Pump Assembly
Pump Assembly
Special Tool(s)
Disassembly
1. Using the special tools, remove and discard the front pump seal.
2. Remove and discard the front pump stator support seal.
3. Remove and discard the two seals.
4. Remove and discard the pump outer diameter square-cut front pump seal.
5. NOTE: Note the location of the bolts for assembly.
Remove the overdrive piston return spring.
6. Remove and discard the overdrive piston.
7. Remove bolts and separate the pump control body from the pump body.
8. NOTE: If the pump or plate shows any signs of wear or scoring, a new pump assembly must be installed.
Remove and inspect the plate.
9. CAUTION: Do not remove any of the remaining cup plugs unless directed to do so in other steps. 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 thermostat plug, spring and valve.
5 Remove the cooler bypass valve.
6 Remove the retainer clip with a small magnet or screwdriver, then remove the converter clutch control plug with shuttle valve, spring retainer, and valve.
10. Remove and inspect the inner and the outer gearotor gears.
^ Clean all pump parts 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 should 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 gearotor gears with clean automatic transmission fluid.
Install the gearotor gearset with both dots facing up.
3. Using the special tool, measure the pump gear to pump body clearance.
4. Install the separator plate.
5. CAUTION: Prior to pump assembly, make sure all cup plugs are installed.
CAUTION: 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 alignment pins. The alignment pins should move freely when installing the band strap.
Using the special tools, assemble the control body and stator assembly onto the pump 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 the bolts.
7. Lubricate and install a new overdrive piston.
8. Install the overdrive piston return spring.
9. Install new pump seals.
10. Install the pump outer diameter square-cut front pump seal with the white stripe facing out.
11. Install the a new front pump seal, using the special tool.
12. Install a new front pump stator support seal.
13. 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 overdrive sun gear thrust bearing.