Theory of Operation
The third planet sun gear rotate the third planet gears
Rotary motion is transferred from the input shaft to the
(O). The third planet carrier (E) is fixed to the housing
sprocket (P) by the three planetary gear sets that
(R) and does not rotate so the rotation of the third
mesh with the ring gear (D). As the input shaft is
planet gears is transferred to the ring gear. Because
rotated it turns the first planet gears (M). The gears
the ring gear and sprocket (P) are fasten to the drum
rotate against the ring gear causing the first planet
(Q) they all rotate together driving the track chain to
carrier (I) to rotate. The first planet carrier is connected
move the machine.
to the second planet sun gear (H) which is in mesh
with and rotates the second planet gears (N). As the
A replaceable thrust pad (K) is used in the cover (L) to
second planet gears rotate against the ring gear they
hold the input shaft in position.
turn the second planet carrier (G). The second planet
carrier is connected to the third planet sun gear (F).