A750E Automatic Transmission System

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: PRECAUTION

1. PRECAUTION

NOTICE:
* Perform Reset Memory (AT initialization) when replacing the automatic transmission assembly, engine assembly or ECM A750E Automatic Transmission System.
* Perform Registration (VIN registration) when replacing the ECM Programming and Relearning.

2. CONNECT BATTERY NEGATIVE TERMINAL

(a) Connect the cable to the negative (-) battery terminal and run the engine at no less than 2000 rpm for 1 minute.

NOTICE:
If the engine exceeds 2000 rpm, the clutch is automatically disengaged by the compressor protection control system.

3. PRECAUTION FOR DISASSEMBLY AND REASSEMBLY

CAUTION:
When using compressed air, always aim away from yourself to prevent Automatic Transmission Fluid (ATF) or kerosene from spraying on your face.

NOTICE:
* The automatic transaxle is composed of precision-made parts, necessitating careful inspection before reassembly because even a small nick could cause fluid leakage or affect performance.
* The procedures are organized so that you work on only one component group at a time. This will help avoid confusion with similar-looking parts of different sub-assemblies being on your workbench at the same time.
* The component groups are inspected and repaired from the converter housing side.
* Whenever possible, complete the inspection, repair and reassembly before proceeding to the next component group. If a defect is found in a certain component group during reassembly, inspect and repair this group immediately. If a component group cannot be assembled because parts are being ordered, be sure to keep all parts of the group in a separate container while proceeding with disassembly, inspection, repair and reassembly of other component groups.
* When changing the automatic transmission fluid, use Toyota Genuine ATF WS or equivalent.
* All disassembled parts should be washed clean, and compressed air should be blown through any fluid passages and holes.
* Dry all parts with compressed air. Never use cloth.
* The recommended ATF or kerosene should be used for cleaning.
* After cleaning, the parts should be arranged in the order they were removed for efficient inspection, repairs, and reassembly.
* New discs for the brakes and clutches that will be used for replacement must be soaked in ATF for at least 15 minutes before reassembly.
* All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be coated with ATF prior to reassembly.
* All old gaskets and rubber O-rings must be replaced.
* Do not apply adhesive cement to gaskets and similar parts.
* Make sure that the ends of the snap rings are not aligned with any cutouts. Also make sure that snap rings are correctly installed into the grooves.
* If a worn bushing is to be replaced, the sub-assembly containing the bushing must also be replaced.
* Check the thrust bearings and races for wear or damage. Replace if necessary.
* Use petroleum jelly to keep parts in place.
* When working with seal packing material, perform the following:
Using a razor blade and gasket scraper, remove all old seal packing material from the gasket surface.
Clean all components thoroughly to remove all foreign matter.
Clean both sealing surfaces with a non-residue solvent.
Apply seal packing material in a continuous line approximately 1 mm (0.04 in.) in diameter on the sealing surface.
Reassemble parts within 10 minutes of applying seal packing material. Failing to do so will require the seal packing material to be removed and reapplied.