No PTO brake

Thanks in advance.

If the clutch pack is in good shape, simply hooking up an implement (with the engine off of course) will usually be enough to keep it stopped. If it will drive an implement (say, a rototiller pulled out of the ground) with the control handle in the off position, either the handle is not adjusted properly, or there is clutch pack damage (e.g. warped clutch plates).

Tuf

I found that when I rebuilt those trannies that if I set the bearing preload for the PTO clutch pack to the tight end of the specs, that the shaft would stop when the oil was warmed up and the engine at idle. Sometimes the hold was so tenuous that the shaft would take off again if you revved the engine up.

Bottom line is this: 99-plus percent of those SOS transmissions will spin the PTO with NO load attached. The degree (torque value) to which they will spin a load depends on many factors, among them being oil viscosity, temperature of the oil, condition of the clutch pack (plates flat or warped), speed of the engine, and the tightness (pre-load) of the bearings.