Hi,
The Cub operator's manual can help you learn about maintenance that the Cub needs.
Below is the 1950 Cub operator's manual. The experts on here recommend people read it. It has lots of info about operation, maintenance, and lubrication. There is a table of contents on page 1.
It shows how Cubs originally looked in it. The lube section begins on page 14.
http://farmallcub.com/rudi_cub/www.clea ... index.htmlIt shows the electrical system that a 1950 Cub originally had.
Cubs made before mid 1964 originally had 6 volt, positive ground electrical systems.
The Touch Control fluid mentioned in the manual for the Touch Control, was changed later to use 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.
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 search for info that is on this website that people have posted.
Mht is talking about flushing the cooling system above, not the oil, or inside the crankcase.
The 15W-40 motor oil is good to use, the engines are not new, and thin motor oil can cause low oil pressure, if the engine is worn some.
You may need a little thinner oil if you are going to use the Cub in cold Winter temperatures.
Good luck with the Cub.