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I just had the same issue with my B21 and the seal and the plug where leaking so I had to split the tractor to replace the seal and plug, the new plug is made of metal instead of rubber that would crack. I did it my self and it was a big job as the B21 has a extra sub frame and larger hydraulic...

Here is a picture of the drive shaft seal and the plug that was leaking.

They where on it when I purchased it and it has 2156 hours so must be a second set. I have attached the seal picture .

Here are a few pictures of the repair.

Parked my B21 in the shop last night to preform the maintenance on it today. Came out today to a puddle of hydraulic fluid under the tractor. It seems that grass/hay wrapped around the drive shaft from the clutch to the HST and took out the seal (at the clutch housing end.) Anyways, I'm going...

How many hours will a B21 engine last?