Ive been tinkering with the installation of the pushrods on my first trainer. (rudder, elevator). The push rods seem pretty resistant (is that a word?) to what I think they should be. hmmm... I know 0 about it so I have no idea how to tell whats too much load on like an average standard servo. Any thoughts..l THANK YA!

Tell us a little about the inside of the plane? Sharp bends can shorten your day. If you are using nyrod, it needs to feel free for best results. Let us know_bob

I had the same problem with my kadet 40. I ended up replacing the pushrods with a set I got from my local hobby shop. They worked 100X better. I cant remember what brand they were, but I'm sure someone can suggest something.

There are no real sharp bends. The rods are just normal rods with L/Z bends. I may be over reacting about them being too stiff. Could stiffness damage servos?

Yes, stiffness puts a load on the servos. You will draw more from the battery pack than you would if things are free moving. You will put more load on the servo bearings/bushings, motor, etc. If the control surfaces just about flop back and forth freely then there should be little resistance when the pushrod is connected to that surface, without the servo attached, of course. Except of course, the elevator working against gravity would show a little effort required.

Very simple thing to look at:
The servo should move as far and as quickly with the pushrod attached, as it does without the pushrod attached.

I am just about ready to install the pushrods in my LT-40, and am thinking that my rudder pushrod is going to have some resistance. Looking at the outer shell of the pushrod, in order to line in up (in a vertical direction) to my servo, I have to push it down a little. I am afraid this is going to creat resistance and put load on my servo. I am going to give it a try, but if I have problems, I may have to switch them out..

Take the pushrod off your surface and flex it. Is the resistance there or in the pushrod? If it is in the surface, could be the hinges out of alignment or glue in the hinges. If it is the pushrod, find out what is binding it and fix that. You don't want a lot of excess friction on either. The wind will cause pleanty when flying.

I had the same problem on a RTF trainer.
Inside the fuse the rod went inside a plastic tube.
I could see where it took a sharp bend.??BOW?
Also where the rod came out the side for the rudder,
came out to soon and that meant bending the rod to hook to the rudder horn.
I made an exit hole closer to the rudder and then shortened the rod.
No bends or bows and the servo swings as smooth as glass.
Jusl like TATTOO said (Very simple thing to look at:
The servo should move as far and as quickly with the pushrod attached, as it does without the pushrod attached) and thats just what I have now.