Hi,
The Cub operator's manual can help you learn about maintenance that the Cub needs.
If you knew the year of the Cub, I could post a link to one here.
Cub owner's and operator's manuals are at the upper left of the page, at Quick links, then go to PDF Manuals.
The experts on here recommend people read it. It has lots of info about operation, maintenance, and lubrication. There is a table of contents usually on page 1 or 2.
It shows how Cubs originally looked in it.
There are also manuals at the top of the page at Cub Info, then go to Rudi's Manuals.
It shows the electrical system that Cubs originally had.
Cubs made before mid 1964 originally had 6 volt, positive ground electrical systems.
After mid 1964 they have 12 volt negative ground systems.
The Touch Control uses Case IH Hy-Tran fluid. It is sold at Case IH dealers.
There are other brands, be sure it works with IH hydraulic systems before buying one.
The manual tells how to check and change the Touch Control fluid, and remove the air from the system.
Be sure to check the fluid with the arms in the rear, or down position, the manual says to also.
I would check or change all the oils before using the Cub. Using it with low oil in a gear housing can damage the parts in the housing.
There are 3 separate gear housings, with 3 separate oil levels to check, in the rear area of a Cub, the transmission, and 2 final drives.
The transmissions in Cubs commonly get water in them, from rain, or condensation inside the housing over time.
The air cleaner is an oil bath air cleaner. Dirt that is sucked in settles to the bottom of the oil cup. It should have clean, light motor oil in the oil cup to work right.
There is a search box at the top of the page, to the right of the Farmall Cub, you can find info in posts that have been made.