TC18 hole identification help.... Missing plug?

[brenth561]

So I noticed this the other day on my tractor due to a black oil like Mark around it. I assume it would have a cover that I must have lost. Anyone know what it's for or something I could plug it with?

 

[guyw]

Mine has a rubber disc shaped plug there. I would check out Messicks and see if you can find it on a parts diagram.

Guy.

 

[brenth561]

Mine has a rubber disc shaped plug there. I would check out Messicks and see if you can find it on a parts diagram.

Guy.

Thanks for the reply. I did find the cover and replaced it. My concern now is about dirt and water getting in there while running it a few hours before seeing it was gone. Is there supposed to be oil in there? I'm thinking I should change all my fluids.

 

[rayikeo2]

It may just a cover for some type of service adjustment that is located back behind the hole, like the clutch adjustment or something similar. The hole may be so the tool can be inserted to make and adjustment. A mechanic should be able to tell you or a service manual. I doubt any fluids will need to be changed. If it was that important it would have a threaded plug instead of a rubber cover.
Looking at my shop manual, a 1980 1700 model, it says there is an access hole for tractors that have a dual clutch. The hole is for adjustment of the dual clutch. For tractors that do not have a dual clutch, the hole is there anyway. This is probably what your hole is. A tractor mechanic can verify this for you if I am correct.