The ballscrews on all 3 axes will require occasional grease to maintain smooth operation. The official product to be used is "Sinopec Multipurpose Lithium Grease (Natural) NLGI 1", with the following information from the MSDS:
A similar lithium grease can be used as a replacement. Apply it to the threaded rod evenly and move the ballnut along the raceway several times. Do not apply too much grease.
Turret Lock Lubrication