The pump just needs lubrication, but NOT lock carbon or WD-40. There are two ways to lube a toilet: 1.Flush a tablespoon of veggie oil
down it every couple of weeks...or 2. Replace the thick teflon or silicon grease that was in it when left the factory--a 10 minute job that only needs to be done once a season in your neck of the woods.
Go to Ace Hardware
or Home Depot and buy a tube of SuperLube thick grease (SuperLube has full line of liquid and spray lubes...you ONLY want the stuff in the tube). Remove the screws that hold the pump onto the base and lift
the pump enough to stick the tube nozzle up into it. Give it a healthy squirt--about a tablespoon...Replace the pump, pump the toilet a few times to spread the grease all over the inside of the pump, and you're done.