I have assembled a bike with new Shimano Nexus 3 (SG-3C41) internally geared hub. In the lowest gear the hub is silent. However in the middle and highest gear it makes a clicking noise similar to free-wheel mechanism while not pedaling. The clicking is faster in the highest gear at the same speed.
Have I made an error in assembly or is it normal for this model?
Can I somehow get rid of this clicking or at least make it quieter by greasing some parts?
Side note: I couldn't fit the original grips in my setup, so I have Sram 7.0 rear 8 gear grip shift controlling the hub. I tried setting the grip between the gears, so I'm almost certainly sure this isn't the cause of clicking, but just in case...