To engage the PTO (power take-off) on a Massey Ferguson 165, you first need to make sure the filter is in the “On” position and the PTO knob is in the “Disengaged” position. Then, press down on the clutch pedal and move the PTO knob to the “Engaged” position. You should hear the PTO start to engage. If it does not, make sure to check the fluid and filter levels as they may need to be topped up.