The oil causes some "coupling" of the rotating flywheel and the stationary pressure plate, sort of like a very inefficient torque converter. Without any oil, it drags less.
Your transmission brake must not be adjusted properly. When the transmission is out of gear, the transmission input shaft can rotate easily and the oil will get it spinning along with the engine if the clutch brake doesn't have enough friction to stop it when you push forward.
The oil pump circulates oil through the clutch plates and keeps things cool.
The brake would prevent the gears from grinding when engaging. If the clutch will not disengage at all I would suspect the interlock mechanism adjustment but I can't explain why it would act differently with or without oil unless it just enough to change clearances.
The two section scavenge/oil supply pump operation was described in the service manual info I sent before which I still have on file. Here it is again. Be sure suction screen is clean.
The brake would prevent the gears from grinding when engaging. If the clutch will not disengage at all I would suspect the interlock mechanism adjustment but I can't explain why it would act differently with or without oil unless it just enough to change clearances.
The two section scavenge/oil supply pump operation was described in the service manual info I sent before which I still have on file. Here it is again. Be sure suction screen is clean.
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