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Installation and Service Instructions for 
87,000; 87,100; 87,200; 87,400 and 87,600 Series

Important

Please read these instructions carefully before 
installing, operating, or servicing your Stearns 
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 Rexnord Industries, LLC, 
Stearns Division,  5150 International Dr., 
Cudahy, WI 53110, (414) 272-1100.

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. Use of this brake in atmospheres 

containing explosive gases and dusts 
must be in accordance with NEC article 
501. This brake is not suitable for use in 
certain atmospheres containing explosive 
gases and dusts. 

HazLoc

 inspection 

authorities are responsible for verifying and 
authorizing the use of suitably designed 
and installed 

HazLoc

 equipment. When 

questions arise consult local 

Authority 

Having Jurisdiction (AHJ)

.

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. Do not run motor with the brake in 

the manual release position to avoid 
overheating of friction disc.

11. Do not lubricate any parts of the brake.

12. Do not adjust brake torque. The nominal 

static torque is factory pre-set and should 
not be altered.

General Description

The 87,X00 Series is a spring-set, electrically 
released disc brake for controlled stopping and 
holding of a load. It is self-adjusting for friction 
disc wear and mounts directly to a NEMA 
C-face motor with 8-1/2” (AK) register and a 
7-1/4” (AJ) bolt circle.

The 87,100 Series Brake mounts to a

10-1/2” AK diameter register and 9” (AJ) bolt 
circle.

The brake is provided with a manual release 
lever or rod. When the motor is off and the load 
is to be moved without energizing the motor, 
the manual release lever or rod should be 
used. This removes the holding torque from the 
motor shaft, allowing it to be rotated by hand, 
however drag may be noted. The brake will 
remain in the manual release position until the 
release lever or rod is returned manually to its 
set position, or until the brake is re-energized 
electrically and the release lever or rod returns 
to its set position automatically.

Note:

 Fan-guard mounted brakes requiring 

IP54 & IP55 protection may require additional 
sealing measures beyond seals provided with 
this brake. Pressurized sprays aimed at the 
fan and brake hub surfaces can result in fluid 
migration along the motor shaft and keyway, 
and into the brake. The use of an appropriate 
sealant such as 

RTV

 or a 

forsheda

 seal is 

advised.

I. Installation Procedure - 87,000; 87,100; 
87,400 and 87,600

A. Remove manual release knob (148) (on 

pull type), housing nuts (15) and housing 
(7). Housings equipped with side manual 
release do not have release knob.

B. Depress solenoid plunger (29) and pull 

release rod (146) back to lock brake 
mechanism in manual release position or 
wire tie plunger (29) to frame (79). The 
87,600 Series Brake, brakes with optional 
deadman manual release and brakes with 
optional side manual release, the plunger 
must be wire tied to the frame.

C. Remove entire support plate assembly 

(142) by evenly unscrewing screw (142S). 
Remove screws, conical spring washers, 
and flat washers if supplied.

D. Remove pressure plate (5), friction disc (4), 

and stationary disc (3).

Note 1

: Brakes with a single friction disc do 

not have stationary discs. Vertically mounted 
brakes will have special pins which hold spacer 
springs and, in some cases, spring washers 
except one-disc vertical below. Note color 
coded sequence of springs and location of 
washers, if used, or refer to Instruction Sheet 
P/N 8-078-937-05 (Sheet 301.3) for proper 
assembly of vertical mounting components.

E. Attach endplate (2) to NEMA C-face of 

motor using four 1/2” diameter socket 
head cap screws (not supplied) torque per 
manufacturer’s specifications. (Head of 
cap screws must not project above friction 
surface.) If foot mounted, secure foot 
mounting bracket to foundation. The use 
of dowels to insure permanent alignment 
is recommended. Foot, machine or C-face 
mounted brakes must be carefully aligned 
within .004” on concentricity and face 
runout. Shaft runout should be within .002” 
T.I.R. Maximum permissible shaft endfloat 
is .020”.

Note 2

: If motor is to be ceiling mounted after 

assembly, entire brake will have to be rotated 
180° or “upside down” so it will be positioned 
with solenoid plunger (29) above frame when 
final assembly is mounted on ceiling. Similarly, 

®

 

Spring-Set Disc Brakes

P/N 8-078-927-00

effective 07/14/2017

Figure 1

2

150

16S

16

3

4

4

29

5

146

142S

7

15

148

Splined Configuration

16S

16S

16B

16A

4B

4A

16 tooth 

3.12 diameter

24 tooth 

4.24 diameter

Содержание 87,000 Series

Страница 1: ...lf adjusting for friction disc wear and mounts directly to a NEMA C face motor with 8 1 2 AK register and a 7 1 4 AJ bolt circle The 87 100 Series Brake mounts to a 10 1 2 AK diameter register and 9 AJ bolt circle The brake is provided with a manual release lever or rod When the motor is off and the load is to be moved without energizing the motor the manual release lever or rod should be used Thi...

Страница 2: ...slide the housing off the shaft Reverse the procedure for re assembly III Electrical Connection of Brake All Models CAUTION 1 Inverter Motor and Special Control Systems This brake contains either a single phase AC coil or DC coil that requires instantaneous power within 10 of rating at the coil A separate power source is required when this brake is used in conjunction with a motor or control syste...

Страница 3: ...Depress plunger manually or electrically and allow it to snap up Repeat several times then recheck air gap For vertically mounted brakes refer to Note in Section IV under Item C 2 Tang of wrap spring 71 must be below and must make contact with wrap spring stop 76 when solenoid lever 28 is manually raised If stop is bent outward allowing tang to bypass it rebend to square position assemble correctl...

Страница 4: ...ect setting may be verified and corrected if necessary With worn friction discs add amount of wear to the approximate spring length shown 20 If a heater is supplied and excess rusting has occurred in brake check power source to heater to be sure it is operating and that heater is not burned out 21 If stopping time is more than two seconds rule of thumb the brake torque rating may be insufficient I...

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