Theory of Operation
planet sun gear is located between thrust washers.
The swing gearbox (N) is a double reduction planetary
Second planet gears (C) rotate around shafts in the
drive type gearbox. The swing motor (A) is mounted
second planet carrier (I). The second planet carrier is
on the swing gearbox and encloses the top side of
connected to the output pinion (G) and this causes the
gearbox. The output pinion (G) is in mesh with swing
output pinion to rotate.
gear. Swing motor rotational speed is reduced by the
double reduction planetary gear set.
The pinion rotates in two spherical roller bearings (D
and H). Downward movement of pinion is prevented by
The first planet sun gear (L) is connected to motor
a retaining ring seated against upper bearing. Upward
output shaft and is located between a retaining ring
movement is prevented by second sun pinion. Oil seal
and thrust washer. The first planet gears (B) rotate
(F) prevents oil from leaking out of swing gearbox and
around roller bearings on shafts in the first planet
keeps grease from coming in.
carrier (M). Rotation of the first planet carrier causes
the second planet sun gear (J) to rotate. The second