Dodge Durango (DN). Manual — part 137
Seal Installer—8254
Installer—8255
Support Stand—8257
Pressure Tap Adapter—8258
Line Pressure Adapter—8259
Input Clutch Pressure Fixture—8260
21 - 414
45RFE AUTOMATIC TRANSMISSION
DN
SPECIAL TOOLS (Continued)
Alignment Plate—8261
End Play Set—8266
Spring Compressor—8285
Bearing Installer—8320
Filter Wrench—8321
Piston Installer—8504
DN
45RFE AUTOMATIC TRANSMISSION
21 - 415
SPECIAL TOOLS (Continued)
NV231 TRANSFER CASE
TABLE OF CONTENTS
page
page
DESCRIPTION AND OPERATION
NV231 TRANSFER CASE. . . . . . . . . . . . . . . . . . 416
LUBRICANT AND FILL LEVEL . . . . . . . . . . . . . . 417
DIAGNOSIS AND TESTING
NV231 DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . 417
REMOVAL AND INSTALLATION
TRANSFER CASE . . . . . . . . . . . . . . . . . . . . . . . 418
TRANSFER CASE SHIFTER. . . . . . . . . . . . . . . . 419
FRONT OUTPUT SHAFT SEAL . . . . . . . . . . . . . 419
REAR RETAINER BUSHING AND SEAL . . . . . . . 419
DISASSEMBLY AND ASSEMBLY
NV231 TRANSFER CASE. . . . . . . . . . . . . . . . . . 420
CLEANING AND INSPECTION
NV231 TRANSFER CASE. . . . . . . . . . . . . . . . . . 437
ADJUSTMENTS
SHIFTER ADJUSTMENT. . . . . . . . . . . . . . . . . . . 440
SPECIFICATIONS
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440
SPECIAL TOOLS
NV231 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
DESCRIPTION AND OPERATION
NV231 TRANSFER CASE
DESCRIPTION
The NV231 is a part-time transfer case with a low
range reduction gear system. The NV231 has three
operating ranges plus a Neutral position. A low range
system provides a reduction ratio for increased low
speed torque capability.
The geartrain is mounted in two aluminum case
halves attached with bolts. The mainshaft front and
rear bearings are mounted in aluminum retainer
housings bolted to the case halves.
OPERATING RANGES
Transfer case operating ranges are:
• 2WD (2-wheel drive)
• 4HI LOCK (4-wheel drive)
• 4LO LOCK (4-wheel drive low range
The 2WD range is for use on any road surface at
any time.
The 4HI LOCK and 4LO LOCK ranges are for off
road use only. They are not for use on hard surface
roads. The only exception being when the road sur-
face is wet or slippery or covered by ice and snow.
The low range reduction gear system is operative
in 4LO LOCK 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
are
selected
with
a
body
mounted shift lever. The shift lever is connected to
the transfer case range lever by an adjustable link-
age rod. A straight line shift pattern is used. Range
positions are marked on the shifter bezel cover plate.
IDENTIFICATION
A circular ID tag is attached to the rear case of
each transfer case (Fig. 1). The ID tag provides the
transfer case model number, assembly number, serial
number, and low range ratio.
The transfer case serial number also represents
the date of build.
OPERATION
The input gear is splined to the transmission out-
put shaft. The input gear drives the mainshaft
through the planetary assembly and range hub. The
front output shaft is operated by a drive chain that
connects the shaft to a drive sprocket on the main-
shaft. The drive sprocket is engaged/disengaged by
the mode fork, which operates the mode sleeve and
Fig. 1 Fill/Drain Plug And I.D. Tag Locations
1 – I.D. TAG
2 – FILL PLUG
3 – DRAIN PLUG
21 - 416
NV231 TRANSFER CASE
DN
hub. The sleeve and hub are not equipped with a
synchronizer mechanism for shifting.
LUBRICANT AND FILL LEVEL
DESCRIPTION
Recommended lubricant for the NV231 transfer
case is Mopar
t Dexron III, or ATF+3, type 7176.
Approximate lubricant fill capacity is 1.2 liters (2.5
pints).
The fill and drain plugs are both in the rear case
(Fig. 2). Correct fill level is to the bottom edge of the
fill plug hole. Be sure the vehicle is level to ensure
an accurate fluid level check.
DIAGNOSIS AND TESTING
NV231 DIAGNOSIS
DIAGNOSIS CHART
Condition
Possible Cause
Correction
Transfer case difficult to shift or will
not shift into desired range.
1) Vehicle speed to great to permit
shifting.
1) Slow vehicle and shift into
desired range.
2) If vehicle was operated for an
extended period in 4HI LOCK mode
on dry surface, driveline torque load
may cause difficulty.
2) Stop vehicle and shift transfer
case to Neutral position. Transfer
case can then be shifted to the
desired mode.
3) Transfer case shift linkage
binding.
3) Repair or replace linkage as
necessary.
4) Insufficient or incorrect lubricant.
4) Drain and refill transfer case with
the correct quantity of Mopar
T
DexronIII or ATF+3, type 7176,
Automatic transmission fluid.
5) Internal transfer case
components binding, worn, or
damaged.
5) Repair or replace components as
necessary.
Transfer case noisy in all drive
modes.
1) Insufficient or incorrect lubricant.
1) Drain and refill transfer case with
the correct quantity of Mopar
T
DexronIII or ATF+3, type 7176,
Automatic transmission
fluid.lubricant.
Fig. 2 Fill/Drain Plug Locations
1 – I.D. TAG
2 – FILL PLUG
3 – DRAIN PLUG
DN
NV231 TRANSFER CASE
21 - 417
DESCRIPTION AND OPERATION (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст