LEESON 143-5TC User Manual
Tools required for installation and servicing:
3/8” hex wrench 5/16” nut driver 5/16” hex wrench Torque wrench
1/4” screwdriver 3/16” hex wrench 8” adjustable wrench
Installation and Service Instructions
for 56/143-5TC Double C-Face Coupler
Important
Please read these instructions carefully
before installing, operating, or servicing
your brake. Failure to comply with these
instructions could cause injury to personnel
and/or damage to property if the brake is
installed or operated incorrectly. For definition of limited warranty/liability, contact
Leeson Electric Corporation, P.O. Box 241,
2100 Washington Street, Grafton, WI
53024-0241, (262) 377-8810.
Caution
1. Installation and servicing must be made
in compliance with all local safety codes
including Occupational Safety and
Health Act (OSHA). All wiring and electrical connections must comply with the
National Electric Code (NEC) and local
electric codes in effect.
2. Do not operate the brake in
atmospheres containing explosive
gases or dusts.
3. To prevent an electrical hazard, disconnect power source before working on
the brake. If power disconnect point is
out of sight, lock disconnect in the off
position and tag to prevent accidental
application of power.
4. Make certain power source conforms to
the requirements specified on the brake
nameplate.
5. Be careful when touching the exterior of
an operating brake. Allow sufficient time
for brake to cool before disassembly.
Surfaces may be hot enough to be
painful or cause injury.
6. Do not operate brake with housing
removed. All moving parts should be
guarded.
7. Installation and servicing should be performed only by qualified personnel
familiar with the construction and operation of the brake.
8. For proper performance and operation,
only genuine Stearns parts should be
used for repairs and replacements.
9. After usage, the brake interior will contain burnt and degraded friction material
dust. This dust must be removed before
servicing or adjusting the brake.
DO NOT BLOW OFF DUST using an air
hose. It is important to avoid dispersing
dust into the air or inhaling it, as this may
be dangerous to your health.
a) Wear a filtered mask or a respirator
while removing dust from the inside of a
brake.
b) Use a vacuum cleaner or a soft brush
to remove dust from the brake. When
brushing, avoid causing the dust to
become airborne. Collect the dust in a
container, such as a bag, which can be
sealed off.
10. Caution! While the brake is equipped
with a manual release to allow manual
shaft rotation, the motor should not be
run with the manual release engaged, to
avoid overheating the friction disc(s).
Warning! Do not apply overhung or side
load to brake output shaft
General Description
The 56,700 Series coupler is a spring-set,
electrically released brake, containing either
one or more rotating friction discs (4) driven
by a hub (16) mounted on the motor shaft.
The double C-face allows the brake to directly
couple a C-face motor to a C-face gear
reducer.
Figure 1
(See Page 4
For replacement parts refer to sheet
part number 8-078-906-07.
Instructions and parts list also available at www.rexnord.com/stearns.
ELECTRIC MOTORS
GEARMOTORS AND DRIVES
P/N 8-078-905-68
effective 03/25/2005
LEESON ELECTRIC P.O. BOX 241 2100 Washington Street Grafton, WI 53024-0241 U.S.A
A Subsidiary of Regal-Beloit Corporation
Drain Plug
(WASHGUARD brakes only)
Position hub on shaft as shown.
Place hub on motor shaft.
Tighten set screws to motor shaft.
Connect coil leadwires to power
supply. Refer to
nameplate for
voltage rating.*
Caution: Keep
wiring away from
pinch points and
moving components.
.188”
(4.77mm)
BRAKE MOUNTING (Manual Adjust)
* Stabilizer clips
are for use on
single disc units
only. Position
clips opposite
set screw holes.
3A
Remove support plate screws and
lift support from brake
Reposition support plate on endplate and
tighten mounting screws to 55 lb-in.
Install new friction disc(s) and
stationary disc(s) as shown.
Remove and discard old friction disc.
clockwise
For brakes
with vertical
springs see
Vertical
Spring
Assembly
Section.
FRICTION DISC REPLACEMENT SERIES
2
Note: Friction discs can wear to 1/2 their original thickness, or .093”
A. Remove housing nuts and slide tie bolt out of brake.
B. Remove housing from endplate.
Slide endplate over hub noting position of stabilizer
clips, if used. (Refer to Friction Disc Replacement
view 3 and 3A). Mount brake endplate to
motor C-face using the four tie bolts.
Finger tighten.
A. Slide housing and shaft assembly onto mounting studs, rotating
shaft until keyway is aligned. Be sure housing is assembled with
access windows in same position as shown in Figure 1, page 1.
B. Mount and secure brake/motor assembly to
C-face mounting register of reducer.
Using four 3/8 - 16 nuts and
lockwashers, tighten to 30-35 ft-lb.
clockwise
counter-
clockwise
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