Transfer INFINITI QX4 2001 Factory Service Manual

2. Align width across flat-notch with oil pump groove, and install
transfer motor.
3. Tighten bolts.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
4. Install breather pipe to transfer motor.
5. Connect transfer motor harness connector.
SMT875C
Transfer Oil Filter
REMOVALNBTF0071IRemove bolts to detach oil filter.
IWhen removing oil filter from transfer, avoid damaging it.
Be sure to loosen bolts evenly.
IWhen removing oil filter, be sure to replace O-ring with
new one.
INSTALLATIONNBTF00721. Apply petroleum jelly or ATF to O-ring.
2. Tighten bolts evenly to install oil filter.
:7-9N´m(0.7 - 0.9 kg-m, 61 - 78 in-lb)
IBe sure not to damage oil filter.
ON-VEHICLE SERVICE
Transfer Motor (Cont'd)
TF-118

SMT897C
RemovalNBTF00731. Remove exhaust front and rear tubes. Refer to FE-8,
ªEXHAUST SYSTEMº.
2. Remove front and rear propeller shaft. Refer to PD-6,
ªRemoval and Installationº.
3. Insert plug into rear oil seal after removing propeller shaft.
IBe careful not to damage spline, sleeve yoke and rear oil
seal, when removing propeller shaft.
4. Disconnect neutral-4LO switch, front revolution sensor, ATP
switch, transfer motor and 4WD shift switch harness connec-
tors.
SMT808D
5. Remove center console and A/T control device.
6. Remove floor panel for transfer.
7. Remove upper side fixing bolt for A/T and TF.
8. Remove actuator lever from transfer outer shift lever and
remove sub-oil pump from transfer.
9. Remove remaining fixing bolt for AT and TF.
SMT899C
SMT871C
10. Remove transfer from transmission.
WARNING:
Support transfer while removing it.
SMT872C
InstallationNBTF0074ITighten bolts securing transfer.
Bolt length:
45 mm (1.77 in)
Tightening torque:
: 31 - 42 N´m (3.2 - 4.3 kg-m, 23 - 31 ft-lb)
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REMOVAL AND INSTALLATION
Removal
TF-119

Transfer Gear ControlNBTF0075
SMT809D
1. Actuator 2. Actuator lever 3. Outer shift lever
OVERHAUL
Transfer Gear Control
TF-120

Transfer ComponentsNBTF0076
SMT810D
1. Oil seal
2. Transfer cover
3. Snap ring
4. Washer
5. Snap ring
6. Main gear bearing
7. Front case
8. Check plug
9. Check spring
10. Check ball
11. Internal gear
12. Snap ring
13. Bearing race
14. Thrust needle bearing
15. Planetary carrier
16. Thrust needle bearing
17. Sun gear18. L-H sleeve
19. 2-4 sleeve
20. Radial needle bearing
21. Front revolution sensor
22. Roll pin
23. L-H fork
24. 2-4 fork
25. Shift fork spring
26. Fork guide
27. Roll pin
28. Shift rod
29. Self-lock nut
30. Companion flange
31. Oil seal
32. Drain plug
33. Wait detection switch
34. Needle bearing35. Mainshaft
36. Drive chain
37. Clutch drum
38. Clutch hub
39. Snap ring
40. Driven plate
41. Drive plate
42. Retaining plate
43. Return spring assembly
44. Press flange
45. Washer
46. Thrust needle bearing
47. Snap ring
48. Seal ring
49. Front bearing
50. Front drive shaft
51. Rear bearing
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OVERHAUL
Transfer Components
TF-121

SMT811D
55. Thrust needle bearing race
56. Clutch piston
57. D-ring
58. Lip seal
59. Oil gutter
60. Center case
61. Stem bleeder
62. Mainshaft rear bearing
63. Thrust washer
64. Speedometer drive gear
65. Snap ring
66. Rear case
67. ATP switch
68. Neutral-4LO switch69. Oil seal
70. Magnet
71. Baffle plate
72. Oil strainer
73. O-ring
74. Control valve assembly
75. Lip seal (7 pieces)
76. Filler plug
77. Inner gear
78. Outer gear
79. Oil pump housing
80. Bushing
81. Oil pump shaft
82. Oil pressure check plug83. Oil pump gasket
84. Sub-oil pump housing
85. Outer gear
86. Inner gear
87. O-ring
88. Sub-oil pump cover
89. O-ring
90. Transfer motor
91. O-ring
92. Oil filter stud
93. O-ring
94. O-ring
95. Oil filter
OVERHAUL
Transfer Components (Cont'd)
TF-122

SMT924C
7. Remove 4WD solenoid valve, clutch pressure switch, 2-4WD
shift solenoid valve, line pressure switch, and transfer fluid
temperature sensor from control valve assembly.
8. Remove O-rings from each solenoid valve, switch and termi-
nal body.
IDo not reuse O-rings.
SMT925C
9. Place control valve with lower body facing up, remove two
mounting bolts, and then remove lower body and separator
plate from upper body.
CAUTION:
IBe careful not to drop relief balls. Detach lower body care-
fully.
IDo not reuse separator plate.
SMT926C
10. Make sure reverse balls, relief balls and relief springs, accu-
mulator pistons, valve springs, and filters are securely installed
as shown in the figure, and remove them.
SMT927C
11. Remove retainer plates.
SMT928CA
12. Remove each control valve, spring and plug.
DISASSEMBLY
Center Case (Cont'd)
TF-130

SMT929C
Mainshaft Rear BearingNBTF0078S051. Remove mainshaft rear bearing from center case using a
remover (ST35291000) and a remover (ST30090010).
SMT930C
Main Oil PumpNBTF0078S061. Remove bolts as shown in figure to detach main oil pump.
SMT931C
2. Remove outer gear and inner gear.
SMT932C
Sub-oil PumpNBTF0078S071. Remove bolts to detach transfer motor from center case. Then
remove O-ring from the transfer motor.
IDo not reuse O-ring.
SMT933C
2. Remove sub-oil pump mounting bolts.
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DISASSEMBLY
Center Case (Cont'd)
TF-131

SMT996C
2. Remove bolts to detach transfer cover.
IDo not reuse bolts.
SMT997C
3. Remove oil seal from transfer cover.
IDo not reuse oil seal.
SMT998C
4. Remove snap ring from main gear bearing.
IDo not reuse snap ring.
SMT999C
5. Remove sun gear by tapping it lightly.
SMT001D
6. Remove snap ring from sun gear.
IDo not reuse snap ring as it is a selective part.
7. Remove washer from sun gear.
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DISASSEMBLY
Front Case (Cont'd)
TF-135

SMT945C
Control ValveNBTF0081S04ICheck oil filter screen for damage. If any is found, replace with
new one.
SMT946CA
ICheck resistance between terminals of 4WD solenoid valve,
2-4WD shift solenoid valve and transfer fluid temperature sen-
sor.
Resistance:
Refer to ªCOMPONENT INSPECTIONº, TF-111.
SMT947C
ICheck sliding faces of control valves and plugs for abnormal-
ity. If any is found, replace the control valve assembly with new
one.
CAUTION:
Replace control valve body together with clutch return spring
as a set.
Control valve:
Refer to SDS, TF-157.
SMT948C
ICheck each control valve spring for damage or distortion, and
also check its free length, outer diameter and wire diameter. If
any damage or fatigue is found, replace control valve body with
new one.
IReplace control valve body together with clutch return
spring as a set.
Inspection standard:
Refer to SDS, TF-157.
SMT949C
ClutchNBTF0081S05ICheck drive plate and driven plate facings for damage, cracks
or other abnormality. If any, replace with new one.
ICheck the thickness of drive plate and driven plate facings.
Inspection standard:
Refer to SDS, TF-158.
CAUTION:
IMeasure facing thickness at 3 points to take an average.
ICheck all the drive and driven plates.
ICheck return spring for damage or deformation.
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REPAIR FOR COMPONENT PARTS
Center Case (Cont'd)
TF-139

SMT021D
15. Install washer to sun gear assembly, and select proper snap
ring so that end play ªFº of sun gear is within specifications.
Standard end play ªFº:
0 - 0.15 mm (0 - 0.0059 in)
Snap ring: Refer to SDS, TF-159.
SMT022D
16. Install the selected snap ring.
IDo not reuse snap rings.
17. Apply ATF to the periphery of new transfer cover oil seal, and
attach it at 1.5 mm (0.059 in) from the transfer cover and face.
IDo not reuse oil seal.
SMT023D
18. Apply sealing fluid (Locktite 518´C1335 x 25) to transfer cover
mounting surface of front case as shown in the figure.
CAUTION:
IRemove all foreign materials such as water, oil, and
grease from mating surfaces of front case and transfer
cover.
IPrevent sealing fluid from entering into oil holes of front
case.
SMT024D
19. Align oil hole of front case with notch of transfer cover, and
tighten bolts.
: 49 - 58 N´m (5.0 - 5.9 kg-m, 36 - 43 ft-lb)
IDo not reuse bolts.
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ASSEMBLY
Front Case (Cont'd)
TF-143