My pump growls too. (A206), which screw please?
After removing the front cover, get down on the ground and look at the center of the pump straight on at eye level. The screw will be staring directly at you. Use turbine oil ONLY to lubricate!!!!!!
I usually remove the screw, put the machine in spin mode, and squirt turbine oil through the hole after the machine has reached its maximum 618 RPM spin speed. I've actually been able to revive pumps that were on the verge of locking up by using this method.