Dodge dakota 2002 Service Manual page 2526

DR
TRANSFER CASE - NV273
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 687
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 688
DIAGNOSIS AND TESTING - TRANSFER
CASE - NV273 . . . . . . . . . . . . . . . . . . . . . . . 688
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 689
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . 689
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . 698
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . 699
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 701
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 713
SPECIFICATIONS
TRANSFER CASE - NV273
SPECIAL TOOLS
TRANSFER CASE NV271/NV273
EXTENSION HOUSING SEAL AND DUST BOOT
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 716
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 716
TRANSFER CASE - NV273
DESCRIPTION
The NV273 is an electronically controlled part-time
transfer case with a low range gear reduction system.
The NV273 has three operating ranges plus a NEU-
TRAL position. The low range system provides a gear
reduction ratio for increased low speed torque capa-
bility.
The geartrain is mounted in two aluminum case
halves attached with bolts. The mainshaft front and
rear bearings are mounted in aluminum case halves.
OPERATING RANGES
Transfer case operating ranges are:
• 2WD (2-wheel drive)
• 4HI (4-wheel drive)
• 4LO (4-wheel drive low range)
• NEUTRAL
The 2WD range is for use on any road surface at
any time.
TRANSFER CASE - NV273
TABLE OF CONTENTS
page
. . . . . . . . . . . . . 713
. . . . . . . . . 714
TRANSFER CASE - NV273
FLUID
STANDARD PROCEDURE - FLUID DRAIN AND
REFILL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 716
FRONT OUTPUT SHAFT SEAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 717
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 717
MODE SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 718
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 718
SELECTOR SWITCH
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 719
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 719
SHIFT MOTOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 720
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 720
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . 720
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 720
The 4HI and 4LO ranges are for off road use only.
They are not for use on hard surface roads. The only
exception being when the road surface is wet or slip-
pery or covered by ice and snow.
The low range reduction gear system is operative
in 4LO range only. This range is for extra pulling
power in off road situations. Low range reduction
ratio is 2.72:1.
SHIFT MECHANISM
Operating ranges
mounted shift selector switch. The shift selector
switch provides a input to the Transfer Case Control
Module (TCCM) to indicate the driver's desire to
change operating ranges. The TCCM uses this input,
along with input from the transfer case mounted
mode sensor and information from the vehicle's bus,
to determine if a shift is permitted. If the TCCM
decides the shift is permitted, the TCCM controls the
shift motor, mounted to the exterior of the transfer
case, to perform the shift.
21 - 687
are selected with
page
a dash