AW 50-42 Valve Body

Transmission

TM ® A u t o m o t i v e

T e c h n i c a l

N e w s l e t t e r s

Volume 22, No. 3

March 2005

AW50-40 LE Series We provide exploded views of the valve body and identification of components in AW50-42LE units. After overhaul, the speedometer on a Volvo/SAAB vehicle equipped with a 50-40 LE series transaxle may register in the Park position, and there may be no Reverse when the driver selects Reverse from the Park position.

Volvo/S olvo/SAAB AAB AW50-42LE Exploded Views of Valve Body and Identification of Components

Refer to Figure 1 for solenoid identification and locations on the valve body.

Refer to Figure 6 for valve identification i dentification and locations in the lower valve body, rear side.

Refer to Figure 2 for valve identification i dentification and locations in the upper valve body.

Refer to Figure 7 for illustrations of the typical spacer plates.

Refer to Figure 3 for valve identification i dentification and locations in the center valve body, front side.

Refer to Figure 8 for the checkvalve and checkball locations in the lower valve body.

Refer to Figure 4 for valve identification i dentification and locations in the center valve body, rear side.

Refer to Figure 9 for the screen locations l ocations in the center valve body, upper-valve-body side.

Refer to Figure 5 for valve identification i dentification and locations in the lower valve body, front side.

Refer to Figure 10 for the checkvalve and checkball locations in the center valve body, lower-valve-body side.

® (ISSN 1058479X) is published monthly by M D Publications Inc., 3057 E. Cairo, Springfield, MO 65802. One-year subscription USA and US Transmission Tech/Talk ® possessions is $89, all other countries is $100, payable in US dollars only. Address correspondence to Transmission Tech/Talk , P.O. Box 2210, Springfield, MO ® 65801-2210, telephone (417) 866-3917 or e-mail [email protected]. Information contained in Transmission Tech/Talk has been carefully compiled from industry

sources known for their reliability, but M D Publications does not guarantee guarantee its accuracy. Periodicals postage paid at Springfield, MO. POSTMASTER: Please send address changes to Transmission Tech/Talk ® , P.O. Box 2236, Springfield, MO 65801-2236.

Copyright © 2005 M D Publications Inc. Reproduction Reproduction Strictly Forbidden

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PRINTED IN THE U.S.A.

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Figure 1 Solenoid Identification and Locations 2

2

2

9 9

Shift solenoid 2 Shift solenoid 1

Pressure-control solenoid

TCC solenoid

Figure 2 Upper Valve Body Valve Identification and Locations

1 1

55

2 2

3 3 4 4

1. 2. 3. 4. 5.

Upper-valve-body casting Pressure-control-solenoid Pressure-control-solenoid Pressure-control-solenoid Pressure-control-solenoid

regulator valve regulator-valve spring regulator-valve bore plug regulator-valve bore-plug retainer

Copyright © 2005 M D Publications Inc. Reproduction Strictly Forbidden

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Figure 3 Retainer Locations

Center Valve Body, Front Side: Valve Identification and Locations

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21.

Center valve-body casting Manual valve 2-3 shift valve 2-3 shift-valve spring 2-3 shift-valve bore plug 2-3 shift-valve retainer (location not shown) 3-4 shift valve 3-4 shift-valve spring 3-4 shift-valve bore plug 3-4 shift-valve retainer 1-2 shift valve 1-2 shift-valve spring 1-2 shift-valve bore plug 1-2 shift-valve retainer Neutral control valve Neutral-control-valve retainer Primary regulator valve Primary-regulator-valve spring Plunger Plunger sleeve Plunger-sleeve retainer

1 1

17

21 21 19 19

16 16

18

17

18

15 15

20 20 14 14

11 11 10 10

12 12 7 7

13 13

8 8

3 3

9 9 4 4 5 5

2 2

66

Figure 4 Retainer locations

Center Valve Body, Rear Side: Valve Identification and Locations

Retainer locations

5

5 0 1 9

99

66

22

Center-valve-body casting Clutch modulator valve Clutch-modulator-valve spring Clutch-modulator-valve bore plug Clutch-modulator-valve retainer

6. 7. 8. 9.

TCC-solenoid TCC-solenoid TCC-solenoid TCC-solenoid

regulator valve regulator-valve spring regulator-valve bore plug regulator-valve retainer


3

88 55

3

3

1

1

1. 2. 3. 4. 5.

77

44

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Figure 5

Retainer locations

Lower Valve Body, Front Side: Valve Identification and Locations

10 10 11 11

14 14 12 12 13 13

8 8 9 9

66 7 7

4 4

1 1

55 3 3

6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17.

2 2 15 15 17 17

16 16

1. 2. 3. 4. 5.

Lower valve body C3 accumulator piston C3 accumulator-piston spring C3 accumulator valve C3 accumulator-valve spring

Figure 6

B1 accumulator valve B1 accumulator-valve spring Low coast modulator valve (B3) Low coast modulator-valve spring (B3) Lockup control valve Lockup-control-valve spring Plunger Plunger sleeve Lockup-control-valve retainer Cover-plate gasket Cover plate Cover-plate bolts (6)

Retainer locations

Lower Valve Body, Rear Side: Valve Identification and Locations 15 15

17 17 14 14

16 16

13 13 10 10 12 12

55

11 11

8 8 6 6

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.

1 1 Lower valve body C2 accumulator piston C2 accumulator spring (inner) C2 accumulator spring (outer) C2 accumulator valve C2 accumulator-valve spring B2 accumulator piston B2 accumulator spring (inboard) B2 accumulator spring (outboard) B2 accumulator valve B2 accumulator spring Accumulator control valve

4 4

7 7

9 9

3

3

2 2

13. 14. 15. 16. 17. 18. 19. 20.

Accumulator-control-valve spring Secondary regulator valve Secondary-regulator-valve spring Secondary-regulator-valve bore plug Secondary-regulator-valve retainer Cover-plate gasket Cover plate Cover-plate bolts (6)


4

18 18 19 19

20 20

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Figure 7 Typical Spacer Plates

Center valve body to upper valve body

W 1

Lower valve body to case


5

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Figure 8

Lower Valve Body Checkvalve and spring

Pressure-relief valve and spring

Requires four rubber checkballs 5.0mm (0.197 in.) in diameter

Figure 9 Volvo/SAAB AW50-42LE Center Valve Body, Upper-Valve-Body Side 4 small filter screens

Large filter screen


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Figure 10 Volvo/SAAB AW50-42LE Center Valve Body, Lower-Valve-Body Side

Checkvalve assembly (early models only)

Bypass valve and spring

If the spacer plate has only one small hole over either location DO NOT install a checkball.

A checkball can go in either location as indicated by the arrows. It depends upon the spacer-plate configuration.

Checkvalve and spring

If the spacer plate has one large and one small hole over either location, INSTALL a checkball.

Requires seven rubber checkballs 5.0 mm (0.197 in.) in diameter


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Daewoo/Volvo AW50-40 LE Series No Reverse Complaint:

Correction:

After overhaul, vehicles equipped with the 50-40 Refer to Figure 11 for the wire colors of the turbineLE series transaxles may exhibit a speedometer that shaft-speed sensor and the vehicle-speed sensor and is registering in the Park position and no Reverse their correct locations on the case. when the driver selects Reverse from the Park position. Reverse will engage if Drive is selected Figure 10 Speed-Sensor Locations and Wire Colors before Reverse. Turbine-Speed Sensor

Cause:

The cause may be that during installation, the vehicle-speed sensor was placed into the location of the turbine-shaft-speed sensor on the case. This will create a vehicle-speed reading in the Park position because of the turbine shaft’s rotation in the Park position. The transmission control module will cancel Reverse application by turning on solenoid 1 to block the application of the B3 clutch, which is the low/reverse clutch. Once the selector is placed into Drive, the turbine shaft will come to a stop and Reverse will apply from the Drive position.

Vehicle-Speed Sensor

Volvo Yellow/red Yellow/brown

Volvo Tan Gray

Daewoo Yellow/black Light green

Daewoo Yellow Gray

Note: The wire colors listed are at the sensor. The color may change leading to the transmission control module.

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AW 50-42 Valve Body

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