Backflushing and Cleaning

Note: When internal wear or damage has occurred in the transmission, metal particles, clutch plate material or band material may have been carried into the torque converter and oil to air (OTA) fluid cooler. These contaminants are a major cause of recurring transmission concerns and must be removed from the system before the transmission is put back into service.

1. A new OTA fluid cooler must be installed under the following conditions:
- major metallic failure
- multiple clutches or clutch plate failure
- sufficient component wear that results in metallic contamination
2. Install a new OTA fluid cooler.


Transmission Fluid Cooler - Backflushing and Cleaning
1. Carry out backflushing with a suitable torque converter/fluid cooler cleaner. Test the equipment to make sure that a vigorous fluid flow is present before proceeding. Install a new system filter if flow is weak or contaminated.
2. To aid in attaching the cleaner to the transmission steel cooler tube, connect two additional rubber hoses to the transaxle end of the steel transaxle cooler tube as follows:
1 Connect the cleaner tank pressure tube to the steel transaxle cooler return tube.
2 Connect a tank return hose to the steel transmission cooler pressure tube. Place the outlet end of this hose in the solvent tank reservoir.
3. Turn on solvent pump and allow the solvent to circulate a minimum of five minutes (cycling switch on and off will help dislodge contaminants in cooler system).
4. Switch off the solvent pump and disconnect the solvent pressure hose from the transaxle cooler return tube.
5. Use compressed air to blow out the cooler(s) and tubes (blow air into the transaxle cooler return tube) until all solvent is removed.
6. Remove the rubber return hose from the remaining steel cooler tube.