[Crackling sound from stepper motor]

http://www.ebay.com/itm/3D-Printer-Accessory-DIY-Ultimaker-2-Timing-Belt-GT2-200-Timing-Belts-GT2-610-/221827052011?hash=item33a5ec31eb

should i replace the belts aswell?

Also the fan is making hell of a lot noise.

[Crackling sound from stepper motor]

Hello, so i got this printer for work. I noticed that my printer does alot of sound compared to ohter UM2-s

Anyway i think it hasnt got any maintence for a while. I changed the nozzle setup, so that is fine. But about the noise. I figured it comes from the right back motor. I loosend the belt and the sound dissapeard when i moved it by hand(the motor was moving). From that i thought when the motor gets a bit of preassure it starts crackling. Should i buy new sets of belts and replace the motor? And if so can somebody link me some good motor.

Video with sound https://www.dropbox.com/s/exuii4kbuitnjgc/20151010_020650.mp4?dl=0