Nissan Terrano r20e. Instruction — part 41
Low & Reverse Brake
DISASSEMBLY
1. Check operation of low and reverse brake.
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,
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D-ring might be damaged.
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Oil seal might be damaged.
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Fluid might be leaking past piston check ball.
2. Remove snap ring, low and reverse brake drive plates, driven
plates and dish plate.
NAT298
SAT872A
SAT873A
REPAIR FOR COMPONENT PARTS
AT-161
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.
6. Remove low and reverse brake piston using compressed air.
7. Remove oil seal and D-ring from piston.
INSPECTION
Low and reverse brake snap ring and spring retainer
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Check for deformation, or damage.
Low and reverse brake return springs
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Check for deformation or damage. Also measure free length
and outside diameter.
Inspection standard:
Refer to SDS, AT-197.
Low and reverse brake drive plates
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Check facing for burns, cracks or damage.
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Measure thickness of facing.
Thickness of drive plate:
Standard value
1.52 - 1.67 mm (0.0598 - 0.0657 in)
Wear limit
1.4 mm (0.055 in)
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If not within wear limit, replace.
SAT382I
SAT876A
SAT829A
SAT845A
REPAIR FOR COMPONENT PARTS
Low & Reverse Brake (Cont’d)
AT-162
Low one-way clutch inner race
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Check frictional surface of inner race for wear or damage.
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Install a new seal rings onto low one-way clutch inner race.
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Be careful not to expand seal ring gap excessively.
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Measure seal ring-to-groove clearance.
Inspection standard:
Standard value: 0.10 - 0.25 mm (0.0039 - 0.0098 in)
Allowable limit: 0.25 mm (0.0098 in)
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If not within allowable limit, replace low one-way clutch inner
race.
ASSEMBLY
1. Install needle bearing onto one-way clutch inner race.
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Pay attention to its direction — Black surface goes to rear
side.
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Apply petroleum jelly to needle bearing.
2. Install oil seal and D-ring onto piston.
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Apply ATF to oil seal and D-ring.
3. Install piston by rotating it slowly and evenly.
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Apply ATF to inner surface of transmission case.
SAT877A
SAT878A
SAT112B
SAT879A
SAT880A
REPAIR FOR COMPONENT PARTS
Low & Reverse Brake (Cont’d)
AT-163
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.
7. Check operation of low and reverse brake clutch piston. Refer
to “DISASSEMBLY”, AT-161.
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
2.5 mm (0.098 in)
Retaining plate:
Refer to SDS, AT-198.
9. Install low one-way clutch inner race seal ring.
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Apply petroleum jelly to seal ring.
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Make sure seal rings are pressed firmly into place and held
by petroleum jelly.
SAT881A
SAT872A
SAT885A
SAT884A
REPAIR FOR COMPONENT PARTS
Low & Reverse Brake (Cont’d)
AT-164
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