There is a hole at the bottom of the bell housing. The hole is there to protect the clutch from oil and coolant if anything goes wrong inside, and condensed water from air. Yours is probably clogged.
Normally, there is a cotter pin hanging in the hole. It is there to clean the hole when it wiggles around. That does not work as expected. Better enlarge the hole with a drill to double the size. Park the tractor slightly uphill, clear the hole with a suitable tool and get the mess out. Dust, debris and oil can make like a fibre mat at the bottom of the bell housing, so you need to poke around in there to make sure that you have a clear passage for the leaking fluid.
In the future, poke the hole from time to time to make sure it is open. You can also flush the inside clean from the timing inspection hole. Make sure that the cover for the inspection hole is in its place and secured with the screw when you are finished.
Remember to always park the tractor slightly uphill, to be sure to get fluids out of the bell housing.
If the leaking continues through the weep hole, you need to split the tractor and get it fixed. A few drops is not that critical, but it will not get better over time.
Operator's Manual:
www.ntractorclub.com/manuals/tractors/Operators%20Manual%20All%20Purpose%20and%20LCG%20Tractors%202000,3000,4000,and%205000.pdf
Shop Manual:
Ford 2000-3000-4000 (3-cyl ,1/65 -12/74) Shop Manual...
Covers: All Purpose Agriculture (2100, 3100 and 4100) LCG (2110 and 4110) Rowcrop (4200) 4000 SU (4140) The old version of this pdf (ShopManual_Ford_2_3_4000.pdf) did not have all pages from the manual. This second version is updated and complete.
www.tractorforum.com
Parts List in a PDF:
Online Parts Lists:
New Holland 3000 - SERIES - 3 CYL TRACTOR(01/65 - 12/74) Parts
New Holland 3000 - SERIES - 3 CYL TRACTOR(01/65 - 12/74) Parts
www.messicks.com
