Originally Posted by .Outlaw.
It's completely normal. Depending on what you have your tension settings as, it will continue to do it or will stop after a little bit (then will start again after you activate it by shooting, repeat). I think if you have it on tension setting 1, it won't do it at all... It's been a long time since I've used a VLo so I don't remember the exact settings, but I do know that humming is completely normal.
That's correct, with setting # 1, it will not hum at all. With all of the other settings, the motor will pulse, putting varying degrees of tension on the clock spring. This is to provide some speed if you suddenly need to shoot a fast burst; it provides tension on the stack before the motor kicks in to full speed. However, the higher the setting, the louder the sound, and the more it drains battery life.
With setting number 1, it simply turns the motor on when the eyes detect a gap in the ball stack, just like a Revvy, only with force. It's important to note that the loader has the SAME top speed on setting 1 as it does on setting 8 (full power.) It just takes it a little longer to go from zero to 15bps on setting 1. That said, it takes like 3/4 of a second to accelerate that fast, as opposed to instantly on setting 8.
The reason I posted all that is that it's kind of a pet peave of mine - people turning their Vlocities all the way up and then whining about the noise and poor battery life. They just don't understand how the thing works. The thing works fine on setting 1, and you'll have none of those problems, and for most people, will supply adequate firepower off the break. (Battery life isn't great, but A LOT better on setting 1.) The Vlocity is one of the nicest loaders I've ever owned, design-wise. Unfortunately, I fried two boards in mine and gave up on it.