15. Center Support Reconditioning Repair

Removal and Measurements

^ Tools Required
- J 8059 Parallel Jaws
- J 41681 Clutch Spring Compressor
- J 8001 Dial Indicator Set
- J 26900-13 Magnetic Base





1. Remove the planetary gear snap ring using the J 8059.





2. Remove the planetary gear (1) from the center support (2).





3. Measure the B1 brake piston stroke using J 8001 and J 26900-13:
^ Place the J 8001 plunger on the B1 brake piston.
^ Apply 392-785 kPa (57-114 psi) of air pressure into the extreme left overdrive case fluid passage.
^ Measure the B1 brake piston stroke.
^ B1 brake piston stroke (standard): 0.63-1.73 mm (0.025-0.068 inch)
^ If the B1 brake piston stroke is not within specifications, replace the brake flange or the disc.





4. Remove the 3 rear sealing rings (1) from the center support.





5. Remove the B1 brake clutch snap ring (2) from the center support (1) using a flathead screwdriver.





6. Remove the following 131 brake components from the center support:
^ The flange (1)
^ The clutch discs (2)
^ The clutch plates (3)





7. Remove the B1 brake piston return spring snap ring from the 131 brake piston retainer using J 41681 and a hydraulic press.





8. Remove the B1 brake piston return springs from the center support (1).

Important: When using compressed air to remove components, air pressure should not exceed 98 kPa (14 psi).





9. Apply low pressure compressed air to the extreme left fluid passage (1) in order to remove the 131 brake piston.
10. Remove the O-rings from the 131 brake piston.





11. Measure the B2 brake piston stroke using J 8001 and J 26900-13:
^ Place the J 8001 plunger on the B2 brake piston.
^ Apply 392-785 kPa (57-114 psi) of air pressure into the second left overdrive case fluid passage.
^ Measure the B2 brake piston stroke.
^ B2 brake piston stroke (standard): 1.01-2.25 mm (0.040-0.088 inch)
^ If the B2 brake piston stroke is not within specifications, replace the brake flange or the disc.
12. Remove the B2 brake snap ring from the center support.
13. Remove the following B2 brake components from the center support:
^ The flange
^ The clutch discs
^ The clutch plates





14. Remove the B2 brake piston return spring snap ring from the B2 brake piston retainer using the J 41681 and a hydraulic press.
15. Remove the B2 brake piston return springs from the center support (1).

Important: When using compressed air to remove components, air pressure should not exceed 98 kPa (114 psi).





16. Apply low pressure compressed air to the second left fluid passage (1) in order to remove the B2 brake piston (2).
17. Remove the O-rings from the B2 brake piston.





18. Perform the following steps in order to inspect the planetary sun gear (2) operation:
18.1. Hold the B2 brake hub assembly (1).
18.2. Inspect that the gear locks when turned in the clockwise direction (3).
18.3. Inspect that the gear turns freely in the counter clockwise direction (4).





19. Remove the B2 brake hub assembly (1) from the planetary sun gear (2).





20. Remove the two planetary sun gear sealing rings (2).


Installation Procedure

^ Tools Required
- J 8059 Parallel Jaws
- J 41681 Clutch Spring Compressor
- J 8001 Dial Indicator Set
- J 26900-13 Magnetic Base

1. Install the two planetary sun gear seal rings.
2. Lubricate the seal rings with A/T fluid.
3. Install the B2 brake hub assembly to the planetary sun gear.





4. Install two new O-rings (1)to the B2 brake piston.
5. Lubricate the O-rings with A/T fluid.
6. Install the B2 brake piston to the center support.
7. Install the B2 brake piston return springs to the B2 brake piston.

Important: Do not align the snap ring opening with B2 brake piston return spring retainer lug (2) during the next step.

8. Install the B2 brake piston return spring snap ring to onto the B2 piston return spring retainer using J 41681 and a hydraulic press.
9. Install the B2 brake plates and discs in the following order:
9.1. The plate
9.2. The disc
9.3. The plate
9.4. The disc
9.5. The plate
9.6. The disc





10. Install the B2 brake flange (1) with the chamfered side facing the disc (2).
11. Install the B2 snap ring into the center support.





12. Measure the B2 brake piston stroke using J 8001 and J 26900-13:
^ Place J 8001 plunger on the B2 brake piston.
^ Apply 392-785 kPa (57-114 psi) of air pressure into the second left overdrive case fluid passage (1).
^ Take the measurement.
^ B2 brake piston stroke (standard): 1.01-2.25 mm (0.040-0.088 inch)
^ If the B2 brake piston stroke is not within specifications, disassemble and inspect.
13. Install two new O-rings to the B1 brake piston.
14. Lubricate the O-rings with A/T fluid.
15. Install the B1 brake piston to the center support.
16. Install the B1 brake piston return springs to the B1 brake piston.
17. Install the B1 brake piston return spring snap ring onto the B1 brake piston return spring retainer using J 41681 and a hydraulic press.
18. Install the B1 brake plates and discs in the following order:
18.1. The plate
18.2. The disc
18.3. The plate
18.4. The plate
18.5. The disc
19. Install the 131 brake flange with the chamfered side facing the disc.
20. Install the 131 snap ring into the center support.





21. Measure the B1 brake piston stroke using J 8001 and J 26900-13:
^ Place the J 8001 plunger on the B1 brake piston.
^ Apply 392-785 kPa (57-114 psi) of air pressure into the extreme left overdrive case fluid passage.
^ Take the measurement.
^ Specification B1 brake piston stroke (standard): 0.63-1.73 mm (0.025-0.068 inch)
^ If the 81 brake piston stroke is not within specifications, disassemble and inspect.
22. Install the three rear seal rings to the center support.
23. Lubricate the seal rings with A/T fluid.
24. Install the planetary gear to the center support.
25. Install the planetary gear snap ring using J 8059.