Infiniti QX4 (R50). Manual — part 79
SAT838A
DISASSEMBLY
NBAT0125
1.
Remove valves at parallel pins.
2.
Remove valves at retainer plates.
For removal procedures, refer to “DISASSEMBLY” of Control
Valve Upper Body.
SAT829A
INSPECTION
NBAT0126
Valve Springs
NBAT0126S01
I
Check each valve spring for damage or deformation. Also
measure free length and outer diameter.
Inspection standard:
Refer to SDS, AT-357.
I
Replace valve springs if deformed or fatigued.
Control Valves
NBAT0126S02
I
Check sliding surfaces of control valves, sleeves and plugs for
damage.
SAT838A
ASSEMBLY
NBAT0127
I
Install control valves.
For installation procedures, refer to “ASSEMBLY” of Control
Valve Upper Body, AT-309.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Control Valve Lower Body (Cont’d)
AT-313
Reverse Clutch
COMPONENTS
NBAT0128
SAT157K
SAT841A
DISASSEMBLY
NBAT0129
1.
Check operation of reverse clutch.
a.
Install seal ring onto oil pump cover and install reverse clutch.
Apply compressed air to oil hole.
b.
Check to see that retaining plate moves to snap ring.
c.
If retaining plate does not contact snap ring,
I
D-ring might be damaged.
I
Oil seal might be damaged.
I
Fluid might be leaking past piston check ball.
SAT842A
2.
Remove drive plates, driven plates, retaining plate, dish plate
and snap ring.
REPAIR FOR COMPONENT PARTS
Reverse Clutch
AT-314
SAT524G
3.
Remove snap ring from clutch drum while compressing clutch
springs.
I
Do not expand snap ring excessively.
4.
Remove spring retainer.
SAT844A
5.
Install seal ring onto oil pump cover and install reverse clutch
drum. While holding piston, gradually apply compressed air to
oil hole until piston is removed.
I
Do not apply compressed air abruptly.
6.
Remove D-ring and oil seal from piston.
INSPECTION
NBAT0130
Reverse Clutch Snap Ring and Spring Retainer
NBAT0130S01
I
Check for deformation, fatigue or damage.
SAT845A
Reverse Clutch Drive Plates
NBAT0130S03
I
Check facing for burns, cracks or damage.
I
Measure thickness of facing.
Thickness of drive plate:
Standard value: 1.90 - 2.05 mm (0.0748 - 0.0807 in)
Wear limit: 1.80 mm (0.0709 in)
I
If not within wear limit, replace.
Reverse Clutch Dish Plate
NBAT0130S04
I
Check for deformation or damage.
SAT846A
Reverse Clutch Piston
NBAT0130S05
I
Shake piston to assure that balls are not seized.
I
Apply compressed air to check ball oil hole opposite the return
spring. Make sure there is no air leakage.
I
Also apply compressed air to oil hole on return spring side to
assure that air leaks past ball.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
REPAIR FOR COMPONENT PARTS
Reverse Clutch (Cont’d)
AT-315
SAT847A
ASSEMBLY
NBAT0131
1.
Install D-ring and oil seal on piston.
I
Apply ATF to both parts.
SAT848A
2.
Install piston assembly by turning it slowly and evenly.
I
Apply ATF to inner surface of drum.
3.
Install spring retainer.
SAT524G
4.
Install snap ring while compressing clutch springs.
SAT850A
I
Do not align snap ring gap with spring retainer stopper.
SAT842A
5.
Install drive plates, driven plates, retaining plate and dish plate.
6.
Install snap ring.
REPAIR FOR COMPONENT PARTS
Reverse Clutch (Cont’d)
AT-316
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