I'll try and be there.

I’ll try and call you later.

He should try and email me.

By using and, you're saying that you'll try (we don't know what you are trying) plus:

I will try AND I will be there.

I will try AND I will call you later.

He should try AND he should email me.

Instead of the word “and” we need to use the infinitive's to (to replaces and)

I’ll try to be there.

I’ll try to call you later.

He should try to email me.

"You can live a completely fulfilling life if you only ever say "try to predict.""

For me this is more than enough thank you very much to everybody..:)

You can live a completely fulfilling life if you only ever say "try to predict."  In fact, try and predict is considered pretty casual and maybe a little uneducated.  They both mean the same thing.

There are certain situations where you would actually use that construction, but it doesn't mean the same thing.

Consider this situation:

Tommy: Hey, Mom.  What happens when I stick this fork into the electrical outlet?
Mom:  Try and see.

This does not mean "try to see" like the example above means "try to predict."  It means "Try sticking the fork into the outlet and see what happens."