Warner Electric Blade Brake Clutch Application Guide - Manual (Page 2)

2 Warner Electric • 800-825-9050 P-1319-WE • 819-0465
II. Introduction
Warner Electric BBCs are typically used to
control the rotation of the cutting blade(s)
on walk-behind mowers. These machines
are generally designed with a means to
automatically stop the blade(s) when the
operator releases an operator presence control.
(See Note 1) Warner Electric BBCs help
accomplish this design goal by providing a
means to remove engine power from the blades
and braking the blades to a stop while at the
same time allowing the engine to continue to
run.
Warner Electric BBCs provide superior operator
convenience to "engine-kill" systems in which
the blade(s) and engine both stop when the
operator releases the operator presence control.
With this system the operator must restart the
engine each time he/she leaves the operator
zone to perform such common tasks as clearing
debris from the lawn or emptying the grass
catcher.
Note 1: Reference applicable International and
U.S. Standards such as ISO-5395, EN-836,
CPSC # --- and ANSI/OPEI B71.1.
III. Operation
The clutch is engaged by actuating the
operator presence lever and pushing the blade
engagement handle. This action rotates the ball
ramp mechanism, causing three small internal
springs inside of the clutch/brake to lift the
brake plate clear of the friction disc. As the
brake plate is released from the friction disc, a
heavy coil spring at the base of the unit pushes
the friction disc against the rotating input hub,
which is bolted to the engine's crankshaft. The
clutch is then engaged and the blade rotates.
Releasing the operator presence lever causes
the spring to rotate the ball ramp mechanism in
the opposite direction which forces the brake
plate against the outer portion of the friction
disc, releasing the clutch and braking the blade
to a stop.
Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Design Considerations . . . . . . . . . . . . . . . . . . . 3
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Performing Maintenance on the Warner
Electric BBC . . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting the Warner Electric
BBC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Warranty . . . . . . . . . . . . . . . . . . . . . . Back Page
Failure to follow these
instructions may result in product
damage, equipment damage, and
serious or fatal injury to personnel.
When performing maintenance on either
mowing deck or engine, the engine should be
stopped and the spark plug wire should be
disconnected.
I. Scope
This manual has been prepared by Warner
Electric to assist manufacturers of outdoor
power equipment in the selection, installation,
operation, and troubleshooting of Warner Electric
Blade Brake Clutches (BBCs). The information
contained in this publication is to be considered
a general guideline for incorporation of BBCs
into outdoor power equipment such as
walk-behind and ride-on mowers. As each
application is unique, the suitability of a BBC for
use in a particular machine can only be
determined through appropriate testing.