Volvo 50-42LE transmission. Instruction - page 11

S1

"OFF"

VIEWED FROM THE

WORM TRACK SIDE

n.c.

STH (epc)

SL

"OFF"

X

X

X

X

X

X

X

X

X

X

X

.039" balance

orifice thru valve

PRESSURE CONTROL

SOLENOID REG. VALVE

MANUAL VALVE

2-3 SHIFT

VALVE

3-4 SHIFT

VALVE

1-2 SHIFT

VALVE

NEUTRAL CONTROL

VALVE (Blocked)

CLUTCH MODULATOR

VALVE

TCC SOLENOID

REGULATOR VALVE

PRESSURE REGULATOR

VALVE

SECONDARY REGULATOR

VALVE

LOCK-UP CONTROL

VALVE

C1 ACCUMULATOR

LOW COAST

MODULATOR

VALVE (B3)

LEGEND

B1 ACCUMULATOR

VALVE

ACCUMULATOR

CONTROL

VALVE

B2 ACCUMULATOR

VALVE

B2

ACCUMULATOR

C2 ACCU-

MULATOR

C2 ACCU-

MULATOR

VALVE

C3 ACCUMULATOR

VALVE

OUTPUT

SUCTION

TCC

RELEASE SIDE

TCC

APPLY SIDE

THE RETURN

LINE IS LOCATED

IN THE FRONT PAN

CLUTCH PACKS

C3

ACCUMULATOR

.038" ORIFICE

.058" CROSS-

DRILLED HOLE

.0

3

0

"

.0

3

0

"

2

2

6

W

1

.0

5

1

"

VOID

C-3

C-3

ATF

COOLER

X

X

B4 BRAKE BAND

"ON"

B4 SERVO

B4 ACCUMULATOR

PISTON

B

-4

A

-2

.0

3

2

"

.0

8

6

"

.0

4

0

"

.0

3

5

"

.0

3

9

"

.0

4

2

"

**

.0

3

9

"

C

B

3

C

B

6

.0

7

8

"

Rear

lube

Central

lube

Pressure

port

503L

SUMP

X

X

PUMP

TORQUE

CONVERTER

B-1

C

B

1

C

B

2

C

B

8

C

B

9

C

B

1

0

.059"

X

.047"

X

X

COOLER

RELIEF

X

03

.

2"

X

X

X

X

503L

.0

4

0

"

X

X

X

X

.032”

Differential

lube

.0

5

9

”

.0 2"

3

B

1

9
B

1

9

n.c.

S2

"ON"

n.o.

X

X

X

X

X

X

.035" balance

orifice thru valve

P

R N D 3 L

50-42LE

2

4

9

W

2

.0

3

9

"

C

B

4

C

B

5

.0

5

0

"

.0

4

2

"

W

2

W

2

X

X

.039"

.070"

.0

3

9

"

.0

3

9

"

X

X

.0

3

0

"

C

B

7

MANUAL "1" POSITION

1st GEAR

C2 CLUTCH

(DIRECT CLUTCH)

LEGEND

LINE PRESSURE

EPC PRESSURE

SECONDARY REG.
PRESSURE

TO SUMP

SOLENOID PRESSURE

COOLER PRESSURE

CONNECTED CIRCUIT

W1- W2 SPACER
PLATE DIFFERENCES

** THIS HOLE IS USED ONLY

ON CHECK VALVE VERSIONS

ACCUMULATOR BACK PRESH.

C1 CLUTCH

(FORWARD CLUTCH)

B1 BRAKE

(OVERRUN BRAKE)

B2 BRAKE

(INT. BRAKE)

C3 CLUTCH

(UNDERDRIVE CLUTCH)

LOW COAST MOD. PRESH.

B3 BRAKE

(LOW/REV. BRAKE)

.058” ORIFICE

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

44

Copyright © 2004 ATSG

1. Place the transmission on a suitable work
bench.
2. Remove the 8, 12 mm headed pump to case
retaining bolts as shown in Figure 42 .
3. Using a suitable pump puller, remove the pump
from the bellhousing as shown in Figure 43 and
set it aside for further disassembly.
4. Once the pump is removed, remove the B2-
Second Coast Brake Hub assembly as shown in
Figure 44.
5. Remove the 5, 12 mm headed bellhousing to
main case bolts as shown in Figure 45.
NOTE: See Figure 45 for bolt lengths.

Figure 42

TRANSMISSION DISASSEMBLY

Figure 43

Figure 44

Continued on Page 45

B2- Second Coast Brake Hub

Bolt lengths

8 Pump to case retaining bolts 28mm long

5 bellhousing to case retaining bolts

A = 30mm long

B = 35mm long

C = 35mm long
D = 30mm long

E = 45mm long

Figure 45

B

C

D

E

A

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

45

6. Remove the 6 , 12mm headed bellhousing to
main case bolts as shown in figure 46. Note:
Bolts are 30mm long.
7. Stand the transmission up on its back cover
and remove the remaining 5, 12mm headed
bellhousing to main case bolts as shown in
Figure 47. Note: Bolts are 30mm long.
8. Using a rubber mallet, tap the bellhousing
evenly in the direction of the arrows shown in
Figure 48 and set it off to the side.
9. Remove the differential carrier shown in Figure
49.

TRANSMISSION DISASSEMBLY

CONTINUED

Figure 47

Figure 46

Figure 48

Differential carrier

Figure 49

Continued on Page 46

Copyright © 2004 ATSG

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

46

Copyright © 2004 ATSG

10. Remove the 10 mm headed filter retaining
bolt, shown in Figure 50, and discard the filter.
Note: The bolt length is 13mm.
11. Remove the 27 torx headed output shaft speed
sensor bolt and remove the sensor as shown in
Figure 51. Note: The bolt length is 13mm
long.
12. Remove the 2, 10mm headed oil deflector
plate retaining bolts and the 2, 10mm headed
case plate retaining bolts as shown in Figure
52. Note the bolt lengths are 13mm long.
13. Remove the 2, 10mm headed detent spring
retaining bolts, detent spring and park rod
guide as shown in Figure 53. Refer to Figure
54 to see this assembly removed from the
Case. Note the bolt lengths are 15.5mm long.

Figure 50

TRANSMISSION DISASSEMBLY

CONTINUED

Figure 51

See bolt legend in Figure 45 for lengths

Filter

Output speed sensor

Oil deflector plate

Case plate

Figure 52

Figure 53

Park rod guide

Detent spring

REMOVED

Figure 54

Continued on Page 47

Filter retaining bolt