automotive torque converters do not have a drain plug. Special draining instructions may be found in the manufacturer's repair manuals. Before performing this operation, clear it with your maintenance supervisor.)

Refilling the Transmission. - Reinstall the transmission oil pan, the oil plug, and fill tube. Fill the transmission with the fluid prescribed by the manufacturer to the proper level. With the brakes applied, start the engine and let it idle for a couple of minutes. Move the gear selector through all positions several times, allowing the fluid to flow through the entire hydraulic system to release any trapped air. Return the selector lever to park or neutral and recheck the fluid level. Bring the fluid to the proper level. Run the vehicle until the operating temperature has been reached, and check for leaks in the process. At operating temperature, recheck the fluid and adjust the level, as necessary.

CAUTION

Overfilling an automatic transmission will cause foaming of the fluid. This condition prevents the interred working parts of the automatic transmission from being correctly lubricated and causes slow actuation of the bands and clutches. Eventual burning of the clutches and bands results. DO NOT OVERFILL AN AUTOMATIC TRANSMISSION.

TROUBLESHOOTING. - Good troubleshooting you know what you are doing when you troubleshoot an automatic transmission, you should be able to pinpoint the problem before you remove it from the vehicle. In some cases, you may be able to make the repairs without removing the transmission.

Next, before troubleshooting the transmission, make sure the engine is in good running condition. An engine that is not operating properly will not allow the transmission to function normally.

Locate the transmission serial number (fig. 7-22). This is important for finding the correct troubleshooting information and in obtaining repair parts.

The information (table 7-2) included here will assist you in locating and correcting the troubles that could develop in the Turbo Hydra-Matic Model 400 series automatic transmission, a type found throughout the NCF in M-1008, M-1009, and M-1010 series trucks.

NOTE

A malfunction may have more than one probable cause. Complete all the tests and inspections for each cause to find the correct cause.

Keep in mind that it is impossible to list each and every malfunction and its possible corrective action in this training manual. The problems listed are the most common. If you have a problem occurring in your transmission that is not listed here, see your supervisor practices save a lot of time and money for the Navy. If for advice.

Figure 7-22. - Typical example of the data plate location on an automatic transmission.