BH 600/750 fin wistle & Mach end cycle noise

[SKTeK315]

Hey everybody. Gotta constant wistle from the fin. The longer the copy run the louder it gets. Removed all fin covers & lubed all bush. & bearings. Even some clutch & motors' bushings. Still wistles.
Also getting a heavy squeek when Mach stops but fin still putting out prints. Help with noise.
Thanks

[minimerlin]

What finisher model do you have? Most squeecks seem to be caused by the white plastic rollers that run with spring pressure. The shafts usually need cleaned/lubed.

[SKTeK315]

600/750 gin wistle

Turns out it's not fin. It's drum blade on drum. So I moved it away half way to buy me time. Got 2 Mach with same problem.
750, I changed blade. Not oem. Noise came back fast. I came back with whole process unit & swapped blade ass'y but kept new blade. Same wistle. Manualy, almost impossible to turn. The other unit no problem turning manualy.
I swapped process units & done.
Is it something that deforms in clng unit or blade.
Ps. The unit today, had a very old burnt out blade so I don't think oem or none oem doesn't matter. I don't know.