IH: Oiling & Lubrication

Trans/Primary Oiling

Primary Oil Level Plug / bolt

57-70 (3728), 1/4“x20x1/2” hex bolt.
71-85 (2420), 1/4“x20x3/4” posidrive bolt.
Any 1/4'x20 bolt will do as a replacement.
If the threads are jacked up when this bolt is removed, you can drill / tap to next size up. 1)

1982 Primary Oil Site Plug 2)

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