Main Control

Main Control Assembly

Main Control Upper Half

Main Control Lower Half

Check Ball Location

Shift Solenoid Location

Disassembly

NOTE: Make an identifying mark on each solenoid and the corresponding bore for correct assembly.

NOTE: Solenoids may visually appear the same but their designs/functions are different. Use care not to assemble the main control assembly incorrectly. Incorrect solenoid installation results in poor transmission shift quality.

NOTE: Note the location of the 8 check balls, 6 solenoid dampers, 2 internal valves and springs and 2 filter screens for reassembly.

Main Control Upper Half

1. Make an identifying mark on each solenoid and the corresponding bore for correct assembly.

2. Remove the 6 long molded leadframe-to-valve body bolts from the molded leadframe.

3. Carefully separate the molded leadframe from the main control assembly.
   1. Molded leadframe
   2. Main control assembly

4. Remove 19 short molded leadframe-to-valve body bolts from the main control assembly.

5. Separate the lower half of the main control assembly from the upper half of the main control assembly.

6. Remove and discard the main control valve body separator plate.

7. Remove the solenoid dampers, check balls, converter drain back valve and filter screens from the main control assembly. Note the location for assembly.
   1. Solenoid dampers
   2. Check balls
   3. Converter drain back valve
   4. Small filter screen
   5. Large filter screen

8. Remove the retaining clips, caps, valves and valve springs from each bore of the main control assembly. Note the location and order for assembly.

9. Using clean mineral spirits, clean the upper half of the main control assembly.

Main Control Lower Half

10. Remove the 8 solenoid hold down bracket bolts and the solenoid hold down bracket.

11. Remove the solenoids.

12. Remove the retaining clips, caps, valves and valve springs from each bore of the main control assembly. Note the location and order for assembly.

13. Using clean mineral spirits, clean the lower half of the main control assembly.

Assembly

Main Control Upper Half

1. NOTE: Many components and surfaces in the main control valve body are precision machined. Careful handling during disassembly, cleaning, inspection and assembly prevents unnecessary damage to machined surfaces.

   Install the retaining clips, caps, valves and valve spring into each bore.

Main Control Lower Half

2. NOTE: Many components and surfaces in the main control valve body are precision machined. Careful handling during disassembly, cleaning, inspection and assembly prevents unnecessary damage to machined surfaces.

   Install the retaining clips, caps, valves and valve spring into each bore.

3. NOTICE: A Variable Force Solenoid (VFS) is calibrated from the factory and are not all the same. If replacing a VFS , match the replacement solenoid type (normally high/normally low) and the band number with the original solenoid or harsh shifts or damage to the transmission can occur.

   Inspect the solenoid screens for contamination and install new solenoids if needed. Lubricate the solenoid O-rings with clean transmission fluid.
   If replacing a solenoid, use the solenoid exploded view at the beginning of this procedure to identify what type of solenoid is being replaced. The solenoid can be a normally high VFS , normally low VFS or an ON/OFF solenoid.
   If replaceing a VFS , record the band number to get the correct part number for the solenoid.
   1. O-rings
   2. Screens
   3. Solenoid band number

4. Install the solenoids into their correct bores as indicated during disassembly.

5. Install the shift control solenoid hold down bracket and the 8 hold down bracket bolts.
   • Tighten to 6 Nm (53 lb-in).

6. NOTICE: Toward the back of the upper valve body there is a hydraulic passage that is shaped as though it receives a check ball. This passage does not require a check ball. Be sure not to mistake this hydraulic passage for a passage that does require a check ball or damage to the transmission can occur.

   Install the solenoid dampers, check balls, converter drain back valve and filter screens.
   1. Solenoid dampers
   2. Check balls
   3. Converter drain back valve
   4. Small filter screen
   5. Large filter screen
   6. Empty hydraulic passage (no check ball)

7. Align the guide pins on the molded leadframe with the holes in the main control upper valve body and install the valve body onto the molded leadframe.
   1. Molded leadframe
   2. Main control upper valve body
   3. Guide pins

8. NOTICE: If the drain back valves are not installed correctly in the separator plate, damage to the transmission can occur.

   Position the new main control separator plate on the main control upper valve body.
   Check the 2 drain back valves to be sure they are correctly positioned in the separator plate when the separator plate is pressed flush against the main control upper valve body.
   1. Main control separator plate
   2. Drain back valves

9. Position the main control lower valve body on the 2 molded leadframe alignment studs, align the manual valve with the Transmission Range (TR) sensor on the molded leadframe and install the main control lower valve body.
   1. Main control lower valve body
   2. Manual valve
   3. TR sensor

10. Install the 6 long molded leadframe-to-valve body bolts hand-tight.

11. Install the 19 short main control assembly lower-to-upper valve body bolts. Tighten the bolts in the sequence shown.
    • Tighten bolts 1 through 6 to 6 Nm (53 lb-in).
    • Tighten bolts 7 through 25 to 7 Nm (62 lb-in).