If you find the motor noise is too high, please let us know the target. And record the motor‘s rated working current and max working current. We will take the following actions to reduce the noise:

A: Calculate the exact torque your product need with the current data you recorded. Then reduce the DC motor speed and gear ratio or choose different motor and gear ratio.

B: Plastic gear and the helical gear.

C: low noise grease

D:DC motor without vent-holes.