- Feb 12, 2009
I just replaced my ST4000 wheel drive unit (black) with the Raymarine MKII wheel drive unit (grey). I used my same ST4000 control-display unit. After a couple of sea trials, it seems like the grey wheel drive unit is MUCH noisier....clicking, clanking sounds on the plastic.... and almost constantly adjusting the wheel slightly. Any ideas as to why it is so active, and more importantly, noisy?