background image

®

 

Spring-Set Disc Brakes

P/N 8-078-889-00

effective 01/04/13

Installation and Service Instructions for 320 Series
AAB Spring-Set Brakes 

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 Corporation, Stearns 
Division, 5150 S. lnternational Dr., Cudahy, Wisconsin 
53110, (414) 272-1100.

OEM’s and subsystem suppliers, please forward these 
instructions with your components to the final user.

Caution

1. Servicing shall be in compliance with applicable 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. 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 to system.

3. To avoid damage to internal power supply, hipot testing 

should not exceed 1500 volts for one second. Brake 
coil leads must be connected together.

4. Heat developed during normal operation (135°C) of the 

brake may be hot enough to be painful or cause injury. 
Be careful when touching exterior surfaces. Allow 
sufficient time for the brake to cool before servicing.

5. After usage, the brake will contain burnt and degraded 

friction material dust. This dust should 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.

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.

Installation

The brake can be mounted on either face. With units 
mounting on the hub end, the hub should be secured to 
shaft before mounting brake. Two set screws are provided 
and should be tightened securely. Refer to Table A for 
set screw torque. The key should not extend towards the 
armature or past the face of the hub. Refer to Table B or 
C for positioning of hub. Mount brake to register using 
screws or bolts. Refer to Table A for mounting torque. 

Lock washers are optional. The rated voltage should be 
available at the brake and allowance should be made 
for voltage drop in long wiring runs. The optional, factory 
installed, manual release lever is a rotary maintained 
design.

Note: 

Position of hub should allow full engagement of 

friction disc without interfering with the movement of 
the armature. Motor shaft end float should be taken into 
consideration when positioning the hub.

Table A

* An adapter plate is available for mounting on motors with four equally 

spaced holes on a 2.844 inch bolt circle.

Table B

* This dimension is for units mounting on hub end, and using short 

version of the hub. Factor in motor shaft end float; do not allow hub to 
contact armature.

Angular

Parallel

.005

.005

.003 to .015

.015*

See back page

.49

2.8

2.0

.005

.005

.003 to .015

.015*

.17

1.8

.005

.005

.003 to .012

.015*

.21

1.2

Maximum Allowed 

Misalignment (inches)

Operating

Range

Air Gap 

(inches)

X

1

Hub

Position 

(inch)

X

Size

Set Screw Torque

Mounting Screws

AAB

Size

Short 

Hub

Long 

Hub

Size

1.2
1.8

 2.0*

2.8

9-10 lb-in
9-10 lb-in
9-10 lb-in
9-10 lb-in

9-10 lb-in

18-20 lb-in
18-20 lb-in
18-20 lb-in

#4
#6
#6
#8

Max 

Torque

Min 

Req

11 lb-in
20 lb-in
20 lb-in
37 lb-in

3
2
3
2

Отзывы:

Похожие инструкции для Stearns AAB 320 Series