NAG1 Automatic Transmission - Disassembly

DISASSEMBLY

Special Tools:






NOTE: If the transmission is being reconditioned (clutch/seal replacement) or replaced, it is necessary to perform the TCM Adaptation Procedure using the scan tool NAG1 Only .

NOTE: Tag all clutch pack assemblies, as they are removed, for reassembly identification.










1. Remove the torque converter (1)(Figure 1).










2. Place transmission in a vertical position.
3. Measure input shaft end play as follows: (Figure 2)
a. Attach Adapter (2) to Handle (1).
b. Attach dial indicator (3) to Handle (1).
c. Install the assembled tool onto the input shaft of the transmission and tighten the retaining screw on Adapter (2) to secure it to the input shaft.
d. Position the dial indicator plunger against a flat spot on the oil pump and zero the dial indicator.
e. Move the input shaft in and out. Record the maximum travel for assembly reference.










4. Loosen adapter plug bolt (9)(Figure 3) and remove from the adapter plug (10) from the transmission housing.
5. Detach oil pan (5)(Figure 3).
6. Remove oil filter (4)(Figure 3).
7. Unscrew Torx(R) socket bolts (3) and remove electrohydraulic unit (2).
8. Air check the transmission. Air Checking Transmission Clutch Operation









9. Place the transmission in PARK to prepare for the removal of the output shaft nut.
10. Remove the nut, with a 30 mm 12 point socket, holding the propeller shaft flange to the output shaft and remove the flange.
11. Remove the transmission rear oil seal with a suitable slide hammer and screw.
12. Remove the transmission output shaft washer. Be sure to tag the washer since it is very similar to the geartrain end-play shim and they must not be interchanged.
13. Remove the transmission rear output shaft bearing retaining ring (1).










14. Position Bearing Remover (1)(Figure 5) over the inner race of the output shaft bearing (3).










NOTE: Due to production variations in the bearing, it may not be possible to slide the collar fully downward. It is only necessary to slide the collar down far enough that the fingers securely grasp the inner bearing race.

15. Slide the collar (3)(Figure 6) on the Bearing Remover (1) downward over the fingers (4) of the tool.










16. Remove the output shaft bearing (3)(Figure 7).
17. Remove the geartrain end-play shim from the output shaft. Be sure to tag the shim since it is very similar to the output shaft washer and they must not be interchanged.




Figure 8 - Remove K1, K2, and K3 Clutches





18. Remove the bolts holding the transmission housing to the converter housing from inside the converter housing.
19. Stand the transmission upright on the converter housing.
20. Remove the remaining bolts holding the transmission housing to the converter housing.
21. Remove the transmission housing from the converter housing.
22. Remove output shaft with center and rear gear set and clutch K3 (3)(Figure 8).
23. Remove thrust needle bearing (4) and thrust washer (5)(Figure 8).
24. Remove input shaft with clutch K2 and front gear set (6).
25. Remove clutch K1 (1).




Figure 9 - Remove Holding Clutch B1 and Oil Pump





26. Unscrew Torx(R) socket bolts (4) (Figure 9) and remove oil pump (6). Screw two opposed bolts into the oil pump housing and press the oil pump out of the converter housing by applying light blows with a plastic hammer.
27. Remove and discard the torque converter hub seal and the oil pump outer o-ring seal from the oil pump.
28. Unscrew Torx(R) socket bolts (1) (Figure 9) and remove multiple-disc holding clutch B1 (5) from converter housing. Screw two opposed bolts into the multiple-disc holding clutch B1 (5) and separate from the converter housing by applying light blows with a plastic hammer.
29. Detach intermediate plate (3) (Figure 9) from converter housing (2).




Figure 10 - Remove B2, B3, and Parking Gear





30. Remove multiple-disc pack B3 (2)(Figure 10) and spring washer (3) by removing snap-ring (1) in transmission housing. To facilitate removal of the snap-ring (1), compress the multiple-disc pack B3 (2). Note which clutch disc is removed just prior to the spring washer (3) for re-assembly. If the clutch discs are re-used, this disc must be returned to its original position on top of the spring washer.
31. Unscrew Torx(R) socket bolts (7)(Figure 10).
32. Remove multiple-disc holding clutch B2 (4)(Figure 10) from transmission housing. The externally toothed disc carrier for multiple-disc holding clutch B2 is also the piston for multiple-disc holding clutch B3.
33. Remove parking lock gear (5)(Figure 10).