After hours of troubleshooting and research, I am at my wits end diagnosing my out of balance problem. I replaced a leaking water pump on my washer and ever since, the tub is spinning out of balance. It shakes violently during any spin cycle.

Here is what I know:

Model: Whirlpool LLR9245BQ1
Age: Not sure; inherited it through home purchase. 4-7yrs?

1. Washer operated fine prior to changing out the water pump. It did not shake during the spin cycle.
2. I did lay the unit on its back and side while accessing the pump.
3. All pads and suspension springs are intact and not worn or loose.
4. The suspension plate is in alignment, sitting where it should be.
5. The internal balance ring around the washer tub still contains liquid.
6. The washer sits level and sturdy on the floor during operation.
7. Self-leveling rear feet work fine.
8. The washer will spin out of balance even with no load (no water or clothes).

I hesitate to replace any parts just yet because the washer ran fine before I laid it on its back to replace the washer pump. I am completely stumped and am desperate for any further direction. If anyone has further suggestions on what to try, it would be greatly appreciated.