977 20A clutch oil

I doubt grease is going to be a good solution. The clutch has an oil pump to circulate oil through the clutch disks keeping them cool and clean. There is no filter though, just a coarse suction screen on the pump pickup.

Either use motor oil like the manual says or i like a universal tractor hydraulic transmission fluid like Chevron 1000 or the "303" fluid. You could go for a higher quality JD HyGard or CaseIH HyTran for at least twice the cost. Since there's no filter I think the better plan would be to use cheaper fluid and change oil more often than buying the best there is and never changing it.

Hi Team,
modern engine oils have different slippery additives in them that are much different to the whale oil additive that was used when the original oil requirements were written for these machines.

Check and clean, if needed, the Flywheel Clutch Housing breather, as the clutch warms during operation pressure in here could force oil out into the engine via the non-positive rear main crankshaft seal where the oil scroll draws oil back towards the engine during operation.

As CCJ suggests to go with the Universal Tractor Trans oil would be the best solution-- better still, where is the oil going--do you have a visible leak that could be fixed easily.

Also be aware that oil can transfer into or out of the clutch compartment from the engine in a steep nose down or up position when operating on steep inclines.

Although not your problem, you should be aware that Clogged D318 engine crankcase breathers can cause engine oil to transfer back into the clutch compartment as the rear main seal is simply a scroll thread like affair and so not positive.

Cheers,
Eddie B.

ok i'll skip the grease, do they want this checked with machine running or off?

Hi Team,
my Grey D6 8U-9U Tractor OMI, Form No FEO12692-12, dated 06/61, says with "Engine Stopped"
Naturally do this on level ground-side tilt away from the stick would show low oil level and vice versa.
Cheers,
Eddie B.