Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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What has happened is most likely an air pocket in the system that is keeping the unit from operating properly. What you will need to do is jack the rear tires up off of the ground, start the machine and operate the control levers forward and backward slowly to allow the air to be purged from the system. It may take a little while to get the system fully functional again, I have seen it take as long as thirty minutes to purge. It is not a huge deal, it happens all the time when the fluid level gets low or you have drained or changed the fluid. It will begin to start working again once you get the air purged out of the system.
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Both of the hydro release valves or dump valves need to be in the drive position otherwise you are wasting your time trying to purge the system.
The repair was made on the right side and you did not touch or bother the left side so it stands to reason that the right side may not be working due to an air pocket in the system of lines. Make sure that the hydro dump valves are in the drive position, if they weren't in your prior attempt to purge the system then retry purge with them in the drive position and see what happens. If you are still having trouble with it the only other thing that I could suggest is to remove one of the hoses and fill it with fluid while turning the rear wheel slowly this will purge any air out of the system and should get it working again.