2001 INFINITI QX4 transmission

SAT860A
DISASSEMBLY AND ASSEMBLYNBAT0135Forward and overrun clutches are serviced essentially the same
way as reverse clutch is serviced. However, note the following
exceptions.
ICheck of forward clutch operation
SAT861A
ICheck of overrun clutch operation
SAT865A
IRemoval of forward clutch drum
Remove forward clutch drum from transmission case by hold-
ing snap ring.
SAT862A
IRemoval of forward clutch and overrun clutch pistons
a) While holding overrun clutch piston, gradually apply com-
pressed air to oil hole.
SAT863A
b) Remove overrun clutch from forward clutch.
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REPAIR FOR COMPONENT PARTS
Forward and Overrun Clutches (Cont'd)
AT-321

SAT382I
3. Remove low one-way clutch inner race, spring retainer and
return spring from transmission case.
4. Remove seal rings from low one-way clutch inner race.
5. Remove needle bearing from low one-way clutch inner race.
SAT876A
6. Remove low and reverse brake piston using compressed air.
7. Remove oil seal and D-ring from piston.
INSPECTIONNBAT0138Low and Reverse Brake Snap Ring and Spring RetainerNBAT0138S01ICheck for deformation, or damage.
SAT829A
Low and Reverse Brake Return SpringsNBAT0138S02ICheck for deformation or damage. Also measure free length
and outside diameter.
Inspection standard:
Refer to SDS, AT-357.
SAT845A
Low and Reverse Brake Drive PlatesNBAT0138S03ICheck facing for burns, cracks or damage.
IMeasure thickness of facing.
Thickness of drive plate:
Standard value
Model 4EX16 (2WD)
1.90 - 2.05 mm (0.075 - 0.081 in)
Model 4EX17, 4EX23 (4WD)
1.52 - 1.67 mm (0.0598 - 0.0657 in)
Wear limit
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REPAIR FOR COMPONENT PARTS
Low & Reverse Brake (Cont'd)
AT-325

SAT880A
3. Install piston by rotating it slowly and evenly.
IApply ATF to inner surface of transmission case.
SAT881A
4. Install return springs, spring retainer and low one-way clutch
inner race onto transmission case.
5. Install dish plate, low and reverse brake drive plates, driven
plates and retaining plate.
6. Install snap ring on transmission case.
SAT872A
7. Check operation of low and reverse brake clutch piston. Refer
to ªDISASSEMBLYº, AT-324.
SAT885A
8. Measure clearance between retaining plate and snap ring.
If not within allowable limit, select proper retaining plate.
Specified clearance:
Standard
0.8 - 1.1 mm (0.031 - 0.043 in)
Allowable limit
2.7 mm (0.106 in)
Retaining plate:
Refer to SDS, AT-360.
SAT884A
9. Install low one-way clutch inner race seal ring.
IApply petroleum jelly to seal ring.
IMake sure seal rings are pressed firmly into place and
held by petroleum jelly.
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REPAIR FOR COMPONENT PARTS
Low & Reverse Brake (Cont'd)
AT-327

SAT931A
Assembly (1)NBAT01551. Install manual shaft components.
a. Install oil seal onto manual shaft.
IApply ATF to oil seal.
IWrap threads of manual shaft with masking tape.
b. Insert manual shaft and oil seal as a unit into transmission
case.
c. Remove masking tape.
SAT932A
d. Push oil seal evenly and install it onto transmission case.
SAT933A
e. Align groove in shaft with retaining pin hole, then retaining pin
into position as shown in figure at left.
SAT901E
f. Install detent spring and spacer.
g. While pushing detent spring down, install manual plate onto
manual shaft.
SAT936A
h. Install lock nuts onto manual shaft.
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ASSEMBLY
Assembly (1)
AT-339

SAT523GA
2. Install accumulator piston.
a. Install O-rings onto accumulator piston.
IApply ATF to O-rings.
Accumulator piston O-rings
Unit: mm (in)
Accumulator A B C D
Small diameter end 29 (1.14) 32 (1.26) 45 (1.77) 29 (1.14)
Large diameter end 45 (1.77) 50 (1.97) 50 (1.97) 45 (1.77)
SAT938A
b. Install return spring for accumulator A onto transmission case.
Free length of return spring:
Refer to SDS, AT-357.
SAT939AA
c. Install accumulator pistons A, B, C and D.
IApply ATF to transmission case.
SAT941A
3. Install band servo piston.
a. Install return springs onto servo piston.
SAT942A
b. Install band servo piston onto transmission case.
IApply ATF to O-ring of band servo piston and transmis-
sion case.
c. Install gasket for band servo onto transmission case.
ASSEMBLY
Assembly (1) (Cont'd)
AT-340

SAT940A
d. Install band servo retainer onto transmission case.
SAT943A
4. Install rear side clutch and gear components.
a. Place transmission case in vertical position.
SAT944A
b. Slightly lift forward clutch drum assembly. Then slowly rotate it
clockwise until its hub passes fully over clutch inner race inside
transmission case.
SAT945A
c. Check to be sure that rotation direction of forward clutch
assembly is correct.
SAT946A
d. Install thrust washer onto front of overrun clutch hub.
IApply petroleum jelly to the thrust washer.
IInsert pawls of thrust washer securely into holes in over-
run clutch hub.
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ASSEMBLY
Assembly (1) (Cont'd)
AT-341

SAT947A
e. Install overrun clutch hub onto rear internal gear assembly.
SAT948A
f. Install needle bearing onto rear of overrun clutch hub.
IApply petroleum jelly to needle bearing.
SAT949A
g. Check that overrun clutch hub rotates as shown while holding
forward clutch hub.
SAT527G
h. Place transmission case into horizontal position.
SAT951A
i. Install rear internal gear, forward clutch hub and overrun clutch
hub as a unit onto transmission case.
ASSEMBLY
Assembly (1) (Cont'd)
AT-342

SAT952A
j. Install needle bearing onto rear internal gear.
IApply petroleum jelly to needle bearing.
SAT953A
k. Install bearing race onto rear of front internal gear.
IApply petroleum jelly to bearing race.
ISecurely engage pawls of bearing race with holes in front
internal gear.
SAT954A
l. Install front internal gear on transmission case.
SAT546J
5. Install rear extension assembly on transmission case (2WD
model only).
a. Install revolution sensor on rear extension.
b. Install rear extension gasket on transmission case.
c. Install parking rod on transmission case.
d. Install parking gear and needle bearing.
IInsert rear extension assembly into place while holding
parking gear and needle bearing by hand.
SAT216B
6. Install output shaft and parking gear (4WD model only).
a. Insert output shaft from rear of transmission case while slightly
lifting front internal gear.
IDo not force output shaft against front of transmission
case.
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ASSEMBLY
Assembly (1) (Cont'd)
AT-343