Alrighty thanks for the replies, done the antifreeze, the pump is hydraulic so but it’s only set so it maxes around 500 rpm, but it’s not a constant slows and speeds up with the tractor at the headlands so that could be the problem, the oil is always kept topped upI always blip pto in and out few times when not been used for while rather than flat out straight away when everything is dry. Antifreeze in over winter as well helps I think.