Like Owen said, you have a later style pto. They engage when the plunger goes down. It is locked in by a internal piston and ball mechanism in the valve so therefore you do not need or want an overcenter linkage. If the pressure is not up to snuff they will not stay engaged and also the pressure is not adjustable with the spool like the older style pto's. It has a separate relief valve inside the pto. Those relief valves have a fine screen in them that plugs up and then you don't get good pressure for engagement. The pto may appear to run fine but it just won't stay engaged. Of course, other reasons for low pressure also.
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