Hi all the pto in my 6011 will just randomly stop, i thought the clutch for the pto had gone, so i split the tractor and yes it was worn away completely. so i put in a brand new clutch thinking this was the problem only to realise that after a half hour of work the pto stops working again, talk about being dissapointed. if i disengage the pto the engage it it will work each time for about 5 mins then stop. Please help any info greatly appreciated