Jeep Wrangler TJ. Manual — part 487
SHIFT MECHANISM
. . . . . . . . . . . . . . . . . . . . . . . . 136
. . . . . . . . . . . . . . . . . . . . . . . . . . 136
. . . . . . . . . . . . . . . . . . . . . . . . 136
SOLENOID
. . . . . . . . . . . . . . . . . . . . . . . . 137
. . . . . . . . . . . . . . . . . . . . . . . . . . 138
SOLENOID/PRESSURE SWITCH ASSY
. . . . . . . . . . . . . . . . . . . . . . . . 138
. . . . . . . . . . . . . . . . . . . . . . . . . . 139
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
. . . . . . . . . . . . . . . . . . . . . . . . 140
TORQUE CONVERTER
. . . . . . . . . . . . . . . . . . . . . . . . 141
. . . . . . . . . . . . . . . . . . . . . . . . . . 145
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
. . . . . . . . . . . . . . . . . . . . . . . . 146
TRANSMISSION CONTROL RELAY
. . . . . . . . . . . . . . . . . . . . . . . . 146
. . . . . . . . . . . . . . . . . . . . . . . . . . 147
TRANSMISSION RANGE SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . 147
. . . . . . . . . . . . . . . . . . . . . . . . . . 147
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
. . . . . . . . . . . . . . . . . . . . . . . . 148
TRANSMISSION TEMPERATURE SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . 149
. . . . . . . . . . . . . . . . . . . . . . . . . . 149
VALVE BODY
. . . . . . . . . . . . . . . . . . . . . . . . 149
. . . . . . . . . . . . . . . . . . . . . . . . . . 150
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
. . . . . . . . . . . . . . . . . . . . . . . . 154
. . . . . . . . . . . . . . . . . . . . . . . . . . . 159
. . . . . . . . . . . . . . . . . . . . . . . . 164
AUTOMATIC TRANSMISSION -
42RLE
DESCRIPTION
The 42RLE (Fig. 1) is a four-speed transmission
that is a conventional hydraulic/mechanical assembly
controlled with adaptive electronic controls and mon-
itors. The hydraulic system of the transmission con-
sists
of
the
transmission
fluid,
fluid
passages,
hydraulic valves, and various line pressure control
components. An input clutch assembly which houses
the underdrive, overdrive, and reverse clutches is
used. It also utilizes separate holding clutches: 2nd/
4th gear and Low/Reverse. The primary mechanical
components of the transmission consist of the follow-
ing:
• Three multiple disc input clutches
• Two multiple disc holding clutches
• Four hydraulic accumulators
• Two planetary gear sets
• Hydraulic oil pump
• Valve body
• Solenoid/Pressure switch assembly
Control of the transmission is accomplished by
fully adaptive electronics. Optimum shift scheduling
is accomplished through continuous real-time sensor
feedback information provided to the Transmission
Control Module (TCM) portion of the Powertrain
Control Module (PCM).
The TCM is the heart of the electronic control sys-
tem and relies on information from various direct
and indirect inputs (sensors, switches, etc.) to deter-
mine driver demand and vehicle operating condi-
tions. With this information, the TCM can calculate
and perform timely and quality shifts through vari-
ous output or control devices (solenoid pack, trans-
mission control relay, etc.).
The TCM also performs certain self-diagnostic
functions and provides comprehensive information
(sensor data, DTC’s, etc.) which is helpful in proper
diagnosis and repair. This information can be viewed
with the DRB
t scan tool.
21 - 38
AUTOMATIC TRANSMISSION - 42RLE
TJ
Fig.
1
42RLE
Automatic
T
ransmission
TJ
AUTOMATIC TRANSMISSION - 42RLE
21 - 39
AUTOMATIC TRANSMISSION - 42RLE (Continued)
TRANSMISSION IDENTIFICATION
The 42RLE transmission can be identified by a
barcode label that is affixed to the upper left area of
the bellhousing.
The label contains a series of digits that can be
translated into useful information such as transmis-
sion part number (10), date of manufacture (4, 5),
manufacturing origin (2), assembly line identifier (6),
build sequence number (7), etc. (Fig. 2).
If the tag is not legible or is missing, the “PK”
number, which is stamped into the left rear flange of
the transmission case, can be referred to for identifi-
cation. The entire part number, build code, and
sequence number are stamped into the flange.
OPERATION
The 42RLE transmission ratios are:
First
2.84 : 1
Second
1.57 : 1
Third
1.00 : 1
Overdrive
0.69 : 1
Reverse
2.21 : 1
1 - DRIVEPLATE
6 - REVERSE CLUTCH
11 - STUB SHAFT
2 - TORQUE CONVERTER
7 - FRONT PLANET CARRIER
12 - LOW/REVERSE CLUTCH
3 - INPUT SHAFT
8 - REAR PLANET CARRIER
13 - 2/4 CLUTCH
4 - UNDERDRIVE CLUTCH
9 - OUTPUT SHAFT
14 - OIL PUMP
5 - OVERDRIVE CLUTCH
10 - SNAP RING
Fig. 2 Identification Label Breakdown
1 - T=TRACEABILITY
2 - SUPPLIER CODE (PK=KOKOMO)
3 - COMPONENT CODE (TK=KOKOMO TRANSMISSION)
4 - BUILD DAY (350=DEC. 15)
5 - BUILD YEAR (1=2001)
6 - ASSEMBLY LINE CODE
7 - BUILD SEQUENCE NUMBER
8 - LAST THREE OF P/N
9 - CHANGE LEVEL
10 - TRANSMISSION PART NUMBER
11 - P=PART NUMBER
21 - 40
AUTOMATIC TRANSMISSION - 42RLE
TJ
AUTOMATIC TRANSMISSION - 42RLE (Continued)
FIRST GEAR POWERFLOW
In first gear range, torque input is through the
underdrive clutch (1) (Fig. 3) to the underdrive hub
assembly. The underdrive hub is splined to the rear
sun gear. When the underdrive clutch is applied, it
rotates the underdrive hub and rear sun gear. The
L/R clutch (2) is applied to hold the front carrier/rear
annulus assembly. The rear sun gear drives the rear
planetary pinion gears. The rear planetary pinion
gears are forced to walk around the inside of the sta-
tionary rear annulus gear. The pinions are pinned to
the rear carrier and cause the rear carrier assembly
to rotate as they walk around the annulus gear. This
provides the torque output for first gear. The other
planetary gearset components are freewheeling. The
first gear ratio is 2.84:1.
Fig. 3 First Gear Powerflow
1 - UNDERDRIVE CLUTCH APPLIED (Turns Rear Sun)
2 - LOW-REVERSE CLUTCH APPLIED (Holds Rear Annulus/Front
Carrier)
TJ
AUTOMATIC TRANSMISSION - 42RLE
21 - 41
AUTOMATIC TRANSMISSION - 42RLE (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст