper   static   piston   (15)   and secure   with   retainer   ring   (19)   making   certain retaining   ring   is   engaged   in   groove   of   upper static piston bore. 2. Install   O-ring   on   upper   static   piston   assembly and install in body of valve. 3. Install primary inlet/exhaust valve assembly (18) in    lower    static    piston    (10)    and    secure    with retainer ring (17) making certain retaining ring is engaged in goove in lower static piston (10). 4. Install  three  O-rings  in  grooves  of  lower  static piston assembly (10). The larger diameter O-ring is installed in groove nearest to bottom of piston assembly. CTS-4079 - CHAPTER IV - Page 9