Pump Assembly

Pump Assembly









Disassembly

1. Using the Bushing Remover and Slide Hammer, remove and discard the pump seal.





2. Remove and discard the pump stator support seal.





3. Remove and discard the 2 seals.





4. Remove and discard the pump outer diameter square-cut pump seal.





5. NOTE: Note the location of the bolts for assembly.

Remove the Overdrive (O/D) piston return spring.






6. Remove and discard the O/D (Overdrive) piston.





7. Remove bolts and separate the pump control body from the pump gear body.





8. NOTE: If the pump gears or plate show any signs of wear or scoring, a new pump assembly must be installed.

Remove and inspect the plate.






9. NOTICE: Do not remove the stator support from the control body. This can distort the surface of the control body.

Remove the converter clutch control valve, cooler bypass valve and thermostat valve, converter pressure limit valve, converter anti-drain back valve and the main regulator valve.
1. Remove the retainer clip with a small screwdriver, then remove the main regulator plug, spring and valve.

2. Remove the retainer clip with a small screwdriver, then remove the converter anti-drain back plug, spring and valve.

3. Remove the retainer clip with a small screwdriver, then remove the converter pressure limit plug, spring and valve.

4. Remove the retainer clip with a small screwdriver, then remove the thermostat plug, spring and valve.

5. Remove the cooler bypass valve.

6. Remove the retainer clip with a small magnet or pliers, then remove the converter clutch control plug with shuttle valve, spring retainer and valve.






10. NOTICE: To avoid part damage and loss of function, do not clean the pump thermostat with mineral spirits or solvent.

Remove and inspect the inner and the outer gerotor gears.
- Clean all pump parts except the thermostat, in solvent.

- Dry the parts with compressed air.

- Inspect the pump gears, faces, gear teeth, pump housing and mating surfaces for damage or scoring.

- If any parts are damaged or worn, install a new pump.






11. Inspect the converter hub bushing. If scored or excessively worn, install a new pump. Note the orientation of the notch in the bushing. It must face up.





12. Inspect the front input shaft bushing. If the bushing is worn or scored, install a new pump.





13. Inspect the rear input shaft bushing for wear. If scored or worn, install a new pump.





14. Inspect the following:
- All valve and plug bores for scoring or damage.

- All passages for obstructions.

- Mating surfaces for burrs and scoring.

- All springs for distortion.

- When dry, check all valves and plugs for free movement in their respective bores.


Assembly

1. NOTE: All the valves must drop into their bores freely without hanging up.

Install the converter clutch control valve, cooler bypass valve and thermostat valve, converter pressure limit valve, converter anti-drain back valve and the main regulator valve.

1. Install the main regulator boost valve spring, plug and install the retainer clip.

2. Install the converter anti-drain back valve, spring, plug and install the retainer clip.

3. Install the converter pressure limit valve, spring, plug and install the retainer clip.

4. Install the thermostat spring and valve.

5. Install the cooler bypass valve, plug and clip.

6. Install the converter clutch control valve, spring, plug and install the retainer clip.






2. NOTE: Prior to installation, lightly lubricate the pump gears with transmission fluid.

Install the gerotor gearset with both dots facing up.






3. Using the Depth Micrometer, measure the pump gear-to-pump body clearance.





4. Install the separator plate.





5. NOTE: Inspect mating surfaces of the pump body and the control body to make sure they are clean and free of nicks and burrs.

NOTE: Note the location of the Transmission Fluid Pump Alignment Pins. The Transmission Fluid Pump Alignment Pins should be installed at the 1 o'clock and 7 o'clock position with the pump filter inlet sump at the 6 o'clock position. The Transmission Fluid Pump Alignment Pins should move freely when installing the band strap.

Using the Transmission Fluid Pump Alignment Pins and Transmission Pump Banding Tool, assemble the control body and stator assembly onto the pump gear body.






6. NOTE: Make sure that the outer edges of the pump body and the outer bolt holes are aligned during assembly.

Assemble the pump and loosely install the bolts. Check that the outer edges of the pump body and the bolt holes are aligned.

- Tighten to 31 Nm (23 lb-ft).






7. Lubricate with transmission fluid and install a new O/D (Overdrive) piston.





8. Install the O/D (Overdrive) piston return spring.
- Tighten to 29 Nm (21 lb-ft).






9. Install new pump seals.





10. Coat the seal with transmission fluid and install the pump outer diameter square-cut pump seal with the white stripe facing out.





11. Using the Front Pump Fluid Seal Installer, install a new pump seal.





12. Install a new pump stator support seal.





13. NOTE: Late build models have no tabs on the No. 2A O/D (Overdrive) sun gear thrust bearing. Install the No. 2A O/D (Overdrive) sun gear thrust bearing with the dark side facing up.

NOTE: Lightly lubricate the thrust washer and the bearing with petroleum jelly to hold them in place during assembly.

Install the No. 1 pump thrust washer and the No. 2A O/D (Overdrive) sun gear thrust bearing.