Join Date: Aug 2006
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The big 6 sided hex nut, maybe 1/2" wide, is what holds or is suppose to hold the stuffing box in position and is the lock nut. The stuffing glands are inside of the stuffing box and are squeezed against the threaded shaft that in your picture is on the right hand side with a hose clamp arround it.
The threads should not rotate at all.
The lock nut and the stuffing box both have the same pitch threads as the stationary shaft does. It's really a very straight forward affair.
I would start by cleaning up the threads and taking some sort of a weeping compound that will assist in breaking the locknut free from the stuffing box.
Watch those knuckles!