Isuzu N-Series. Manual - part 187

FRONT AXLE 4C-43

Removal

Preparation:
Jack up and support the vehicle on stands.

1. Wheel and Tire
2. Front Locking Hub Set

Refer to “FREE WHEEL HUB” previously in this
section.

3. Front Hub Bearing Lock Washer
4. Front Hub Bearing Lock Nut

Front Hub Bearing Lock Nut Wrench:
5-8840-2182-0

5. Front Hub and Brake Drum Assembly

Hub Remover: 9-8521-0187-0

6. Front Axle Hub Outer Bearing
7. Front Axle Hub Inner Bearing

If the inner bearing is left on the spindle side,
gouge from left and right with a screwdriver, and if
floating up, pull to remove it.

8. Front Hub Oil Seal

When removing the oil seal, hit the outer flange of
oil seal. The oil seal must not be reused.

9. Front Axle Hub Inner Bearing Outer Race

10. Front Axle Hub Outer Bearing Outer Race

Remove the outer race by driving out race from the
hub with a brass drift inserted behind race in notch-
es in the hub.

11. Front Wheel Pin and Nut (Inside Drum Fixing Type)

Remove nuts and hit with hammer, or use a press
to remove wheel pin.
Remove the wheel pin as necessary.

12. Brake Drum
13. Front Axle Hub
14. Front Wheel Pin and Nut (Outside Drum Fixing

Type)
Remove nuts and hit with hammer, or use a press
to remove wheel pin.
Remove the wheel pin as necessary.

N4A0342E

N4A0343E

N4A0344E

N4A0345E

4C-44 FRONT AXLE

Inspection and Repair

Make necessary adjustments, repairs, and part replace-
ment if excessive wear or damage is discovered during
inspection.
Front Axle Hub

1. Inspect the inner surface of front axle hub.

Inspect the fitting portions of front axle hub bearing
outer race and hub lock body assembly for crack,
damage or wear.

2. Inspect the outer surface of front axle hub.

Inspect the flange and oil seal fitting portion for
crack, deformation or damage.

Bearing
Inspect the bearing for excessive wear, abnormal noise,
rough rotation, and seizure

Front Hub Bearing Lock Washer
Inspect the lock washer for wear, deformation or crack,
and also the lug for break.

Front Hub Bearing Lock Nut
Inspect the bearing lock nut threads and contact surfac-
es for excessive wear, warpage, and other damage.
Light damage to the contact surfaces can be repaired
with an oil stone or a piece of fine sandpaper.

Installation

1. Front Wheel Pin and Nut (Outside Drum Fixing

Type)
If a wheel pin is replaced or removed, tighten the
nut to the specified torque and calk the nut at three
places per pin.

Tighten:
Front wheel pin nut to 392 N

⋅m (40 kg⋅m / 289 lb⋅ft)

N4A0346E

N4A0347E

N4A0348E

N4A0349E

FRONT AXLE 4C-45

2. Front Axle Hub
3. Brake Drum

On the model with outside drum fixing type, tighten
the brake drum bolts to the specified torque.

Tighten:
Brake drum bolt to 13 N

⋅m (1.3 kg⋅m / 113 lb⋅in)

4. Front Wheel Pin and Nut (Inside Drum Fixing Type)

Tighten the nut to the specified torque and calk the
nut at three places per pin.

Tighten:
Front wheel pin nut to 392 N

⋅m (40 kg⋅m / 289 lb⋅ft)

5. Front Axle Hub Outer Bearing Outer Race
6. Front Axle Hub Inner Bearing Outer Race

Use the bearing outer race installer to install the
outer race to the hub.
Inner Bearing Outer Race Installer:
5-8840-2184-0
Outer Bearing Outer Race Installer:
5-8840-2183-0

7. Front Hub Oil Seal

1) Apply grease (Multipurpose type) to the oil seal

lip inner circumferences.

2) Use the oil seal installer to install the oil seal to

the hub.
Oil Seal Installer: 5-8840-2187-0
During installation of oil seal, do not press or hit
it other than outer flange of seal.

Apply the specified amount of the approved grease to
the hub cavity, the outer bearing and the inner bearing.
Grease amount: 200 g (7.1 oz) per each side

8. Front Axle Hub Inner Bearing

Install the inner bearing to the spindle.

9. Front Axle Hub Outer Bearing

Install the outer bearing to the front hub assembly.

10. Front Hub and Brake Drum Assembly
11. Front Hub Bearing Lock Nut

Install the hub bearing lock nut with (1) slits facing
outside, and tighten provisionally.

N4A0350E

N4A0351E

N4A0352E

N4A0353E

4C-46 FRONT AXLE

<Adjustment of Hub Bearing Preload>

1) Turn the hub to the left and right several times

to establish bearing conformity.

2) Use the bearing nut wrench to tighten the bear-

ing nut until the hub can not be manually rotat-
ed.
Bearing Nut Wrench:5-8840-2182-0

3) Loosen the bearing nut until hub rotates easily.

4) Set the spring balancer to the wheel pin in the

position shown in the illustration.
Gradually retighten the nut until the hub bear-
ing is adjusted to the specified preload.

Hub bearing preload,
New Hub bearing: 17 — 31 N

⋅m (1.7 — 3.2 kg⋅m / 3.7 —

7.1 lb

⋅ft)

Reused Hub bearing: 14 — 28 N

⋅m (1.4 — 2.9 kg⋅m / 3.1

— 6.4 lb

⋅ft)

5) Rotate the hub several times to the right and

left.
Measure the bearing preload a second time.

6) Align the axle case groove (1) with the closest

bearing nut slit.

Notice:
If it is difficult to align the axle case and bearing nut,
slightly tighten the bearing nut.

12. Front Hub Bearing Lock Washer

Engage the lug of lock washer with a notch in the
spindle.
Apply adhesive (LOCTITE 242 or equivalent) to the
threads of lock washer bolt, and tighten the hub
bearing lock nut with lock washer.

Tighten:
Lock washer bolt to 10 N

⋅m (1.0 kg⋅m / 87 lb⋅in)

In order to ensure locking, equally spaced 48 slits
are scribed on the hub bearing lock nut. The
tapped holes in hub bearing lock nut will meet ei-
ther hole in lock washer (two holes provided at
symmetric position) if a slit of hub bearing lock nut
is aligned with the notch center at the threads of
spindle end.
Under this condition, tightening the bolts fix surely
the hub bearing lock nut.

N4A0354E

N4A0355E

N4A0356E