the fan on the vacuum cleaner motor serves as a load without the brush belt-the fan should be a sufficient enough of a load on the motor to prevent racing or overreving.I am not famaliar with the motors used in washers out side the US-do these motors have an internal fan-if so should be safe to run it without a belt.If it DOESN'T have a fan-then wouldn't do it.and Vacuums--such as direct air uprights-have a fan inside the motor for cooling-this serves as a min load,too.