Rexnord Industries Stearns 55,700 Series User manual

Service Instructions for No. 4 AC Solenoid Kit
Series 55,700 Disc Brakes
®
Brake Replacement Parts
P/N 8-078-945-05
effective 9/25/98
Important
Please read these instructions carefully
before 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, Inc., Stearns
Division, 5150 S. International Dr., Cudahy
Wisconsin 53110, [phone].
Caution
1. Installation or 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
installing or servicing of the brake. If
power disconnect point is out of sight,
lock disconnect in the
off position and
tag to prevent accidental application
of power.
3.The exterior surface of an operating
brake may be hot enough to cause
injury. Allow sufficient time for the brake
to cool before disassembly.
4. Do not operate brake with housing
removed. All moving parts should be
guarded.
5. 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.
6. Installation or maintenance should be
performed only by qualified personnel
familiar with the construction and
operation of the brake.
7. For proper performance and operation,
only genuine Stearns parts should be
used for repairs and replacements.
Warning! Any mechanism or load held in
position by the brake should be secured
to prevent possible injury to personnel or
damage to equipment before any
disassembly of the brake is attempted or
before the manual release knob or lever is
operated on the brake.
Instructions
1. Remove housing (7) by unscrewing
nuts from the four mounting studs
(128) that protrude through the
reducer flange.
2. Grasp the coupler brake and motor as
a unit and pull free from the reducer.
3. Pull housing from the mounting studs
(128).These studs are threaded into
the C-face and should remain in place.
4. Solenoid replacement can be
accomplished without removing the
support plate from the brake.
5. Disconnect coil lead wires. Remove
three solenoid mounting screws (132)
to free solenoid frame (79). Note
mounting position.
29
13
79
13C
13N
132
Solenoid plunger
Solenoid link
Solenoid frame
Solenoid link cap screw
Solenoid link nut
Solenoid mounting screw
1
1
1
1
1
3
Item
No. Description of Parts
Included in Kit Quantity.
per
Kit

6. Disconnect solenoid plunger (29) and
solenoid link (13) as an assembly and
discard.
7.To remove coil (12A) unscrew plunger
guide screw (84) and lock washer
(84W). Remove both plunger guides
(82) by prying up on the flanges.
a) To remove coil (12B) lift plunger
guide (82A) out of top of solenoid
frame (79).To remove coil (12B)
from solenoid frame (79), depress
lock tab at opposite lead wire side
of coil and slide coil sideways from
frame.
Note: If coil has burned out, be
sure to remove all foreign material
from solenoid plunger (29) and
solenoid frame (79).
8. Install coil (12A) or (12B) in reverse
order of 5 or 5a. Be sure that coil is
installed in solenoid frame in same
position and lock tab on coil (12B)
latches on solenoid frame.
9. Join new link (13) with cap screw
(13C) and nut (13N) to plunger (29).
Reinstall link to pin with spacers and
retaining ring. Mount frame (79) (with
plunger installed) with screws (132) in
same mounting position as removed.
Torque screws to 43 in-lbs after
aligning frame and plunger.
10. Manually lift solenoid plunger to
maximum travel. Depress and allow
solenoid plunger to snap out several
times. Measure solenoid air gap
between mating surfaces of solenoid
frame and solenoid plunger. (On
vertically mounted brakes, it will be
necessary to push solenoid plunger
into solenoid frame to the point where
spring pressure is felt, before
measuring solenoid air gap.)
If solenoid air gap exceeds gap in
Table, adjustment is suggested.
The solenoid air gap measurements
are shown in Table below.
11.The solenoid air gap may be
decreased by turning both wear
adjustment screws (10) equal
amounts clockwise, approximately
1/8 turn, until approximate solenoid
gap is attained. Counterclockwise
rotation will increase gap.
12. Reconnect solenoid coil leads.
13. Replace housing (and housing nuts) in
reverse order of the appropriate point
in step 1.
14. Caution! Do not run motor with brake
in manual release position. It is
intended only for emergency manual
movement of the driven load, not as a
substitute for full electrical release.
NOTE: For complete instructions,
with
troubleshooting,
request sheet
applicable to the series of brake that
you have.
Nominal 55,700
Static Torque
(lb-ft)
1.5, 3 13/32
6 1/2
10 1/2
15 9/16
Table: Solenoid air gap measurements
Rexnord Industries, Inc.
Stearns Division
5150 S. International Dr.
Cudahy, Wisconsin 53110
Phone [phone] Fax [phone]
Copyright©1998 by Rexnord Industries, Inc.