To replace the cartridge for the F802-2, please refer the following link and the steps below.
F802-2 parts breakdown
1. Unscrew set screw and pull handle off (part #12)
2. Unscrew part # 13. Parts 14, and 15 will now pull off.
3. Unscrew part # 16 with wrench.
4. Pull out cartridge.
5. Clean seating and replace with new cartridge.