Clicking noise coming from right wheel area?

Hi All, I have a Hustler Diesel Z. I recently had a hydraulic line fail going to the left wheel motor. I was mowing a large field and did not notice until it started jerking. I shut it off and hauled it back to the garage with the skid loader. I had a hose made up and installed it and filled with 10W40 as stated on the reservoir. I have mowed with it for 8-10 hours since then but the left wheel motor is making a clicking noise when starting forward from a stop or climbing steep hills. It seems like the pump makes more noise on that side as well. I bought the mower last summer and supposedly both pumps were new at that time. I have mowed with it for 50 or 60 hours at least. Any ideas on what to do next for troubleshooting would be greatly appreciated. Thanks! Dave