Main Control: Assembly

Main Control Upper Half 

1. 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.

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Main Control Lower Half 

1. 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.

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1. 3.
   
   
   NOTE: A VFS is calibrated from the factory and are not all the same. To replace a VFS, match the replacement solenoid nozzle color and the band number with the original solenoid or harsh/erratic shifts, harsh/soft engagement 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 with a black nozzle, normally low VFS with a brown nozzle or an ON/OFF solenoid. If replacing a VFS, record the band number and the solenoid nozzle color to get the correct part number for the solenoid.

   1. 1.
      
      Screens

   1. 2.
      
      O-rings

   1. 3.
      
      Solenoid nozzle

   1. 4.
      
      Solenoid band number

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1. 4.
   
   Install the solenoids into their correct bores as indicated during disassembly.

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1. 5.
   
   Install the shift control solenoid hold down bracket and the 8 hold down bracket bolts.
   • Tighten to 6 Nm (53 lb-in).

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1. 6.
   
   
   NOTE: 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. 1.
      
      Solenoid dampers

   1. 2.
      
      Check balls

   1. 3.
      
      Converter drain back valve

   1. 4.
      
      Small filter screen

   1. 5.
      
      Large filter screen

   1. 6.
      
      Empty hydraulic passage (no check ball)

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1. 7.
   
   
   NOTE: Some vehicles may not have been built with a foam strip seal. A new foam strip seal should be installed on all molded lead frames.

   Install a new foam strip seal on the molded leadframe.

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1. 8.
   
   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. 1.
      
      Molded leadframe

   1. 2.
      
      Main control upper valve body

   1. 3.
      
      Guide pins

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1. 9.
   
   
   NOTE: 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. 1.
      
      Main control separator plate

   1. 2.
      
      Drain back valves

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1. 10.
   
   Position the main control lower valve body on the 2 molded leadframe alignment studs, align the manual valve with the TR sensor on the molded leadframe and install the main control lower valve body.

   1. 1.
      
      Main control lower valve body

   1. 2.
      
      Manual valve

   1. 3.
      
      TR sensor

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1. 11.
   
   Install the 6 long molded leadframe-to-valve body bolts hand-tight.

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1. 12.
   
   Install the 19 short main control assembly lower-to-upper valve body bolts. Tighten the bolts in the sequence shown in illustration.
   • Tighten bolts 1 through 6 to 6 Nm (53 lb-in).
   • Tighten bolts 7 through 25 to 7 Nm (62 lb-in).

Fig 1: Main Control Assembly Tightening Sequence

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