Nissan Terrano model r20 series 2004. Instruction — part 282
Removal and Installation
I
Set the auto-lock free-running hub at the condition “Free”.
I
Remove
auto-lock
free-running
hub
with
brake
pedal
depressed.
I
Remove snap ring.
I
Remove washer B, washer A and brake B.
I
After installing auto-lock free-running hub, check operation.
When installing it, apply recommended grease to drive shaft
end.
Inspection
Thoroughly clean parts and dry with compressed air.
Brake “A” and “B”
Measure the thickness “L” of brake “A” and “B”.
If thickness is less than the specified limit, replace brake “A” and
“B” as a set.
Wear limit “L” = 15.4 mm (0.606 in)
YFA016
SFA827
SFA829
SFA548
FRONT AXLE — Auto-lock Free-running Hub
FA-14
Trouble-shooting
Noise occurring in the auto hub under any of the conditions
described is not indicative of a problem. Noise can be eliminated
by properly operating the transfer lever of the vehicle.
Noise
Was the transfer lever shifted from
the “2H” to the “4H” position while
the vehicle was operated at a
speed greater than 40 km/h (25
MPH)?
No
E
Yes
Shifting the transfer lever from the
“2H” to the “4H” position in high-
speed operation (Fig.
,
Fig.
), is sometimes difficult. At this
point, a clattering occurs in the
auto hub. If shifting is stopped
halfway, the drive shaft no longer
rotates and the cam is held in the
“LOCK” position (Fig.
). In this
case, the noise will continue until
the vehicle is stopped. When this
occurs, decrease vehicle speed to
less than 40 km/h (25 MPH),
return the transfer lever to the
“2H” position once and then
reshift to the “4H” position.
Gears will then be engaged and
the noise will cease (Fig.
).
Was the transfer lever shifted from
the “2H” to the “4H” position while
the vehicle was operated at a
speed less than 40 km/h (25
MPH)?
No
E
Yes
When noise occurs in the auto
hub while shifting from the “2H” to
the “4H” position (Fig.
,
Fig.
), do not stop shifting halfway.
When shifted to the “4H” position,
the “4WD” pilot lamp will come on
to indicate that the gears are
engaged properly and that the
vehicle is set in the 4WD mode.
Noise will then cease (Fig.
). If
shifting is stopped halfway, noise
will continue.
In such a case, return the transfer
lever to the “2H” position once
and re-shift it to the “4H” position.
Gears will then be engaged and
the noise will cease (Fig.
). (If
the lever is left in the “2H”
position, the noise will continue
until the vehicle is stopped.)
q
A
SFA516A
SFA517A
SFA518A
H
H
H
FRONT AXLE — Auto-lock Free-running Hub
FA-15
q
A
Was the vehicle started after the
transfer lever was shifted from the
“2H” to the “4H” or “4L” position?
No
E
Yes
A clicking noise can sometimes
occur in the auto hub when the
gears are engaged. This is not a
problem.
Noise can be encountered during
rapid acceleration while rear
wheels are slipping on snowy
roads, muddy roads, slopes, etc.
(Fig.
,
Fig.
).
In such a case, release the accel-
erator pedal to reduce engine
speed. Gears will then be
engaged and the noise will cease
(Fig.
).
Was the vehicle backed up when
the transfer lever was in the “4H”
or the “4L” position, or was the
vehicle backed up while on a
downgrade when the transfer
lever was in the “4H” or the “4L”
position?
No
E
Yes
When backing up the vehicle with
the transfer in the “4H” or the “4L”
position, auto-hub gears some-
times disengage but soon reen-
gage (Fig.
,
Fig.
,
Fig.
) with a clicking noise. This is
not a problem. Noise will also
occur if the vehicle is accelerated
rapidly while the gears are disen-
gaged. In such a case, release the
accelerator pedal once to
decrease engine speed. Gears will
then be engaged and the noise
will cease (Fig.
).
Was the vehicle turned on a dry
pavement, when the transfer lever
was in the “4H” or the “4L” posi-
tion?
No
E
Yes
Under these conditions, noise
occurs in tires (creaking) or in the
power train (rattling) — not in the
auto hub.
Avoid driving in the conditions
described above as it may lead to
tire wear.
q
B
SFA519A
SFA520A
SFA521A
SFA522A
SFA523A
H
H
H
H
FRONT AXLE — Auto-lock Free-running Hub
Trouble-shooting (Cont’d)
FA-16
q
B
Was the vehicle moved in one
direction after the vehicle was
driven in another direction when
the transfer lever was in the “4H”
or the “4L” position and then
returned to the “2H” position?
No
E
Yes
Auto-hub gears will disengage
with a resultant noise (clicking). If
the distance the vehicle is moved
in the opposite direction is short
[less than 1 m (3 ft)] or if the rota-
tion angle of the left and right
wheels is not the same (as in
rounding a corner), gears on one
side will disengage (Fig.
).
Under this condition, a noise
(crushing, etc.) might occur while
driving in the “2H” position. If only
gears on one side are unlocked,
the locked drive shaft rotates at
the same speed as wheels;
however, the unlocked drive shaft
is made to rotate in the reverse
direction by the differential. This
forces by auto hub’s slide gear to
lock in the reverse direction. As a
result, noise occurs.
If this happens, slowly move the
vehicle straight back approxi-
mately 2 to 3 m (7 to 10 ft) with
the transfer lever in the “2H” posi-
tion to disengage the gears on the
other side.
Was the vehicle driven with the
transfer lever in the “2H” position
in extremely cold weather?
No
E
Yes
In extremely cold weather (areas),
the viscosity of differential oil is
greater than in moderate weather.
When the auto hubs are unlocked
with the transfer lever set to the
“2H” position, one auto hub can
sometimes remain locked.
This causes noise during opera-
tion. Noise can also occur in the
auto hub when the front propeller
shaft is rotated due to the viscos-
ity resistance of the transfer fluid
(Fig.
).
In such a case, drive in the “4H”
position for approximately 10 min-
utes until the vehicle warms up,
and return the transfer lever to the
“2H” position to eliminate the
noise.
Disassemble and check the auto
hub.
(Refer to “Removal and
Installation”, FA-18.)
NFA005
SFA525A
H
H
H
FRONT AXLE — Auto-lock Free-running Hub
Trouble-shooting (Cont’d)
FA-17
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