Nissan Frontier D22. Manual — part 716
WHEEL HUB AND KNUCKLE
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FAX
WHEEL HUB AND KNUCKLE
PFP:40202
Removal and Installation
EDS0013J
WAX029
FAX-10
WHEEL HUB AND KNUCKLE
WAX026
AUTO-LOCK FREE-RUNNING HUB
FAX-11
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AUTO-LOCK FREE-RUNNING HUB
PFP:40260
Description
EDS0013K
Auto-lock free-running hubs are locked by placing the transfer case into the 4WD mode and moving the vehi-
cle. 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 exam-
ple, if the noise is heard at the left front wheel, the right front hub is still locked and is not unlocking. This con-
dition 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
FAX-12, "Trouble Diagnosis For
Removal and Installation
EDS0013L
1.
Remove auto-lock free-running hub assembly.
AAX008
SFA828B
FAX-12
AUTO-LOCK FREE-RUNNING HUB
2.
Remove snap ring.
3.
Remove spindle washer and fixed cam assembly.
4.
Install fixed cam assembly. Be sure to align the tabs of the fixed
cam assembly to the notches of the knuckle.
CAUTION:
During installation, apply recommended grease to the parts.
5.
Place the spindle washer and then the snap ring over the axle
shaft positioning them between the two locking grooves.
6.
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 locking groove.
7.
After installing auto-lock free-running hub, check operation.
Inspection
EDS0013M
1.
Check axle axial end play. Refer to
2.
Inspect fixed cam (thrust washer) assembly. If this part shows evidence of galling or heat damage—usu-
ally caused by too little axle axial end play—replace as necessary. Check axle axial end play if this part is
replaced. Refer to
.
3.
Inspect hub assembly. Hold inner splines on 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 pos-
sibly 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 operation and the absence of noise.
Trouble Diagnosis For Noise
EDS0013N
AFA143
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).
Shifting into 4WD at higher speeds
is difficult and may cause damage
to transfer case
Stop the vehicle or decrease speed to less
than 40 km/h (25 mph). Return the transfer
case lever to the 2H position once, then re-
shift to the 4H position. 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).
Transfer case was not fully engaged
or shifting was stopped halfway so
that only one hub locked
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.
If the rear wheels slip during the hub
locking operation, noise can occur
in the hubs
Reduce engine speed and drive forward
slowly. The hubs will lock evenly and the
noise will stop.
Ratchet noise in hub after shifting the transfer
case into 2WD and backing up to unlock the hubs.
The hubs may not be fully released
Stop the vehicle, make sure the transfer
case lever is fully in the 2H position, then
back up slowly in a straight line at least 2-3
meters (7-10 feet).
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