Originally Posted by beam2050

one heck of a pump!

ok, dead in the center between your suction line and your pulley there is that square hole you can see the shaft. on the pump side of that hole there is a large nut with notches for a c style spanner wrench. your graphite packings are under that. by tightening up that nut you tighten up your packings as they wear. there should be a place near that nut to grease your packings. loosening that nut allows you to slide the nut back on the shaft and you can put in a new packing or replace the packings by pulling them out with a corkscrew type puller.

couldn't find a break down of that pump. so I am going by what I know. most pumps I am familiar with have two nuts to tighten the packing flange. but this one looks like it has one huge nut that takes a spanner which is more stupid proof. it looks like your packing nut is almost bottomed out so it will be needing some packing soon.

packing puller

graphite packing