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Basically by doing that (as in post #4) you will actually SEE one gear (PTO input) moving freely just a tiny bit, until it starts turning the other gear (rev. idler) - in both directions.
Ideally, backlash should be ±0.01" (general rule of thumb); and be asured: that is VERY visible! Also...
Totally agree with Dan!
And if you don't want to pull that nicely sealed PTO inspection cover or even open the tranny's top cover... there is a little trick that always worked well for me: one can actually see both gears (reverse idler and PTO input) and how much play there is, if a (AAA) mini-...