Cub Cadet 8454 Service Manual page 157

B. OPERATION OF THE REAR AXLE
The final reduction system has a planetary gear system.
It is compact, and is durable under heavy loads since
torque loads are spread over three gears, decreasing
the load on each tooth. And this system also spreads
the load evenly around the circumference of the system,
eliminating the sideways stress on the shafts. Power,
transmitted from the differential side gear (6) to the
brake shaft (4), drives the three planetary gears (3).
Since the internal gear (2) is fixed to the rear axle case,
the planetary gears (3) move around the teeth of the
internal gear (2) while rotating on their axes. The move-
ment of the planetary gears around the internal gear is
transmitted to the rear axle (5) through the planetary
gear support (1). As a result, the planetary gear sup-
port (1) and rear axle (5) rotate in the same direction as
the brake shaft (4), but at a reduced speed and in-
creased torque.
D569-W02 May-2003
K&T Saw Shop 606-678-9623 or 606-561-4983
www.mymowerparts.com
TRANSMISSION SYSTEM
(1) Planetary Gear Support
(2) Internal Gear
(3) Planetary Gear
(4) Brake Shaft (13 Gear Shaft)
(5) Rear Axle
(6) Differential Side Gear
569W487A
569W488A
4-53