Isuzu N-Series. Service manual — part 166
REAR AXLE 4B-21
Installation
1. Brake Drum
2. Hub
1) Clean the hub inside and outside surfaces.
2) Apply bearing grease to the hub cavity.
Hub bearing grease amount, 285 g (10.1 oz)
3. Wheel Pin
1) Right side hub wheel pins (1) have right hand
threads and left side hub wheel pins (2) have
left hand threads.
2) Install the wheel pins (3) to the hub (4).
Note the installation direction shown in the illus-
tration.
Tap the wheel pin into the hub with a hammer.
3) Wheel Pin Nut Torque
Brake drum diameter 228 mm: 206 N
⋅m (21 kg⋅m / 152
lb
⋅ft)
Brake lining width 75 mm: 343 N
⋅m (35 kg⋅m / 253 lb⋅ft)
Brake lining width 100 mm: 392 N
⋅m (40 kg⋅m / 289 lb⋅ft)
N4A0105E
N4A0106E
N
⋅m (kg⋅m/lb⋅ft)
(WHLPIN
M16
Flange
nut)
Brake drum diameter
228 mm / 240 mm /
260 mm
270 (27.6/200)
(WHLPIN
M16 Hex
nut)
Brake drum diameter
228 mm / 240 mm /
260 mm
235 (24/173)
(WHLPIN
M18)
Brake lining width 75
mm / 100 mm
343 (35/253)
N4A0107E
N4A0108E
4B-22 REAR AXLE
4) Caulk three portions of each wheel nut to pre-
vent them from loosening.
4. Outer Bearing Outer Race
5. Inner Bearing Outer Race
Use the bearing outer race installer and the drive
handle to install the outer race to the hub.
Outer Bearing Outer Race Installer:
9-8522-1195-0
(Outer race outside diameter 92 mm (3.6 in.))
9-8522-1610-0
(Outer race outside diameter 97.6 mm (3.8 in.))
Drive Handle:
9-8522-1608-0
Inner Bearing Outer Race Installer:
9-8522-1194-0
(Outer race outside diameter 101.6 mm (4 in.))
9-8522-1609-0
(Outer race outside diameter 108 mm (4.3 in.))
5-8840-2426-0
(Outer race outside diameter 120 mm (4.72 in.))
Drive Handle:
9-8522-1148-0
6. Inner Bearing
Apply an ample coat of bearing grease between
the inner race and the roller cage.
7. Inner Oil Seal
1) Apply grease to the oil seal lip inner and outer
circumferences.
2) Use the oil seal installer and the drive handle to
install the oil seal to the hub.
Oil Seal Installer:
9-8522-1607-0 (Except NQR70)
Oil Seal Installer:
5-8840-2427-0 (NQR70)
Drive Handle:
9-8522-1608-0
(WHLPIN
M20)
Brake lining width 100
mm / 120 mm
392 (40/289)
N
⋅m (kg⋅m/lb⋅ft)
N4A0109E
N4A0110E
N4A0111E
REAR AXLE 4B-23
8. Hub and Brake Drum
1) Wipe away any oil or other foreign material
from the brake linings and the brake drum in-
side surfaces.
2) Clean the rear axle case tip.
3) Install the hub assembly to the rear axle case.
9. Outer Bearing
Apply an ample coat of bearing grease between
the inner race and the roller cage.
10. Bearing Lock Nut
Install the lock nut with the notched line facing out.
Hub Bearing Preload Measuring Method
1) Turn the hub to the left and right several times
to establish bearing conformity.
2) Use the bearing nut wrench (1) to tighten the
bearing nut until the hub can not be manually
rotated.
Bearing Nut Wrench:
9-8522-1188-0 (For lock bolt P.C.D. 70 mm
(2.8 in.))
9-8522-1606-0 (For lock bolt P.C.D. 74 mm
(2.9 in.))
N4A0112E
N4A0113E
N4A0111E
N4A0114E
4B-24 REAR AXLE
3) Loosen the bearing nut until hub rotates easily.
4) Set the spring balancer (2) to the wheel pin (3)
in the position shown in the illustration.
5) Measure the hub bearing preload by carefully
pulling on the spring balancer and noting the in-
dicator reading.
6) Rotate the hub several times to the right and
left.
7) Measure the bearing preload a second time.
8) Align the axle case groove with the closest
bearing nut slit.
Notice:
If it is difficult to align the axle case and bearing nut,
slightly tighten the bearing nut.
11. Lock Washer
1) Install the lock washer (6) with the lock washer
tabs inserted to the axle case grooves.
2) Install the lock bolts (7) to prevent the bearing
nut from loosening.
3) Check that the lock washer tabs (8) are insert-
ed to the axle case grooves.
Hub Bearing Preload
(At Wheel Pin)
N (kg/lb)
P.C.D.139.7
61.1 — 75.6 (6.2 —
7.7/13.7 — 17)
P.C.D.170
50.2 — 62.2 (5.1 —
6.3/11.2 — 13.9)
P.C.D.184.15
46.3 — 57.4 (4.7 —
5.9/10.4 — 13)
P.C.D.203.2
42 — 52 (4.3 — 5.3/
9.5 — 11.7)
P.C.D.222.25
38 — 48.0 (3.9 — 4.9/
8.6 — 10.8)
N4A0115E
N4A0116E
Legend
4. Bearing nut slit
5. Lock nut
N4A0117E
N4A0118E
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