, including the dry/flush knob, needs lubrication. If you only want to do it once every 6 mo-a year (depending on how much use the toilet gets), buy a tube of SuperLube thick grease, which you can find at Home Depot or Ace Hardware
for about $6.95. Remove the screws that hold the pump
on the base and lift
the pump enough to let you stick the nozzle on the tube up into it...give it a healthy squirt--about a tablespoon...replace the pump, then pump few times to spread the grease all over the inside of the pump. You're done. That SHOULD also put enough grease into the dry/flush housing to make turning the knob a lot easier. If it doesn't, open up the dry/flush assembly (see the exploded drawing in the PHII owners manual here PH II Owner’s Manual
and squirt a little grease into it.