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I have had to replace a bearing in an S-16 with a Vickers pump. I have lost all power to the wheels. I have the rear wheels up on stands and they will not power up. The oil filter was filled up prior to starting, the rotor had a few drops of oil in it also. The swash pump housing has filled itself up full. I have cracked all the hoses with no success. Anyone know how to diagnose this problem?

Purging Air from Hydraulics
1. Raise rear wheels off ground. Brace with jack stands.
2. Put bypass valves so it freewheels.
3. Get on mower start it and release the brake.
4. Push drive lever full forward for 10 seconds the full reverse for 10 sec. Do this 10 times for forward and 10 times for reverse alternating between each.
5. Return levers to the parked position and set brake. Turn off the mower. Move bypass valve bake to normal operation.
6. Get back on the mower and start it. Do step #4 again.
7. Return levers to the parked position and set brake. Turn off the mower.
8. Return mower to ground.
9. Test for proper working. If not repeat.
10. Check oil level and fill.

Problem solved. Bad internal o ring.

Glad You found it.