Hi, I have 1990s Case skid steer. The right side drive makes a bad noise (like the hydrolics on that side are locked) and has no power when pushing the lever back or forward, it happened all of a sudden. Changed the fluid, filters, checked the chains, lifted it up and ran it in the air and works fine, but as soon as any load is on it does this. If you move the levers together to go straight and do it very slowly you can get it to move very slowly. If you try to turn with the right side that when it feel like it's locking up. The other side works fine. Please help.