As mentioned, there is a drain plug
in the center section of the transmission
, and as I recall
also an oil
drain plug in the rear planetary section of the transmission. Check them.
Fill the transmission to the proper level using the dipstick, then place an oil
pad under the casing to see if you can find out where the oil is going. If the oil level is dropping you should be able to see where the leak is coming from.
If the level is dropping, but there are no obvious external leaks
, there is another possibility. Located in the front end of the input shaft is an aluminum
plug with an O ring which prevents oil leaking past the needle bearings and out of the transmission. You can see this plug in the photo
attached to this thread. If this plug/Oring is damaged you could be leaking oil there and it would disappear into the engine
crankcase without being seen.