clutch INFINITI QX56 2004 Factory Service Manual

DISASSEMBLY
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Revision: August 20072004 QX56
DISASSEMBLYPFP:31020
DisassemblyUCS002JJ
CAUTION:
Do not disassemble parts behind Drum Support. Refer to AT-18, "
Cross-Sectional View (2WD models)"
or AT- 1 9 , "Cross-Sectional View (4WD models)" .
1. Drain ATF through drain plug.
2. Remove torque converter by holding it firmly and turing while
pulling straight out.
3. Check torque converter one-way clutch using check tool as
shown at figure.
a. Insert check tool into the groove of bearing support built into
one-way clutch outer race.
b. When fixing bearing support with check tool, rotate one- way
clutch spline using screwdriver.
c. Check that inner race rotates clockwise only. If not, replace
torque converter assembly.
4. Remove converter housing from transmission case.
CAUTION:
Be careful not to scratch converter housing.
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AT-274
DISASSEMBLY
Revision: August 20072004 QX56
5. Remove O-ring from input clutch assembly.
6. Remove tightening bolts for oil pump assembly and transmis-
sion case.
7. Attach sliding hammer to oil pump assembly and extract it
evenly from transmission case.
CAUTION:

Fully tighten sliding hammer screw.

Make sure that bearing race is installed to the oil pump
assembly edge surface.
8. Remove O-ring from oil pump assembly.
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DISASSEMBLY
AT-275
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Revision: August 20072004 QX56
9. Remove bearing race from oil pump assembly.
10. Remove needle bearing from front sun gear assembly.
11. Remove front sun gear assembly from front carrier assembly.
NOTE:
Remove front sun gear assembly by rotating left/right.
12. Remove seal rings from input clutch assembly.
13. Remove front carrier assembly, input clutch assembly and rear
internal gear as a unit.
CAUTION:
Be careful to remove it with needle bearing.
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AT-278
DISASSEMBLY
Revision: August 20072004 QX56
22. Remove mid sun gear assembly, rear sun gear assembly and
high and low reverse clutch hub as a unit.
CAUTION:
Be careful to remove then with bearing races and needle
bearing.
23. Remove high and low reverse clutch assembly from direct clutch
assembly.
CAUTION:
Make sure that needle bearing is installed to the high and
low reverse clutch assembly edge surface.
24. Remove direct clutch assembly from reverse brake.
25. Remove needle bearing from drum support edge surface.
26. Remove snap ring from A/T assembly harness connector.
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DISASSEMBLY
AT-279
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Revision: August 20072004 QX56
27. Push A/T assembly harness connector.
CAUTION:
Be careful not to damage connector.
28. Remove oil pan and oil pan gasket.
29. Check foreign materials in oil pan to help determine causes of
malfunction. If the A/T fluid is very dark, smells burned, or con-
tains foreign particles, the frictional material (clutches, band)
may need replacement. A tacky film that will not wipe clean indi-
cates varnish build up. Varnish can cause valves, servo, and
clutches to stick and can inhibit pump pressure.

If frictional material is detected, perform A/T fluid cooler
cleaning. Refer to AT-15, "
A/T Fluid Cooler Cleaning" .
30. Remove magnets from oil pan.
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AT-292
REPAIR FOR COMPONENT PARTS
Revision: August 20072004 QX56
3. Using a drift, install oil pump housing oil seal to the oil pump
housing until it is flush.
CAUTION:

Do not reuse oil seal.

Apply ATF to oil seal.
4. Install oil pump housing in oil pump cover. Tighten oil pump
housing fitting bolt to the specified torque. Refer to AT-290,
"COMPONENTS" .
Front Sun Gear, 3rd One-Way ClutchUCS002J L
COMPONENTS
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1. Front sun gear 2. 3rd one-way clutch 3. Snap ring
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REPAIR FOR COMPONENT PARTS
AT-293
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Revision: August 20072004 QX56
DISASSEMBLY
1. Using a flat-bladed screwdriver, remove snap ring from front sun
gear.
2. Remove 3rd one-way clutch from front sun gear.
INSPECTION
3rd One-way Clutch

Check frictional surface for wear or damage.
CAUTION:
If necessary, replace the 3rd one-way clutch.
Front Sun Gear Snap Ring

Check for deformation, fatigue or damage.
CAUTION:
If necessary, replace the snap ring.
Front Sun Gear

Check for deformation, fatigue or damage.
CAUTION:
If necessary, replace the front sun gear.
ASSEMBLY
1. Install 3rd one-way clutch in front sun gear.
CAUTION:
Apply ATF to 3rd one-way clutch.
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AT-294
REPAIR FOR COMPONENT PARTS
Revision: August 20072004 QX56
2. Using a flat-bladed screwdriver, install snap ring in front sun
gear.
3. Check operation of 3rd one-way clutch.
a. Hold oil pump assembly and turn front sun gear.
b. Check 3rd one-way clutch for correct locking and unlocking
directions.
CAUTION:
If not as shown in illustration, check installation direction of
3rd one-way clutch.
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REPAIR FOR COMPONENT PARTS
AT-295
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Revision: August 20072004 QX56
Front Carrier, Input Clutch, Rear Internal GearUCS002JM
COMPONENTS
1. Seal ring 2. O-ring 3. Needle bearing
4. Bearing race 5. Front carrier assembly 6. Needle bearing
7. Snap ring 8. Snap ring 9. Retaining plate
10. Driven plate 11. Input clutch drum 12. Drive plate
13. Rear internal gear
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AT-296
REPAIR FOR COMPONENT PARTS
Revision: August 20072004 QX56
DISASSEMBLY
1. Compress snap ring using 2 flat-bladed screwdrivers.
2. Remove front carrier assembly and input clutch assembly from
rear internal gear.
3. Remove front carrier assembly from input clutch assembly.
a. Remove bearing race from front carrier assembly.
b. Remove needle bearing from front carrier assembly.
c. Remove snap ring from front carrier assembly.
CAUTION:
Do not expand snap ring excessively.
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