hydraulics

IS3100Z--- Right side drive hydraulics making a rapid tapping noise. I can feel the tapping in the hydraulic lines when moving the drive lever forward or back. Tapping changes from one line to the other depending on which way I move the lever. There is no tapping with the lever centered. When first starting the mower, it moves as it should for about a minute, then rapidly goes to not moving the right wheel at all. With the machine off the floor, I can roll the wheel and hear the tapping. There is a lot of "free wheel"(easy roll) back and forth compared to other side. This is a rebuilt wheel motor with 3 hours on it. I purged the right side 3 times to be sure there was no air. Do I have a bad rebuilt wheel motor or is it possibly the pump? Thank you, gregjo1948

http://service.mtdproducts.com/Training_Education/769-00966.pdf I know this is not your Ferris, same principle. Start at page 4 process of elimination.

I would put rear of mower on jack stands & try bleeding procedure per manual again.

mechanic mark said:

http://service.mtdproducts.com/Training_Education/769-00966.pdf I know this is not your Ferris, same principle. Start at page 4 process of elimination.

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Thank you for your reply. I don't have the gauges to run these tests. I was hoping someone could recognize the symptoms and verify whether it's the wheel motor or the pump. gregjo1948

BAD PUMP!!!!!!!!!!! I didn't get all the contamination out the pump when I installed the rebuilt wheel motor. In hindsight, I should have torn the pump apart and thoroughly cleaned. I removed the lines, pump, and reservoir but only rinsed the pump with fuel oil. I found a lot of small metal flakes and dust from the broken shaft from the wheel motor in the pump. I still don't know how the customer managed to break the shaft. I have learned a costly lesson!! gregjo1948