Collective Friction
My recollection is that for any SA model incorporating adjustable collective friction, with the friction full on the pilot must be able to move the collective ( hydraulics on ). There may have been some maximum force measurements, but I can't recall them. For some models, e.g., the S-70, a minimum friction is specified, like 3.5 lbs. The S-61 AFCS collective channel was made to function with near zero friction and the minimum levels there are like a pound or less.
All of that info should be in your maintenance manual, and also incorporated in the maintenance test flight procedure.
Thanks,
John Dixson