I made a slide hammer out of a pair of vice grips. Use all thread where the adjustment bolt is on the vice grips. Then just clip the vice grips on the seal and tap it out.
The chain case on my bobcat is getting full of hydroulic fluid. I'm assuming is from one of the motor. You think installing new seals would fix the problem
That is what mine was doing. You need to check your case drains also. If they are plugged it will over pressure the seal. If you don't have a service manual I would get one.
Just enough to get below the seal. You will have oil from the hydraulic tank in the case drain line. It will have to have a plug in it or be drained. I used a vacuum pump and a carboy to evacuate the fluid and reuse it.