gun maintenance

First, can you give some specificics? Just "tell me about maintenance" is pretty vague and encompasses a very wide range of information. Are you having any issues right now, or are you just asking about basic preventative maintenance?

If your gun is fuctioning properly now, the old saying "if it ain't broke,don't fix it" applies. These are fairly simple and robust devices that run a long time without much being done to them.

You do want to try and keep it clean and lightly lubricated. It's a mechanical device made largely of metal, so don't take a garden hose to it.

Your barrel can accumulate gunk over time even if you haven't broken any balls, so a good periodic cleaning there is a good idea. I just soak a napkin or cloth in some denatured alcohol and jam it through with a coated gun rod a couple times.

The "ball detent latch" can lose tension and need replacing, which is very cheap and easy, but requires opening the gun. (This is the little orange thing that keeps the ball from rolling out of the gun and down the barrel).

Personally, I'm a fan of "polishing the internals", which requires opening the gun and taking some steel wool and polishing smooth the inner-tube area where the two bolts rub back and forth. You'll see that this area comes from the factory very rough to the touch, and a few seconds with some steel wool will make this area baby-smooth, and minimize the friction on these vital O-rings.

Without rambling any further, I suggest you go to You-tube and search "Tippmann98 maintenance". There are many helpful videos that demonstrate the disassembly/assembly, and other maintenance tips. These guns really are pretty simpe to work on, hope this was useful, good luck !!