MANUAL RELEASE (See Figure 5) To manually release the brake, rotate release knob (21) clockwise  until  it  strikes  stop  pin  (22).    The  brake  will remain  in  the  release  position  until  manually  reset,  or automatically reset when electric power is restored. MAINTENANCE AND SERVICE FRICTION DISC REPLACEMENT (See Figure 5) When   total   wear   on   rotating   friction   disc   reaches 1/16',;replace as follows: Remove  cover.    With  release  knob  (21)  in  released position,   remove   three   mounting   screws   (27)   and- remove operator assembly (6) as a unit Spring (5).  is a loose  part.    Avoid  loss.    Remove  stationary  discs  (3), install new rotating discs (4) and reassemble all parts in reverse order. After starting three screws (27), turn two wear adjustment screws (26) counterclockwise to allow. the   three   posts   on   end   plate   assembly   (7)   to   seat against the bracket (2).  Tighten screws (27).  Readjust magnet   gap   (see   WEAR   ADJUSTMENT).      Replace cover. MAGNET ASSEMBLY REPLACEMENT Remove  cover.    Unscrew  two  flat  head  screws  (13), remove  shoulder  nuts  (12)  and  rubber  washers  (11). Remove    and    replace    magnet    assembly    (9)    and reassemble'    parts    in    reverse    order.        Magnet    and armature  faces  must  be  clean  and  parallel  to  insure quiet   operation   (see   WEAR   ADJUSTMENT   -'   and TROUBLE  SHOOTING).    If  manual  release  does  not operate properly, see TROUBLE SHOOTING. Figure 3.  Brake Cap Adjustment Figure 4.  Wiring Diagram WEAR ADJUSTMENT (See Figure 3) When  armature  plate  (25)  touches  bracket  (2),  closing gap  "B,'  adjustment  for  friction  disc  wear  is  required. Turn  two  screws  (26)  clockwise  until  magnet  gap  'A" reads .040" to .045" at narrowest gap, for 1 and 2 disc 'models, and reads .050" to .055" at narrowest gap, for 3 disc  models.    Any  delay  in  adjusting  gap  will  result  in eventual loss of torque. TORQUE ADJUSTMENT The 60 Series Brake is factory set for rated static torque. To  increase  stopping  time  and  lower  torque,  turn  two .locknuts  above  torque  springs  (16)  counterclockwise, increasing   spring   length.      Each   full   turn   decreases torque by approximately 10%.  Do not adjust brakes for higher torque, as this will cause premature coil burnout. TROUBLE SHOOTING BRAKE DOES NOT RELEASE Check for failure of power supply to brake. Check brake visually for broken or damaged parts. Check for broken leadwire or bad electrical connection. Check for correct voltage.  Voltage must correspond to that  listed  on  brake  nameplate.    If  voltage  is more    than    10%    below    figure    stamped    on nameplate, magnet will not pull in, causing coil to  burn  out  within  minutes.    If  voltage  is  more than 10% above, coil will overheat and burn out. Check   for   burned   out   coil   (coil   may   be   charred   or burned). BREAK DOES NOT STOP Check that manual release is in normal reset position. Check brake visually for broken or damaged parts. Check disc wear (See WEAR ADJUSTMENT). Check for broken friction disc. Make  certain  hub  has  not  shifted  position  on  shaft  and that all rotating discs are fully engaged on hub. BRAKE CHATTERS OR HUMS Clean  magnet  faces  if  dirty.    Insert  a  clean  sheet  of paper between magnet faces and energize brake.  Move paper  around  between  faces  to  dislodge  dirt.    Finally, remove paper. Check that magnet faces are parallel in closed position. 1. If  not  parallel  along  length  of  magnet,  check bushings  (14)  under  torque  springs  for  binding or excessive wear. 2. If  not  parallel  across  width  of  magnet,  adjust pivot nut (8) on post to obtain minimum magnet hum.    After  adjusting  pivot  nut,  lock  in  place with  nut  (item  7,  part  "C").   Check  magnet  gap "A"    and    adjust    if    necessary    (See    WEAR ADJUSTMENT ).  Operate manual release (21) and adjust if necessary. Check if shading coil (10) is cracked, broken or out of : position.    Replace  magnet  assembly  if  cracked or broken. Check for low voltage.  Magnet will not pull in and coil will burn out if voltage is more than 10% below figure stamped on nameplate. MANUAL   RELEASE   DOES   NOT   WORK   Check   for broken or damaged parts. Check    return    spring    (24).        Brake    will    not    reset automatically if this spring is broken. Check magnet gap "A" with knob in released position. Gap  must  be  .030"  at  narrowest  point.    If  gap  is  too wide, motor shaft will not turn freely.  If gap is too small, knob will not return automatically when power is applied. Adjustment  for  correct  magnet  gap  is  made  by  turning nuts  (18  and  19).    Make  sure  nuts  are  tight  against armature plate (25) after adjusting release.