Transmission Cooler: Service and Repair

^ Tools Required:
- J 35944A Oil Cooler and Line Flusher
- J 35944-20 Flushing Solution

1. Remove fill cap on J 35944-A and fill with 0.6 liter (20 oz) of J 35944-20 flushing solution.
^ Do not overfill.
^ Follow manufacturer's suggested procedures for handling solution.
2. Install cap on J 35944-A and pressurize it to 550 to 700 kPa (80 to 100 psi).
3. Connect J 35944 to the transaxle end of the oil cooler pipe that feeds the BOTTOM fitting of the oil cooler.
4. Connect the discharge hose to the TOP oil cooler pipe, and clip the discharge hose to oil drain container.
5. With the water valve on J 35941A in the "off" position, connect water supply to the tool.
6. Turn on water supply.
7. Flush transaxle fluid by opening water valve to the "on" position for about 10 seconds.

Important: If water does not flow through the cooler, the system is completely plugged. Do not complete the flushing procedure. Replace the cooler and/or cooler pipes as required.

8. Close water valve and clip the discharge hose to a 5-gallon pail. Cover pail with a shop towel to prevent splash.
9. Turn water valve to the "on" position and depress the trigger to mix flushing solution into the water flow. Use the bale clip provided to hold the trigger down.
10. Flush cooler with water and solution for 2 minutes. During this flush, attach an air supply to the air valve located on the tool for 3 to 5 seconds every 15 to 20 seconds. This will create a surging action to ensure complete cleaning.
11. Release trigger and turn off water valve.
12. Disconnect both hoses from the oil cooler pipes.
13. Reconnect the hoses to the pipes opposite the initial flush to do a backflush.
14. Repeat Steps 9 and 10.
15. Release the trigger and allow water to rinse for 1 minute.
16. Turn off water valve.
17. Attach air supply to the air valve and dry the system with air until no moisture is seen leaving the discharge hose.
18. Connect the cooler feed pipe to the transaxle.
^ The 4T65-E cooler feed is the TOP connector at the transaxle.
19. Clip the discharge hose to the oil drain container.
20. After filling the transaxle with fluid, start engine and run for 30 seconds to remove residual moisture from the oil cooler. At least 2 quarts of fluid should flow during the 30 second period. If fluid flow is insufficient, check it by disconnecting the feed line at the cooler and observing the flow with the engine running.
^ Insufficient Flow: inspect the transaxle for causes.
^ Sufficient Flow: inspect cooler pipes, fittings and repeat cooler flushing procedure. If the flow is still insufficient, replace the cooler.
21. Remove the discharge hose and reconnect the cooler pipes.

Adjust
^ Fluid level.