MCi Crusader II 1989 Maintenance Manual page 194

Date
1-1-89 · Page
5-12
MC-9 MAINTENANCE MANUAL
TORQUE-LIMITING CLUTCH BRAKE
The torque-limiting clutch brake (figure 5-36) helps lengthen
the life of the transmission by aiding in smooth gear engage-
ment atthose times when the transmission gears may still be in
motion even though the coach is stopped. Examples of this
situation are (1) stopping at a traffic signal and immediately
starting up again or (2) when shifting from first to reverse or
from reverse to first gear.
The torque-limiting feature is provided by internal spring
washers which are driven by a hub. The spring washers react
against the clutch brake covers with facing material positi-
oned between each spring washer and cover. The hub and
spring washer combination slips with respect to the covers
after approximately a 25 ft. lb. load has been exceeded.
Longer tang life is provided by the brake's ability to limit
torsionally induced damage. Also, 5° of free play is provided
between the hub and spring washers so that the inertia of the
spring washers cannot load the hub directly. Inertia present in
the covers is allowed to load the hub only up to the 25 to 30 ft
lb. load mentioned above. And. the tangs themselves are
thicker to absorb what remaining torsionals do find their way
to the hub.
Figure 5-36. Clutch Brake.
Th ere is no extra work on the driver's part to activate the brake.
Depressing the clutch pedal to the floorboard, beyond thpe
normal clutch disengage position, causes the clutch release
bearing to come in contact with the clutch brake. Because the
brake is splined to the transmission main drive gear (figure
5-37). the transmission is slowed down or stopped. The driver
can then shift from first to reverse or from reverse to first
without clashing or putting undue strain on the gears.
Figure 5-37. Clutch Brake Installed.
INST ALLA Tl ON
Install clutch brake before installing the transmission.
When used with Fuller Transmission equipped with stand-
ard bearing cap, clutch brake should be mounted with large
facing diameter toward.transmission.
ADJUSTMENT
Clutch brake adjustment can be found in earlier pages of
this section as part of the clutch adjustment procedure.