INFINITI QX4 2001 Factory Service Manual

SPD736
5. Apply multi-purpose grease to cavity at sealing lips of oil seal.
Press front oil seal into carrier.
6. Install companion flange and drive pinion nut.
7. Install propeller shaft.
Tool number:
KV38100500 (J25273)
SPD740-A
REAR COVER GASKET REPLACEMENTNBPD00151. Drain gear oil.
2. Remove rear cover and rear cover gasket.
3. Install new rear cover gasket and rear cover.
4. Fill final drive with recommended gear oil.
FRONT FINAL DRIVER200A
On-vehicle Service (Cont'd)
PD-16

ComponentsNBPD0016
SPD357AD
GI
MA
EM
LC
EC
FE
AT
TF
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT FINAL DRIVER200A
Components
PD-17

Removal and InstallationNBPD0017REMOVALNBPD0017S01IRemove front of propeller shaft.
Plug front end of transfer.
IRemove drive shaft. Refer to AX-11, ªRemovalº.
IRemove front final drive mounting bolts.
CAUTION:
Be careful not to damage spline, sleeve yoke and front oil seal
when removing propeller shaft.
SPD123
INSTALLATIONNBPD0017S02IFill final drive with recommended gear oil.
SPD664
DisassemblyNBPD0018PRE-INSPECTIONNBPD0018S01Before disassembling final drive, perform the following inspection.
ITotal preload
a) Turn drive pinion in both directions several times to set bear-
ing rollers.
b) Check total preload with Tool.
Tool number: ST3127S000 (J25765-A)
Total preload:
P
1+ [0.3 - 1.5 N´m (3 - 15 kg-cm, 2.6 - 13.0 in-lb)]
P
1: Drive pinion preload
SPD513
IRing gear to drive pinion backlash
Check backlash of ring gear with a dial indicator at several
points.
Ring gear-to-drive pinion backlash:
0.10 - 0.15 mm (0.0039 - 0.0059 in)
FRONT FINAL DRIVER200A
Removal and Installation
PD-18

SPD524
IRing gear runout
Check runout of ring gear with a dial indicator.
Runout limit:
0.05 mm (0.0020 in)
ITooth contact
Check tooth contact. Refer to ªTOOTH CONTACTº, PD-29.
SPD665
ISide gear to pinion mate gear backlash
Using a feeler gauge, measure clearance between side gear
thrust washer and differential case.
Clearance between side gear thrust washer and differ-
ential case:
Less than 0.15 mm (0.0059 in)
SPD666
FINAL DRIVE HOUSINGNBPD0018S021. Using three spacers [20 mm (0.79 in)], mount final drive
assembly on Tool.
Tool number:
KV38100800 (J34310, J25604-01)
SPD644
2. Remove differential side shaft assembly.
SPD667
3. Remove differential side flange.
GI
MA
EM
LC
EC
FE
AT
TF
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT FINAL DRIVER200A
Disassembly (Cont'd)
PD-19

SPD526
4. Put matchmarks on one side of side bearing cap with paint or
punch to ensure that it is replaced in proper position during
reassembly.
Bearing caps are line-bored during manufacture and should
be put back in their original places.
PD343
5. Remove side bearing caps.
SPD668
6. Remove differential case assembly with a pry bar.
SPD527
Be careful to keep the side bearing outer races together with
their respective inner cones Ð do not mix them up.
CAUTION:
Side bearing spacer is placed on either the left or right
depending upon final drive gear ratio. It should be labeled so
that it may be replaced correctly.
SPD477A
7. Loosen drive pinion nut.
Tool number: KV38108300 (J44195)
8. Remove companion flange with puller.
FRONT FINAL DRIVER200A
Disassembly (Cont'd)
PD-20

SPD670
9. Take out drive pinion together with rear bearing inner cone,
drive pinion bearing spacer and pinion bearing adjusting
washer.
10. Remove front oil seal and pinion front bearing inner cone.
PD349
11. Remove pinion bearing outer races with a brass drift.
SPD209
12. Remove pinion rear bearing inner cone and drive pinion height
adjusting washer.
Tool number: ST30031000 (J22912-01)
SPD207A
DIFFERENTIAL CASENBPD0018S031. Remove side bearing inner cones.
To prevent damage to bearing, engage puller jaws in grooves.
Tool number:
A ST33051001 (J22888-20)
B ST33061000 (J8107-2)
SPD022
Be careful not to confuse the right and left hand parts.
Keep bearing and bearing race for each side together.
GI
MA
EM
LC
EC
FE
AT
TF
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT FINAL DRIVER200A
Disassembly (Cont'd)
PD-21

SPD024
2. Loosen ring gear bolts in a criss-cross pattern.
3. Tap ring gear off the differential case with a soft hammer.
Tap evenly all around to keep ring gear from binding.
SPD025
4. Punch off pinion mate shaft lock pin from ring gear side.
SPD236A
DIFFERENTIAL SIDE SHAFTNBPD0018S041. Cut collar with cold chisel. Be careful not to damage differen-
tial side shaft.
SPD672
2. Reinstall differential side shaft into extension tube and secure
with bolts. Remove rear axle bearing by drawing out differen-
tial side shaft from rear axle bearing with puller.
FRONT FINAL DRIVER200A
Disassembly (Cont'd)
PD-22

SPD647
SPD781
3. Remove grease seal and oil seal.
InspectionNBPD0019RING GEAR AND DRIVE PINIONNBPD0019S01Check gear teeth for scoring, cracking or chipping.
If any damaged part is evident, replace ring gear and drive pinion
as a set (hypoid gear set).
SPD097AA
DIFFERENTIAL CASE ASSEMBLYNBPD0019S02Check mating surfaces of differential case, side gears, pinion mate
gears, pinion mate shaft and thrust washers.
SPD715
BEARINGNBPD0019S031. 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.
GI
MA
EM
LC
EC
FE
AT
TF
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT FINAL DRIVER200A
Disassembly (Cont'd)
PD-23

AdjustmentNBPD0020For quiet and reliable final drive operation, the following five adjust-
ments must be made correctly:
1. Side bearing preload
2. Pinion gear height
3. Pinion bearing preload
4. Ring gear-to-pinion backlash. Refer to SDS, PD-37.
5. Ring and pinion gear tooth contact pattern
SPD527
SIDE BEARING PRELOADNBPD0020S01A selection of carrier side bearing adjusting washer is
required for successful completion of this procedure.
1. Make sure all parts are clean and that the bearings are well
lubricated with light oil or ªDEXRON
TMº type automatic trans-
mission fluid.
2. Place the differential carrier, with side bearings and bearing
races installed, into the final drive housing.
SPD894
3. Put the side bearing spacer in place.
CAUTION:
Side bearing spacer is placed on either the right or left
depending upon final drive gear ratio. Be sure to replace it on
the correct side.
SPD986
4. Using Tool, install original carrier side bearing preload shims
on the carrier end, opposite the ring gear.
Tool number: KV38100600 (J25267)
SPD526
5. Install the side bearing caps in their correct locations and
torque the bearing cap retaining bolts.
Specification:
88 - 98 N´m (9 - 10 kg-m, 65 - 72 ft-lb)
6. Turn the carrier several times to seat the bearings.
FRONT FINAL DRIVER200A
Adjustment
PD-24

SPD194A
7. Measure the turning torque of the carrier at the ring gear retain-
ing bolts with a spring gauge, J8129.
Specification:
34.3 - 39.2 N (3.5 - 4.0 kg, 7.7 - 8.8 lb) of pulling force
at the ring gear bolt
SPD772
8. If the carrier turning torque is not within the specification range,
increase or decrease the total thickness of the side bearing
adjusting washers until the turning torque is correct. If the
turning torque is less than the specified range, install washers
of greater thickness; if the turning torque is greater than the
specification, install thinner washers. See the SDS section for
washer dimensions and part numbers.
9. Record the total amount of washer thickness required for the
correct carrier side bearing preload.
SPD668
10. Remove the carrier from the final drive housing, saving the
selected preload washers for later use during the assembly of
the final drive unit.
SPD769
PINION GEAR HEIGHT AND PINION BEARING
PRELOAD
NBPD0020S021. Make sure all parts are clean and that the bearings are well
lubricated.
2. Assemble the pinion gear bearings into the pinion pre-load
shim selector Tool, J34309.
SPD197A
IFront Pinion BearingÐ make sure the J34309-3 front pinion
bearing seat is secured tightly against the J34309-2 gauge
anvil. Then turn the front pinion bearing pilot, J34309-5, to
secure the bearing in its proper position.
IRear Pinion BearingÐ the rear pinion bearing pilot, J34309-
15, is used to center the rear pinion bearing only. The rear
pinion bearing locking seat, J34309-4, is used to lock the bear-
ing to the assembly.
GI
MA
EM
LC
EC
FE
AT
TF
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FRONT FINAL DRIVER200A
Adjustment (Cont'd)
PD-25