We have a 1997 VF 6 that in the last year has developed an ear piercing scream, squeal but continuous. If you remember the old generation TVs and their high pitch noise, just amplify that 50 to 100x and you get the idea. Or if you can't picture that, just imagine an extreme case of tenitus.
In the lower RPM range of 3000 and below life is good. By 5000 RPM the noise is very loud and remains about the same as far as pitch and volume from that point all the way to 10,000. You have to wear ear plugs just to run operate the machine and it has become the most hated machine in the shop for this reason.
I am 90% convinced it is the transmission gear play making the noise. I have already tested the belts as a cause by tigheten and loosing them and nothing I did with the drive belts would change the noise.
Does anyone else there have experience with this problem or have suggestions?