2-4 Servo Assembly Installation

Special Tools

• J 22269-01:  Accumulator and Servo Piston Remover
• J 29714-A:  Servo Cover Depressor

Fig 1: 4th Apply Piston, 2-4 Servo Cover, 2nd Apply Piston & Servo Piston Inner Housing
Courtesy of GENERAL MOTORS CORP.
1. Inspect the 4th apply piston (25), the 2-4 servo cover (28), the 2nd apply piston (17), and the servo piston inner housing (20) for the following conditions:
   • Cracks
   • Scoring
   • Burrs and nicks
2. Install the following seals:
   • The 4th apply piston outer oil seal ring (26) on the 4th apply piston (25).
   • The 2-4 servo cover O-ring seal (27) on the 2-4 servo cover (28).
   • The 2nd apply piston outer (18) and inner (19) oil seal rings on the 2nd apply piston (17).
   • The O-ring seal (21) on the servo piston inner housing (20).
Fig 2: Servo Cushion Outer & Inner Spring With Retainer
Courtesy of GENERAL MOTORS CORP.
3. Install the servo cushion outer spring (16), the servo cushion inner spring (105) (model dependent) and the cushion spring retainer (15) in the 2nd apply piston (17).
4. Use the J 22269-01:  piston remover and compress the second apply piston assembly (17).
5. Install the second apply piston retaining ring (14).
Fig 3: Assembly Order Of 2-4 Servo Components
Courtesy of GENERAL MOTORS CORP.
6. Assemble the 2-4 servo components in the order shown: (12-15, 17, 20, 22-25, 28, 29).
Fig 4: 2-4 Servo
Courtesy of GENERAL MOTORS CORP.
7. Install the 2-4 servo assembly into the 2-4 servo bore.
Fig 5: Servo Cover Depressor
Courtesy of GENERAL MOTORS CORP.
8. Install the J 29714-A:  cover depressor.
Fig 6: Compressing Servo Cover
Courtesy of GENERAL MOTORS CORP.
9. Tighten the bolt on the J 29714-A:  cover depressor in order to compress the servo cover.
Fig 7: Servo Cover Retaining Ring & Servo Cover Depressor
Courtesy of GENERAL MOTORS CORP.
10. Install the servo cover retaining ring (29).