SRA417
9. Spread cotter pin.
10. Install hub cap.
Preload Adjustment (4WD models)
NGAX0006S02
Adjust wheel bearing preload after wheel bearing has been
replaced or front axle has been reassembled.
Adjust wheel bearing preload as follows:
1. Before adjustment, thoroughly clean all parts to prevent dirt
entry.
SFA891-C
2. Apply multi-purpose grease sparingly to the following parts:
¼ Threaded portion of spindle
¼ Contact surface between wheel bearing washer and outer
wheel bearing
¼ Grease seal lip
¼ Wheel hub (as shown at left) 18 - 23 g (0.63 - 0.81 oz)
AFA148
3. Tighten wheel bearing lock nut with Tool.
:78-98N·m (8 - 10 kg-m, 58 - 72 ft-lb)
4. Turn wheel hub several times in both directions.
5. Loosen wheel bearing lock nut so that torque becomes 0 N·m
(0 kg-m, 0 ft-lb).
6. Retighten wheel bearing lock nut with Tool.
: 0.5 - 1.5 N·m (0.05 - 0.15 kg-m, 4.3 - 13.0 in-lb)
SFA845B
7. Turn wheel hub several times in both directions.
8. Retighten wheel bearing lock nut with Tool.
: 0.5 - 1.5 N·m (0.05 - 0.15 kg-m, 4.3 - 13.0 in-lb)
9. Measure wheel bearing axial end play.
Axial end play: 0 mm (0 in)
SMA580A
10. Measure starting force “A” at wheel hub bolt.
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FRONT AXLE
On-vehicle Service (Cont’d)
AX-5
SFA830
11. Install lock washer by tightening the lock nut within 15 to 30
degrees.
12. Turn wheel hub several times in both directions to seat wheel
bearing correctly.
13. Measure starting force “B” at wheel hub bolt. Refer to step 10.
14. Wheel bearing preload “C” can be calculated as shown below.
C=B−A
Wheel bearing preload “C”:
7.06 - 20.99 N (0.72 - 2.14 kg, 1.59 - 4.72 lb)
15. Repeat steps 3 through 14 until correct axial end play and
wheel bearing preload are obtained.
16. Tighten screws.
: 1.2 - 1.8 N·m (0.12 - 0.18 kg-m, 10.4 - 15.6 in-lb)
17. Install free-running hub.
SFA901
DRIVE SHAFT
NGAX0007
¼ Check for grease leakage and damage.
FRONT AXLE
On-vehicle Service (Cont’d)
AX-6
Components
NGAX0008
AAX005
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FRONT AXLE
Components
AX-7
AAX006
FRONT AXLE
Components (Cont’d)
AX-8
Auto-lock Free-running Hub
DESCRIPTION
NGAX0038
Auto-lock free-running hubs are locked by placing the transfer case
into the 4WD mode and moving the vehicle. They are unlocked by
placing the transfer case into 2WD mode and moving the vehicle
in reverse gear in a straight line for at least 2–3 meters (7–10
feet).
In most cases, the “ratcheting” noise sometimes heard in auto-lock
free-running hubs occurs when one hub is locked and the opposite
hub is unlocked. The noise is heard in the side opposite to the
locked hub. For example, if the noise is heard at the left front wheel,
the right front hub is still locked and is not unlocking. This condi-
tion may be caused by a mechanical condition in one of the hubs
or by incorrect operation on the part of the vehicle driver, for
example by not backing up in a straight line to unlock the hubs, by
not backing up enough, or by shifting into 4WD at too high a vehicle
speed, etc.
The ratcheting noise does not necessarily cause damage to the
good hub. If the noise is caused by incorrect operation, counsel the
driver of the vehicle. If replacement is necessary, replace only the
defective parts. It is not necessary to replace auto-lock free-running
hubs in pairs.
Use the trouble diagnosis chart to isolate the cause of the noise.
Refer to “TROUBLE DIAGNOSIS FOR NOISE”, AX-10.
REMOVAL AND INSTALLATION
NGAX0011
AAX008
SFA828B
1. Set auto-lock free-running hub in the FREE position.
2. Remove auto-lock free-running hub assembly.
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Auto-lock Free-running Hub
AX-9
AFA143
3. Remove snap ring.
4. Remove spindle washer and fixed cam assembly.
5. Install fixed cam assembly.
Be sure to align the tabs of the fixed cam assembly to the
notches of the knuckle.
6. Place the spindle washer and then the snap ring over the axle
shaft and position them between the 2 locking grooves.
7. While supporting the axle shaft behind the knuckle, use an
appropriate sized deep socket to securely seat the snap ring
into the inner locking groove.
CAUTION:
Visually verify that the snap ring is fully seated into the lock-
ing groove.
8. After installing auto-lock free-running hub, check operation.
During installation, apply recommended grease to the parts
shown in the above illustration.
INSPECTION
NGAX0039
1. Check axle axial end play. Refer to “INSTALLATION”, AX-19.
2. Inspect fixed cam (thrust washer) assembly. If this part shows
evidence of galling or heat damage—usually caused by too
little axle axial end play—replace as necessary. Check axle
axial end play if this part is replaced. Refer to
“INSTALLATION”, AX-19.
3. Inspect hub assembly. Hold inner splines with a finger and spin
the outer body. If the hub shows signs of damage, or if there
is excessive metallic clicking when the hub is spun, replace
with a new one.
NOTE:
New hubs are greased during manufacture. No additional grease
is required.
New hubs are supplied with fixed cam assemblies
CAUTION:
Any hub, the original or a new one, should go onto the axle
freely by hand and fit flush against its seat. If it does not fit
flush, do not pull the hub into place by tightening the bolts.
The hub is possibly misaligned inside and tightening the bolts
will cause damage. Remove the hub and turn to align correctly
before continuing.
4. Once repair is complete, test drive to check for correct opera-
tion and the absence of noise.
TROUBLE DIAGNOSIS FOR NOISE
NGAX0040
Symptom Possible cause Repair order
Ratchet noise in hub after shifting the transfer
case into 4WD at speeds higher than 40 km/h
(25 mph).
1. Shifting into 4WD at higher
speeds is difficult and may
cause damage to transfer case
1. Stop the vehicle or decrease speed to
less than 40 km/h (25 mph). Return
the transfer case lever to the 2H posi-
tion once, then re-shift to the 4H posi-
tion. Move forward until the hubs lock.
Ratchet noise in hub after shifting or attempting
to shift the transfer case into 4WD at speeds
less than 40 km/h (25 mph).
1. Transfer case was not fully
engaged or shifting was stopped
halfway so that only one hub
locked
1. Make sure the 4WD lamp on the dash
is ″ON″ when shifting into 4WD. Slow
or stop the vehicle. Shift into 2H, then
back to 4H. Move forward until the
hubs lock.
Ratchet noise in hub after shifting the transfer
case into 4WD on snowy or muddy roads or on
slopes.
1. If the rear wheels slip during the
hub locking operation, noise can
occur in the hubs
1. Reduce engine speed and drive for-
ward slowly. The hubs will lock evenly
and the noise will stop.
FRONT AXLE
Auto-lock Free-running Hub (Cont’d)
AX-10
Symptom Possible cause Repair order
Ratchet noise in hub after shifting the transfer
case into 2WD and backing up to unlock the
hubs.
1. The hubs may not be fully
released
1. Stop the vehicle, make sure the trans-
fer case lever is fully in the 2H
position, then back up slowly in a
straight line at least 2-3 meters (7-10
feet).
Ratchet noise in hub when driving in extremely
cold weather.
1. The viscosity of differential oil
grows higher in extreme cold,
increasing the possibility that
one hub may lock. A lower vis-
cosity differential fluid may be
required for extreme cold tem-
peratures. See owner’s manual
1. Shift the transfer case into 4H and
drive the vehicle for 10 minutes or
more to warm the differential oil. Then
shift to 2WD and back up in a straight
line for at least 2-3 meters (7-10 feet)
to disengage the hubs.
Continual ratchet noise in one wheel when mov-
ing forward.
1. A hub may be mechanically
locked either by damage or
misinstallation
1. Remove hubs and inspect. Refer to
“INSPECTION”, AX-10. Pay special
attention to the hub opposite the noisy
side. The ratcheting does not neces-
sarily cause damage to the good hub.
SFA825B
Wheel Hub and Rotor Disc
REMOVAL AND INSTALLATION
NGAX0012
1. Remove free-running hub assembly (4WD models).
Refer to “Auto-lock Free-running Hub”, AX-9.
2. Remove brake caliper assembly without disconnecting hydrau-
lic line.
Be careful not to depress brake pedal, or piston will pop out.
Make sure brake hose is not twisted.
SFA364BB
3. Remove lock washer (4WD models).
AFA141
4. Remove wheel bearing lock nut.
2WD: With suitable tool
4WD: With Tool
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FRONT AXLE
Auto-lock Free-running Hub (Cont’d)
AX-11
SFA827B
5. Remove wheel hub and wheel bearing.
Be careful not to drop outer bearing.
6. After installing wheel hub and wheel bearing, adjust wheel
bearing preload.
Refer to “Preload Adjustment (2WD models)” and “Preload
Adjustment (4WD models)”, “FRONT WHEEL BEARING”, “On-
vehicle Service”, AX-4, 5.
FA858
DISASSEMBLY
NGAX0013
¼ Remove bearing outer races with suitable brass bar.
INSPECTION
NGAX0014
Thoroughly clean wheel bearings and wheel hub.
Wheel Bearings
NGAX0014S01
¼ Make sure wheel bearings roll freely and are free from noise,
cracks, pitting and wear.
Wheel Hub
NGAX0014S02
¼ Check wheel hub for cracks by using a magnetic exploration
or dyeing test.
AFA156
ASSEMBLY
NGAX0015
1. Install bearing outer race with Tool until it seats in hub.
SBR400DA
2. Install the sensor rotor using suitable drift and press.
Always replace sensor rotor with new one.
Pay attention to the direction of front sensor rotor as shown in
figure.
FRONT AXLE
Wheel Hub and Rotor Disc (Cont’d)
AX-12
AFA122
3. Pack multi-purpose grease in wheel hub and hub cap.
SFA459B
4. Apply multi-purpose grease to each bearing cone.
5. Pack grease seal lip with multi-purpose grease, then install it
into wheel hub with suitable drift.
SFA828B
Knuckle Spindle
REMOVAL
NGAX0016
1. Remove free-running hub assembly (4WD models).
Refer to “Auto-lock Free-running Hub”, AX-9.
2. Remove wheel hub and rotor disc.
Refer to “Wheel Hub and Rotor Disc”, AX-11.
SFA844-A
3. Separate drive shaft from knuckle spindle by slightly tapping
drive shaft end (4WD models).
AFA139
4. Separate tie-rod from knuckle spindle with Tool.
Install stud nut conversely on stud bolt so as not to damage
stud bolt.
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FRONT AXLE
Wheel Hub and Rotor Disc (Cont’d)
AX-13
SFA829B
5. Separate knuckle spindle from ball joints.
a. Loosen (do not remove) upper and lower ball joint tightening
nuts.
SFA079
b. Separate knuckle spindle from upper and lower ball joint studs
with Tool.
During above operation, never remove ball joint nuts
which are loosened in step (a) above.
Tool:
2WD
ST29020001 (J24319-01)
4WD
HT72520000 (J25730-B)
SFA830B
c. Remove ball joint tightening nuts.
Support lower link with jack.
d. Remove knuckle spindle from upper and lower links.
INSPECTION
NGAX0017
Knuckle Spindle
NGAX0017S01
¼ Check knuckle spindle for deformation, cracks and other dam-
age by using a magnetic exploration or dyeing test.
Bearing Spacer (2WD models)
NGAX0017S02
¼ Check bearing spacer for damage.
Needle Bearing (4WD models)
NGAX0017S03
¼ Check needle bearing for wear, scratches, pitting, flaking and
burn marks.
SFA962-C
INSTALLATION
NGAX0018
1. Install needle bearing into knuckle spindle (4WD models).
Make sure that needle bearing is facing in the proper direction.
Apply multi-purpose grease.
FRONT AXLE
Knuckle Spindle (Cont’d)
AX-14
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