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Lyle, probably the best way to tell how much slippage you had is to sniff the PTO oil,, if smells considerably burnt those clutch disks are burnt (how much you won�t know without disassembly & inspection).. You ask,, Quote:--� If you replace disks, do both the drive and driven types need to be replaced� --That depends on the amount of slippage or damage incurred.. In most cases if the lined plates are burnt the steel plates will be warped & have bluing or purple spots burnt into them.. If there�re damaged or warped they will also need replacing.. Do an adjustment on the PTO clutch & see if it still slips,, if so try a different PTO oil ( I personally like Deere Hy-Guard).. If you had (have) a premium quality modern motor oil in that PTO there is probably plenty of friction enhancers & modifiers in that oil & that can promote clutch slippage under sustained heavy load.. If it still slips suspect burnt plates or sacked out clutch engagement springs due to the heat of slipping.. Clooney
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