SECTION 8
FINAL DRIVE
Consequently, the small planet carrier (E) (non-
8-1. GENERAL.
stationary) walks around the ring gear (D). Planet carrier
(E) is splined to and drives a second sun gear (F) which
8-2. This section contains a description of the final drive
rotates in the same direction as, but independently of,
operation and overhaul instructions for components of
sun gear (B). Sun gear (F) then drives the larger
the drive drum assembly. Overhaul instructions include
planetary gear set (G) which is capable of turning the
removal, dis- assemly, inspection, reassembly and
ring gear (D) and the drive drum. (Ring gear (D) is
installa- tion of all components of the final drive
attached to the drum.) The second larger planet carrier
assembly. Design specifications are given in Section 2.
(H) is bolted to the frame, and provides the reaction
Troubleshooting instructions are given in Section 5.
necessary to drive the drum.
8-6. REMOVAL AND DISASSEMBLY OF FINAL
DRIVE ASSEMBLY.
8-4. C350B FINAL DRIVE DESCRIPTION ( see
figure 8-2).
a. Drain the lubricant (refer to Section 4).
8-5. The final drive consists of an internal, double
reduction planetary system located within the left side of
NOTE: Inspect the lubricant for foreign particles. Keep
the single drive drum (see figure 8-1). Torque is
samples for failure analysis.
transferred from the hydraulic motor (across the drum)
to the planetary system by the drive shaft (A). A sun
b. Block the guide rolls front and rear.
gear (B) Is splined to this shaft and drives the smaller of
the two planetary gear sets (C) in the opposite direction.
WARNING : Do not depend on the parking brake to
This gear set (C), in turn, attempts to turn the ring gear
prevent the unit from moving. The brake
(D) (bolted directly to the drive drum) in the same
assembly will be removed prior to the
direction gear set (C) is traveling, but does not possess
removal of the drive drum.
the mechanical advantage to do so.
c. Jack up both sides of the frame so that the weight
of the frame is on the jacks and not the drive drum.
d. Remove the scraper bar and bumper assembly
mounting capscrews and lift off the assembly.
e. Complete the DRIVE DRUM removal procedure
presented in Section 7, paragraph 7-1 98.
f. Remove the capscrews in the drum hub. Pull the
hub using the puller holes provided and appropriate
puller bolts. jnstall two dowl (guide) pins (see figure 8-3).
WARNING : Connect the drum hub to a hoist prior to
complete removal from the drive drum. The outer
planetary assembly will accompany the drum hub upon
removal. Care should be taken when handling these
components.
g. Remove the inner planetary assembly (see figure 8-
4).
h. Remove the brake shaft snap ring. Then pull the
FIGURE 8-2.
inner sun gear, small thrust washers
8-2.
