Generally, you should drain your machine when you are repairing the pumps or any hoses leading to or from them.

Place a bowl next to the machine.

Pull the drain filter hose out of its slot in the chassis enough to lay over the bowl.

Remove the plug at the end of the drain filter hose to release excess water into the bowl.

During reassembly, re-plug the drain filter hose and thread it back through its slot in the chassis.