Page 337 of 2543
A340E(Others) AUTOMATIC TRANSMISSIONFIRST AND REVERSE BRAKE -
AT-80
FIRST AND REVERSE BRAKE
COMPONENTS
FIRST AND REVERSE BRAKE
DISASSEMBLY
1. CHECK PISTON STROKE OF FIRST AND REVERSE
BRAKE
Make sure the first and reverse brake pistons move
smoothly when applying and releasing the compressed
air into the transmission case.
2. REMOVE PISTON RETURN SPRING
(a) Place SST on the spring retainer and compress the return
spring.
SST 09350-30020 (09350-07050)
(b) Using SST, remove the snap ring.
SST 09350-30020 (09350-07070)
AT063-05
AT0CB-02
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A340E(Others) AUTOMATIC TRANSMISSIONFIRST AND REVERSE BRAKE -
AT-81
3. REMOVE NO.2 BRAKE PISTON
(a) Hold No.2 brake piston with hand, apply compressed air
to transmission case to remove No.2 brake piston.
HINT: If the piston does not pop out with compressed air,
lift the piston out with needle-nose pliers.
(b) Remove the O-ring from No.2 brake piston.
4. REMOVE REACTION SLEEVE
(a) Using SST, remove the reaction sleeve.
SST 09350-30020 (09350-07080)
(b) Remove the O-ring from the reaction sleeve.
5. REMOVE NO.1 BRAKE PISTON
(a) Using SST, remove the No.1 brake piston.
SST 09350-30020 (09350-07090)
(b) Remove 2 O-rings from the No.1 piston.
FIRST AND REVERSE BRAKE INSPECTION
1. INSPECT DISC, PLATE AND FLANGE
Check to see if the sliding surface of the disc, plate and
flange are worn or burnt. If necessary, replace them.
HINT:
If the lining of the disc is peeling off or discolored or
even if a part of the printed numbers are defaced, re-
place all discs.
Before assembling new discs, soak them in ATF for
at least 15 minutes.
2. CHECK PISTON RETURN SPRING
Check the return spring free length together with the
spring seat.
Standard free length:
12.9 mm (0.508 in.)
AT0CC-02
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A340E(Others) AUTOMATIC TRANSMISSIONFIRST AND REVERSE BRAKE -
AT-82
FIRST AND REVERSE BRAKE PISTON
ASSEMBLY
1. INSTALL NO.1 BRAKE PISTON
(a) Coat the 3 new O-rings with ATF.
(b) Install the 2 O-rings on No.1 brake piston.
(c) Install the O-ring on the reaction sleeve.
(d) Install the No.1 brake piston on the reaction sleeve.
2. INSTALL REACTION SLEEVE AND NO.1 BRAKE PIS-
TON TO TRANSMISSION CASE
With the No.1 brake piston underneath (the rear side),
install the brake reaction sleeve and No.1 brake piston to
the transmission case.
NOTICE: Be careful not to damage the O-rings.
3. INSTALL NO.2 BRAKE PISTON
(a) Coat the new O-ring with ATF.
(b) Install the O-ring on No.2 brake piston.
(c) With the spring seat of the piston upwards (the front side),
place the piston in the transmission case.
NOTICE: Be careful not to damage the O-rings.
(d) Place the piston return spring onto the No.2 brake piston.
4. INSTALL PISTON RETURN SPRING
(a) Place SST on the spring retainer and compress the return
spring.
SST 09350-30020 (09350-07050)
(b) Using SST, install the snap ring.
SST 09350-30020 (09350-07070)
AT0CD-02
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A340E(Others) AUTOMATIC TRANSMISSIONFIRST AND REVERSE BRAKE -
AT-83
5. CHECK PISTON STROKE OF FIRST AND REVERSE
BRAKE
Make sure the first and reverse brake pistons move
smoothly when applying and releasing the compressed
air into the transmission case.
Page 341 of 2543
A340E(Others) AUTOMATIC TRANSMISSIONREAR PLANETARY GEAR -
AT-84
REAR PLANETARY GEAR
COMPONENTS
REAR PLANETARY GEAR, NO.2 ONE-WAY
CLUTCH AND OUTPUT SHAFT
DISASSEMBLY
1. REMOVE OUTPUT SHAFT FROM REAR PLANETARY
GEAR ASSEMBLY
2. REMOVE OIL SEAL RING FROM OUTPUT SHAFT
AT065-03
AT066-05
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A340E(Others) AUTOMATIC TRANSMISSIONREAR PLANETARY GEAR -
AT-85
3. REMOVE REAR PLANETARY GEAR FROM REAR
PLANETARY RING GEAR
4. CHECK OPERATION OF NO.2 ONE-WAY CLUTCH
Hold the planetary gear and turn the one-way clutch inner
race. Check that the one-way clutch inner race must be
able to turn freely counterclockwise and locks clockwise.
5. REMOVE NO.2 ONE-WAY CLUTCH
(a) Remove the one-way clutch inner race from the rear
planetary gear.
(b) Remove the snap ring with a screwdriver.
(c) Remove the No.2 one-way clutch with retainers from the
planetary gear.
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A340E(Others) AUTOMATIC TRANSMISSIONREAR PLANETARY GEAR -
AT-86
6. REMOVE NO.2 AND NO.1 THRUST WASHERS
7. REMOVE RACES AND BEARING FROM REAR PLAN-
ETARY RING GEAR
8. REMOVE RING GEAR FLANGE
(a) Remove the snap ring with a screwdriver.
(b) Remove the ring gear flange.
REAR PLANETARY GEAR INSPECTION
MEASURE PLANETARY PINION GEAR THRUST
CLEARANCE
Using a feeler gauge, measure the planetary pinion gear
thrust clearance.
Standard clearance:
0.20-0.60 mm (0.0079-0.0236 in.)
Maximum clearance:
1.00 mm (0.0394 in.)
AT067-04
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A340E(Others) AUTOMATIC TRANSMISSIONREAR PLANETARY GEAR -
AT-87
If the clearance is greater than the maximum, replace the
planetary gear assembly.
REAR PLANETARY GEAR, NO.2 ONE-WAY
CLUTCH AND OUTPUT SHAFT ASSEMBLY
1. INSTALL RING GEAR FLANGE
(a) Install the ring gear flange.
(b) Using a screwdriver, install the snap ring.
2. INSTALL RACES AND BEARING
Coat the races and bearing with petroleum jelly, and
install them onto the rear planetary ring gear.
Races and bearing diameter
mm (in.)
InsideOut side
Race (A)28.8 (1.134)44.8 (1.764)
Bearing30.1 (1.185)44.7 (1.760)
Race (B)27.8 (1.094)44.8 (1.764)
3. INSTALL NO.1 AND NO.2 THRUST WASHERS
(a) Coat the thrust washers with petroleum jelly.
(b) Install the thrust washers onto both sides of the rear plan-
etary gear.
HINT: Make sure that the lug shapes match the cutout
portions on the rear planetary gear.
4. INSTALL NO.2 ONE-WAY CLUTCH
(a) Install the one-way clutch and 2 retainers into the rear
planetary gear.
HINT: Make sure that the open ends of the guides on the
one-way clutch are faced upward.
AT068-07