Awful screeching is not good, something is dry or in a bind or both.  "If" you're handy with tools, check out the maintenance PDF's at Richard Polt's website.  They're called "Ames Training Manuals" and are factory reprints for basic maintenance and tear down/ assembly.  Some machines have a definite order to carriage adjustment.  I learned this on my Royal HH.  I could be the spring motor the drawband is connected to is in need of lubrication.  Whatever is done, NEVER force a part or function.

Grease is on these typers, in my experience, is also NEVER used.  It attracts dirt and dust and you end up with a kind of lapping compound that just wears stuff out faster than if they were left alone. ( Lapping compound is what rock hounds use to polish rocks, or machinists and mechanics use to "wear" parts together for fit and tolerance.)  Light oil sparingly used on only certain places is all these typers need.

If there are any doubts in your mind on what to do or how, it's time for the respected typewriter shop. Everything is a system of function in these machines. Once out of order, something else can go wrong.