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MAINTENANCE AND SERVICE (Continued)
WEAR ADJUSTMENT
(See Figure 4 & Table 1)
As friction disc wears, the magnet air gap will increase. When “AIR
GAP” reaches 0.220” maximum, adjust to 0.045”- 0.060” for 1-disc
models, and 0.050”-0.065” for 2-disc models. To adjust: Hold pivot nut
(15), loosen lock nut (16), turn pivot nut (15) clockwise until “AIR GAP”
measures approximately 0.070” for 1-disc models, 0.075” for 2-disc
models at center of magnet (NOTE: Air gap should decrease slightly to
measure 0.045”- 0.060” for 1-disc models and 0.050”-0.065” for 2-disc
models when lock nut (16) is tightened against the pivot nut (15)).
Hold pivot nut (15) and tighten lock nut (16) against it. Operate brake
several times to see if air gap is maintained. If not, re-adjust following
same procedure again. Any delay in adjusting air gap will result in a
loss of torque and/or coil burn out.
MAGNET ASSEMBLY REPLACEMENT
(See Figure 4)
Remove cover nuts (19), cover (29), nuts (19) and magnet assembly
(21). Replace magnet assembly. Be sure rubber pads (20) are under
magnet bracket. Tighten nuts (19) to remove end play between nut
and magnet bracket. Tighten with an additional 1/3 turn (two flats on
nut). Check air gap as described under WEAR ADJUSTMENT.
Electrically reconnect the coil (See Figure 3). Reassemble cover and
cover nuts.
TROUBLESHOOTING
BRAKE DOES NOT RELEASE
Check for failure of power supply to brake.
Check brake visually for broken or damaged parts.
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.
TROUBLESHOOTING (Continued)
BRAKE DOES NOT RELEASE
Check for broken leadwire(s) or bad electrical connection(s).
Check for burned out coils (coils may be charred or burned).
BRAKE DOES NOT STOP
Check brake visually for broken or damaged parts.
Check disc wear (see WEAR ADJUSTMENT).
Check for broken friction disc.
Check hub. Be certain hub has not shifted position on shaft
and rotating disc is fully engaged on hub.
BRAKE CHATTERS OR HUMS
Clean magnet faces if dirty. Insert a clean sheet of paper between
the magnet faces and energize brake. Move paper around
between faces to dislodge dirt. Finally, remove paper.
Check if shading coil is cracked, broken or out of position (shading
coil is assembled into the magnet assembly (20).
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 springs (26). Replace if broken.
Check magnet air gap “AIR GAP” with lever in the reset position.
Gap must be no less than 0.045” at its narrowest point.
If gap is too small, motor shaft will not turn freely. Adjust to
correct magnet gap as described under WEAR ADJUSTMENT.
Figure 5. Exploded View of Brake
SEE TABLE 2 (PAGE 4)
FOR PARTS LIST
