Although I totally concur with those who choose to replace a Jabsco manual pump instead rebuilding it, rebuilding a toilet does NOT have to be an "icky" job. It's only an icky job if:
a) you don't do it as scheduled preventive maintenance--which you get to do on YOUR terms at YOUR convenience--resulting in the need for a repair, which NEVER happens when it's convenient. It's called PREVENTIVE maintenance because prevents the need for 99% of repairs. An "icky job" is the price you pay for neglecting it.
b. Even if you do decide to rebuild before neglect leads to catastrophic failur, you don't take the time to prep for the job before taking anything apart...and thorough prep is 90% of the key to the success of ANY job.
Prepping to rebuild a toilet starts with thoroughly rinsing out the pump and plumbing--the whole system--with plenty of clean water BEFORE taking anything apart...clean water isn't "icky." Put plastic garbage bags or disposable aluminum pans under hose connections to catch any spills. (Warming hoses with a blow dryer makes them easier to remove and replace). Have a couple of rolls paper shop towels (super heavy duty paper towels, all I've ever seen are blue) handy...you'll need 'em. Use the phone in your camera to take photos of the parts you're replacing to make sure you get the new oriented correctly. Don't forget to put a healthy squirt of thick teflon or silicon grease into the pump to lube the toilet last thing before you put it back on the base. When putting the discharge fitting back on the pump after replacing the joker valve, be careful not to OVERtighten the bolts/screws. The flange on the joker valve is the gasket that seals the fitting connection. You want that connection to be leak proof, but over-tightening the screws/bolts will put puckers in the flange, actually CAUSING it to leak. So start with snug, then only a quarter turn or even less of each screw if necessary close off a leak.
I'm not associated with Raritan any way.