Guide :Measuring Tools & Sensors : Automatic Transmission And Engine Oil Pressure Tester
Allison MD 3060 Transmission Leak
Right side above the valve body appears to be a breather, consisting of a bolt, washer cap, and rubber gasket under the cap and may be spring loaded? This leaks when parked and not running, but dries up when running. I have tightened the bolt but still leaks when not running. The bolt only tightens so far, and the washer will spin freely all the time, and seems to have some spring type cushion built in. Trans is not overfull with fluid.