Toyota Automatic Transmission A340 Series. Repair Manual — part 26
AT1508
AT1429
AT1510
SST
AT1430
AT1622
(c)
Measure the piston stroke while applying and re-
leasing the compressed air (4 − 8 kg /cm
2
, 57 −
114 psi or 392 − 785 kPa) as shown.
Piston stroke: 2.28 − 2.68 mm (0.0898 − 0.1055 in.)
If the values are nonstandard, inspect the discs.
2.
REMOVE FLANGE, PLATES AND DISCS
(a)
Remove the snap ring from the clutch drum.
(b)
Remove the flange, six plates and six discs.
3.
REMOVE PISTON RETURN SPRING
(a)
Place SST on the return spring and compress the
spring with a shop press.
SST
09320−89010
(b)
Using snap ring pliers, remove the snap ring.
(c)
Remove the piston return spring.
4.
REMOVE TRANSFER DIRECT CLUTCH PISTON
(a)
Place the direct clutch on the transfer front support.
(b)
Hold the transfer direct clutch piston with hand, ap-
ply compressed air to the front support to remove
the piston.
(C) Remove the transfer direct clutch piston.
(c)
Remove the two O−rings from the piston and an O−
ring from the drum.
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Direct Clutch)
AT−197
AT7905
AT4957
AT7920
AT4849
SST
Printed
Number
E7119
INSPECTION OF TRANSFER DIRECT CLUTCH
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:
S
If the lining of the disc is peeling off or discolored,
or even if parts of the printed numbers are defaced,
replace all discs.
S
Before assembling new discs, soak them in ATF for
at least fifteen minutes.
2.
CHECK TRANSFER DIRECT CLUTCH PISTON
(a)
Check that check ball is free by shaking the piston.
(b)
Check that the valve does not leak by applying
low−pressure compressed air.
3.
CHECK TRANSFER DIRECT CLUTCH DRUM CHECK
BALL
Check that check ball is free by shaking the drum.
4.
CHECK TRANSFER DIRECT CLUTCH DRUM BUSHING
Using a dial indicator, measure the inside diameter of the
clutch drum bushing.
Maximum inside diameter: 47.65 mm (1.8760 in.)
If the inside diameter is greater than the maximum, re-
place the clutch drum.
ASSEMBLY OF TRANSFER DIRECT CLUTCH
1.
INSTALL PISTON TO TRANSFER DIRECT CLUTCH
DRUM
(a)
Coat new O−rings with ATF and install them on
the piston and drum.
(b)
Place SST on the transfer direct clutch piston.
SST
09320−89010
(c)
Being careful not to damage the O−rings, tap the
piston into the drum with plastic hammer.
AT−198
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Direct Clutch)
AT1930
Thick
Plate
Disc
Thin
Plate
Flange
AT1509
AT1622
SST
3.9 (0.154)
4.3 (0.169)
4.1 (0.161)
4.5 (0.177)
AT1510 AT4918
Retainer
Claw
SST
Flange thickness
mm (in.)
2.
INSTALL PISTON RETURN SPRING
(a)
Install the piston return spring.
(4)
Place SST on the spring retainer, and compress
the spring with a shop press.
SST
09320−89010
(c)
Install the snap ring with snap ring pliers. Be sure
the end gap of the snap ring is not aligned with
the spring retainer claw.
3.
INSTALL PLATES, DISCS AND FLANGE
(a)
Install the plates and discs.
Install in order: P = Plate D = Disc
P (Thick)−D−P (Thin)−D−P (Thin)−
D−P (Thin)−D−P (Thin)−D−P (Thin)−D
(b)
Install the flange, the flat end facing downward.
(c)
Install the snap ring with a screwdriver.
4.
CHECK PISTON STROKE OF TRANSFER DIRECT
CLUTCH
(a)
Install the direct clutch onto the transfer front sup-
port.
Using SST and a dial indicator, measure the piston
stroke applying and releasing the compressed air (4
−8 kg /cm
2
, 57 − 114 psi or 392 − 785 kPa) as
shown.
SST
09350−30020 (09350−06120)
Piston stroke: 2.28 − 2.68 mm (0.0898 − 0.1055 in.)
If the piston stroke is less than the limit, parts may have
been assembled incorrectly, check and reassemble
again.
If the piston stroke is nonstandard, select another flange.
HINT: There are four different thicknesses for the flange.
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Direct Clutch)
AT−199
AT1497
AT1491
AT3196
♦ Non−reusable part
Bearing
Piston Return Spring
Piston
♦ O−Ring
Center Support
Plate
Ring Gear Flange
Cushion
Plate
Disc
Bearing
Rear Flange
Planetary Gear and
Output Shaft
Race
Planetary
Ring Gear
Snap Ring
Race
Oil Seal Ring
Front Flange
Transfer Low Speed Brake and Center Support
COMPONENTS
DISASSEMBLY OF TRANSFER LOW SPEED
BRAKE AND CENTER SUPPORT
1.
REMOVE TRANSFER CENTER SUPPORT
(a)
Remove the center support from the output shaft.
(b)
Remove the assembled bearing and race from the
center support.
AT−200
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Low Speed
Brake and Center Support)
AT1493
AT1494
AT1498
AT1492
AT1619
(c)
Remove the race from the output shaft.
2.
REMOVE PISTON RETURN SPRING
3.
REMOVE CUSHION PLATE, REAR FLANGE, PLATES
AND DISCS
Remove the cushion plate, rear flange, six plates and
seven discs.
4.
REMOVE PLANETARY RING GEAR FROM OUTPUT
SHAFT
5.
REMOVE RACE AND BEARING FROM PLANETARY
GEAR
Remove the race and bearing from rear side of the
planetary gear.
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Low Speed
Brake and Center Support)
AT−201
E7119
Printed
Number
AT1618
AT1616
AT1495
AT4919
6.
REMOVE PLANETARY RING GEAR FLANGE
Remove the snap ring and ring gear flange.
7.
REMOVE TRANSFER LOW SPEED BRAKE PISTON
(a)
Hold the low speed brake piston with hand, apply
compressed air into the center support and remove
the piston.
(b)
Remove the two O−rings from the piston and an
O−ring from the center support.
8.
REMOVE OIL SEAL RINGS FROM CENTER SUPPORT
Push one end of the ring into the groove and unhook both
ends of the ring by hands. Spread the ring apart and re-
move it.
INSPECTION OF TRANSFER LOW SPEED BRAKE
AND CENTER SUPPORT
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:
S
If the lining of the disc is peeling off or discolored,
or even if parts of the printed numbers are de-
faced, replace all discs.
S
Before assembling new discs, soak them in ATF
for at least fifteen minutes.
2.
CHECK CENTER SUPPORT
(a)
Check that check balls are free by shaking the
center support.
(b)
Check that the valve does not leak by applying
low−pressure compressed air.
AT−202
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Low Speed
Brake and Center Support)
AT1676
AT4851
AT4332
AT1618
AT4850
3.
CHECK CENTER SUPPORT BUSHING
Using a dial indicator, measure the inside diameter of
the center support bushing.
Maximum inside diameter: 35.08 mm (1.3811 in.)
If the inside diameter is greater than the maximum, re-
place the center support.
4.
CHECK RING GEAR FLANGE BUSHING
Using a dial indicator, measure the inside diameter of the
ring gear flange bushing.
Maximum inside diameter: 35.08 mm (1.3811 in.)
If the inside diameter is greater than maximum, replace
the flange.
5.
CHECK PLANETARY GEAR BUSHING
Using a dial indicator, measure the inside diameter of
the planetary gear bushing.
Maximum inside diameter: 18.08 mm (0.7118 in.)
If the inside diameter is greater than the maximum, re-
place the planetary gear.
6.
MEASURE PLANETARY PINION GEAR THRUST
CLEARANCE
Using a feeler gauge, measure the planetary pinion gear
thrust clearance.
Standard clearance:
0.30 − 0.60 mm
(0.0118 − 0.0236 in.)
Maximum clearance: 1.00 mm (0.0394 in.)
If the clearance is greater than the maximum, replace the
planetary gear assembly.
ASSEMBLY OF TRANSFER LOW SPEED BRAKE
AND CENTER SUPPORT
1.
INSTALL OIL SEAL RINGS TO CENTER SUPPORT
(a)
Coat the two oil seal rings with ATF.
(b)
Spread the ring apart and install it into the groove
on the center support.
NOTICE: Do not spread the ring ends too much.
(c)
Push the one end of the ring into the groove and
hook both ends with hands.
HINT: After installing the oil seal rings, check that they
rotate smoothly.
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Low Speed
Brake and Center Support)
AT−203
AT4920
AT3197
AT1494
Inside
Outside
Bearing
35.0 (1.378)
54.4 (2.142)
Race
36.3 (1.429)
53.9 (2.122)
AT1506
mm (in.)
2.
INSTALL TRANSFER LOW SPEED BRAKE PISTON
TO CENTER SUPPORT
(a)
Coat new O−rings with ATF and install them on
the piston and center support.
(b)
Being careful not to damage the O−rings, press in
the low speed brake piston into the center support
with both hands.
3.
INSTALL PLANETARY RING GEAR FLANGE
Install the flange into the ring gear and install the snap
ring.
4.
INSTALL BEARING AND RACE TO PLANETARY GEAR
Coat the bearing and race with petroleum jelly and install
them onto the planetary gear.
HINT: Bearing and race diameter
5.
INSTALL PLANETARY RING GEAR TO OUTPUT SHAFT
AT−204
−
AUTOMATIC TRANSMISSION (A340H)
Component Parts (Transfer Low Speed
Brake and Center Support)
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