Warner Electric Blade Brake Clutch Application Guide - Manual (Page 6)

6 Warner Electric • 800-825-9050 P-1319-WE • 819-0465
If engine oil is spilled onto the BBC, the BBC
will not perform properly. The blade
engagement time as well as the blade stop
time may be severely increased. If engine oil
is spilled on the BBC, it should be replaced.
H. Operating Temperature
Warner Electric's BBC is designed to operate in
environments where the top plate bearing
temperature does not exceed 250° F (121°C).
We strongly recommend that the top plate bearing
temperature be monitored during testing and any
readings over 220° F (104°C) be reported to
Warner Electric.
I. Torque Capacity
The BBC must have adequate clutch torque
capacity to stall the engine in the event that the
deck becomes blocked. The BBC is available with
three different clutch springs for static torque
capacities of 100, 144, and 160 in.lbs. (11.3,16.3,
& 18 NM). The BBC is generally applicable
through 6 hp engines, however the torque output
of engines can vary widely.
Warner Electric strongly recommends that during
testing the stall capacity of the BBC be checked.
Blocking the blade with a wooden board and
repeatedly engaging the BBC against the blocked
blade can easily accomplish this. We recommend
the BBC should be capable of stalling the engine
five consecutive times over a two-minute period.
However, the mower manufacturer should
establish the minimum number of times the
BBC should be capable of stalling the engine
based on the anticipated consumer usage. It is
recommended that the stall testing be conducted
immediately after the mower has run for at least
one half hour and the BBC cycled at least 20
times.
J. Shrouds
Warner Electric recommends that the BBC not
be enclosed in a shroud. Historically, shrouds
have tended to trap grass clippings, debris and
moisture around the BBC rather than protecting
the BBC from contamination.
K. Blade Design
It is important that the mower blade be designed
so that its natural frequency is above 60Hertz
given a maximum engine speed of 3600 rpm.
Failure to do so can result in very high blade
deflections when the blade is stationary and the
engine is running. The mower manufacturer
should test for blade deflection over the entire
engine speed range.
L. Deck Maintenance
Warner Electric strongly suggests that
customers “
DO NOT” use a pressure washer
to clear the underside of the deck.
M. Engine Inertia
In some cases when using "engine kill" type
operator presence controls, the engine
manufacturers use the blade inertia as portion
of the flywheel effect needed to start the engine.
When using the BBC, the blade does not rotate
when starting the engine. Some engines will
require that a heavier flywheel be specified when
using the BBC. Please consult with the engine
manufacturer when specifying an engine that will
be used with a BBC equipped mower.