Jeep 2002 WJ - PLANETARY GEARTRAIN

PLANETARY GEARTRAIN
DESCRIPTION
Three planetary gear sets (Fig. 149) are used to
produce the different gear ratios. These are located
in the mechanical part of the transmission as the
front, middle and rear planetary gear sets.
OPERATION
The annulus gear (1) (Fig. 150) and sun gear (3)
elements of a planetary gear system are alternately
driven and braked by the actuating elements of the
multi-plate clutch and multiple-disc brake. The plan-
etary pinion gears (2) can turn on the internal gear-
ing of the annulus gear (1) and on the external
gearing of the sun gear (3). This allows for a variety
of gear ratios and the reversal of the rotation direc-
tion without the need for moving gear wheels or shift
collars. When two components of the planetary gear
set are locked together, the planetary gear set is
locked and turns as a closed unit.
The torque and engine speed are converted accord-
ing to the lever ratios and the ratio of the number of
teeth on the driven gears to that on the drive gears,
and is referred to as the gear ratio. The overall ratio
of a number of planetary gear sets connected in
series is obtained by multiplying the partial ratios.
DISASSEMBLY
(1) Remove upper two visible Teflon rings (1) (Fig.
151) from output shaft.
(2) Remove retaining ring (11), shim (10), thrust
needle bearing (9) and thrust washer (8) from output
shaft.
(3) Remove clutch K3 (7).
(4) Remove rear tubular shaft/freewheeling clutch
F2 (6) (Fig. 151) from output shaft.
(5) Remove rear gear set (5) with integrated tubu-
lar shaft of center gear set from output shaft.
(6) Remove thrust washer (4).
ASSEMBLY
(1) Mount thrust washer (4) (Fig. 152) with the
collar pointing towards the planet carrier.
(2) Mount rear gear set (5) with integrated tubular
shaft of the center gear set on output shaft.
(3) Using grease, install lower three Teflon rings
(1) (Fig. 152) in the groove so that the joint stays
together
(4) Put rear tubular shaft/freewheeling clutch F2
(6) onto output shaft.
(5) Install clutch K3 (7).
(6) Mount retaining ring, shim, thrust needle bear-
ing and thrust washer (8 - 11) (Fig. 152).
(7) Using grease, insert the upper two Teflon rings
(1) in the groove so that the joint remains together.
Fig. 149 Planetary Geartrain
1 - ANNULUS GEAR
2 - PLANETARY PINION GEARS
3 - SUN GEAR
4 - PLANETARY CARRIER
Fig. 150 Planetary Geartrain
1 - ANNULUS GEAR
2 - PLANETARY PINION GEARS
3 - SUN GEAR
4 - PLANETARY CARRIER
WG TRANSMISSION AND TRANSFER CASE 21a - 101