Posted 7/22/2026 07:19 (#11706926 - in reply to #11706689) Subject: RE: Massey 8780xp combine rotor gear box vibration
NW Iowa
bad balance.
Either threw some weight off or they didn't do it right.
Check rotor off for missing knife or
Pull the covers off, put in N,
rotate the rotor by hand and see if spins on its own to
a certain spot
Add weight to opposite side of rotor
Massey 8780xp combine rotor gear box vibration
