1998 NISSAN PICK-UP Repair Manual

SPD429AB
FRONT FINAL DRIVER180A
PD-16

Pre-inspection
Before disassembling final drive, perform the following inspec-
tion.
lTotal preload
a. Turn drive pinion in both directions several times to set bear-
ing rollers.
b. Check total preload with Tool.
Tool number: ST3127S000
Total preload:
1.2 - 2.3 N´m
(12 - 23 kg-cm, 10 - 20 in-lb)
lRing gear-to-drive pinion backlash
Check backlash of ring gear with a dial indicator at several
points.
Ring gear-to-drive pinion backlash:
0.13 - 0.18 mm (0.0051 - 0.0071 in)
lRing gear runout
Check runout of ring gear with a dial indicator.
Runout limit:
0.05 mm (0.0020 in)
lTooth contact
Check tooth contact. Refer to ``ADJUSTMENT'', PD-26.
Final Drive Housing
1. Using three spacers [20 mm (0.79 in)], mount final drive
assembly on Tool.
Tool number: KV38100800
2. Remove extension tube and differential side shaft assembly.
SPD634
SPD635
SPD636
SPD637
SPD638
DISASSEMBLYR180A
PD-17

3. Remove differential side flange.
4. Mark side retainers for identification. Remove side retainers.
Be careful not to confuse right and left side retainers and
shims.
5. Extract differential case from final drive housing.
6. Remove side outer races.
Tool number: ST33290001
Keep the side bearing outer races together with their
respective inner cones Ð do not mix them up.
7. Remove side oil seal.
8. Loosen drive pinion nut.
Tool number: ST38060002
9. Remove companion flange with puller.
SPD713
SPD639
SPD309
PD243
SPD171A
DISASSEMBLYR180A
Final Drive Housing (Cont'd)
PD-18

10. Take out drive pinion together with pinion rear bearing inner
cone, drive pinion bearing spacer and pinion bearing adjust-
ing washer.
11. Remove front oil seal and pinion front bearing inner cone.
12. Remove pinion front and rear bearing outer races with brass
drift.
13. Remove pinion rear bearing inner cone and drive pinion
adjusting washer.
Tool number: ST30031000
Differential Case
1. Remove side bearing inner cones.
To prevent damage to bearing, engage puller jaws in
grooves.
Tool numbers:
VAST33051001
VBST33061000
SPD641
PD349
SPD209
SPD642
DISASSEMBLYR180A
Final Drive Housing (Cont'd)
PD-19

Be careful not to confuse the right and left hand parts.
2. Loosen ring gear bolts in a criss-cross fashion.
3. Tap ring gear off differential case with a soft hammer.
Tap evenly all around to keep ring gear from binding.
4. Separate differential case LH and RH.
Put match marks on both differential case LH and RH sides
prior to separating them.
Extension Tube and Differential Side Shaft
1. Remove differential side shaft assembly from extension tube.
2. Cut rear axle bearing collar with cold chisel. Be careful not
to damage differential side shaft.
SPD022
SPD024
SPD643
SPD644
SPD236A
DISASSEMBLYR180A
Differential Case (Cont'd)
PD-20

3. Reinstall differential side shaft into extension tube and
secure with bolts. Remove rear axle bearing by drawing out
differential side shaft from rear axle bearing with puller.
4. Remove grease seal.
SPD646
SPD647
DISASSEMBLYR180A
Extension Tube and Differential Side Shaft
(Cont'd)
PD-21

Ring Gear and Drive Pinion
Check gear teeth for scoring, cracking or chipping.
If any damaged part is evident, replace ring gear and drive pin-
ion as a set (hypoid gear set).
Differential Case Assembly
Check mating surfaces of differential case, side gears, pinion
mate gears, pinion mate shaft and thrust washers.
Bearing
1. Thoroughly clean bearing.
2. Check bearing for wear, scratches, pitting or flaking.
Check tapered roller bearing for smooth rotation. If damaged,
replace outer race and inner cone as a set.
SPD648
SPD715
INSPECTIONR180A
PD-22

For quiet and reliable final drive operation, the following five
adjustments must be made correctly:
1. Side bearing preload
2. Pinion gear height
3. Pinion bearing preload
4. Ring gear-to-pinion backlash. Refer to ``ASSEMBLY'',
PD-30.
5. Ring and pinion gear tooth contact pattern
Side Bearing Preload
A selection of carrier side retainer adjusting shims is
required for successful completion of this procedure.
1. Make sure all parts are clean. Also make sure the bearings
are well lubricated with light oil or type ``DEXRON
TM'' auto-
matic transmission fluid.
2. Install differential carrier and side bearing assembly into the
final drive housing.
3. Place all of the original side retainer adjusting shims onto the
side bearing retainer that goes at the ring gear end of the
carrier.
4. Install both bearing retainers onto the final drive housing and
torque the retainer bolts.
Bolt torque specification:
:9-12N´m(0.9 - 1.2 kg-m, 78 - 104 in-lb)
5. Turn the carrier several times to seat the bearings.
6. Measure the carrier turning torque with a spring gauge at the
ring gear retainer bolt.
Turning torque specification:
34.3 - 39.2 N (3.5 - 4.0 kg, 7.7 - 8.8 lb)
of pulling force at the ring gear bolt
SPD191A
SPD192A
SPD193A
SPD194A
ADJUSTMENTR180A
PD-23