Hey all. Just purchased a B2401 Gear driven. Not my first tractor but it is my first gear driven. Noticed today when I disengage the PTO on the bush hog, I hear a metal clicking sound as the bush hog winds down. Never heard this on my HST tractor w/ a separate PTO switch. Sound is not coming from the bush hog, it's coming from the tractor's PTO shaft area. Normal ??