My caution was for Ford tractor PS pumps in general, not 555B models specifically. I'm not as up on idustrial models, but I do know that later 7610s (late 80's) had the relief valve in the motor, so again, one needs to be careful and not assume that all Ford PS pumps can be safely dead-headed. Same goes for engine-mount hydraulic pumps.
I realize that most guys on this board will not run out and buy a flow meter, however it's also safe to say that there are a lot of half worn out Ford PS pumps out there that would in fact pass the factory-prescribed dead-head test (especially with cold oil) that might cause a fellow to start chasing their tail in other areas.
I realize that the dead-head test is spelled out in the factory repair manual, but this is one instance where the factory method is definitely not good enough for me.
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