Electrohydraulic Unit

NAG1 TRANSMISSION

Electrohydraulic Unit
DISASSEMBLY
1. Remove electrohydraulic unit from the vehicle.





2. Remove solenoid caps (1, 2) (Fig. 113).
3. Unscrew Torx socket bolts (3, 4) (Fig. 113).

NOTE: Pay attention to the different lengths of the Torx socket bolts.

4. Remove leaf springs (5).
5. Withdraw solenoid valves (6 - 11) from shift plate (13).

NOTE: Check O-rings on solenoid valves for damage and replace if necessary.

6. Bend away retaining lug on stiffening rib on transmission oil temperature sensor.
7. Remove electrohydraulic control module (12) from the shift plate (13).





8. Note the locations of the major shift valve group components for assembly reference (Fig. 114).

NOTE: Pay great attention to cleanliness for all work on the shift plate. Fluffy cloths must not be used. Leather cloths are particularly good. After dismantling, all parts must be washed and blown out with compressed-air, noting that parts may be blown away.





9. Unbolt leaf spring (5) (Fig. 115).
10. Unscrew Torx bolts (1) (Fig. 115).
11. Remove valve housing (2) from valve body (4) (Fig. 115).





12. Remove the strainers for the modulating pressure and shift pressure control solenoid valves (Fig. 116) from the valve housing.





13. Remove the strainer (1) (Fig. 117) in the inlet to torque converter lock-up control solenoid valve.
14. Remove sealing plate (3).

NOTE: A total of 12 valve balls are located in the valve body, four made from plastic (4) and eight from steel (1, 3).





15. Note the location of all check balls (1, 3, 4) (Fig. 118) and the central strainer (2) for re-installation. Remove all check balls (1, 3, 4) and the central strainer (2).
16. Remove the screws holding the side covers to the valve body and valve housing.





17. Remove all valves and springs from the valve body (1) (Fig. 119). Check all valves for ease of movement and shavings.

NOTE: The sleeves and pistons of the overlap regulating valves must not be mixed up.





18. Remove all valves and springs from the valve housing (2) (Fig. 120). Check all valves for ease of movement and shavings.





19. Remove the pressure supply valve (1) (Fig. 121) from the valve body.

ASSEMBLY

NOTE: Pay great attention to cleanliness for all work on the shift plate. Fluffy cloths must not be used. Leather cloths are particularly good. After dismantling, all parts must be washed and blown out with compressed-air, noting that parts may be blown away.





1. Install the pressure supply valve (1) (Fig. 122) into the valve body





2. Install all valves and springs from the valve body (1) (Fig. 123). Check all valves for ease of movement and shavings.

NOTE: The sleeves and pistons of the overlap regulating valves must not be mixed up.





3. Install all valves and springs into the valve housing (2) (Fig. 124). Check all valves for ease of movement and shavings.
4. Install the screws to hold the side covers to the valve body and valve housing. Tighten the screws to 4 Nm (35 inch lbs.).

NOTE: A total of 12 valve balls are located in the valve body, four made from plastic (4) and eight from steel (1, 3).





5. Install all check balls (1, 3, 4) (Fig. 125) and the central strainer (2).





6. Install the strainer (1) (Fig. 126) in the inlet to torque converter lock-up control solenoid valve.





7. Position the sealing plate (3) onto the valve body (4) (Fig. 127).
8. Install the valve housing (2) onto the valve body (4) and sealing plate (3).
9. Install the shift plate Torx bolts (1) (Fig. 127). Tighten the bolts to (8 Nm (71 inch lbs.).
10. Install leaf spring (5) (Fig. 127).





11. Install the strainers for the modulating pressure and shift pressure control solenoid valves (Fig. 128) into the valve housing.





12. Install the electrohydraulic control module (12) onto the shift plate (13) (Fig. 129).
13. Bend the retaining lug on stiffening rib on transmission oil temperature sensor to retain the electrohydraulic control module.
14. Install the solenoid valves (6 - 11) into shift plate (13).

NOTE: Check O-rings on solenoid valves for damage and replace if necessary.

15. Install the leaf springs (5).
16. Install the Torx socket bolts (3, 4) (Fig. 129). Tighten the bolts to (8 Nm (71 inch lbs.).

NOTE: Pay attention to the different lengths of the Torx socket bolts.

17. Install the solenoid caps (1, 2).
18. Install the electrohydraulic unit into the vehicle.