The power take-off (PTO) system on a used tractor requires close examination. Engage both 540 and 1,000 RPM settings to verify smooth operation without severe vibration, squealing, or clutch slippage. Check the PTO shaft splines for rounding, twisting, or metal fatigue caused by past shock loads from heavy rotary cutters or high-capacity forage equipment. https://tractorfactory.weebly.com/blog/check-hydraulic-systems-transmission-fluid-on-used-tractors