The way I remember is to wipe off each zerk fitting first, so you don't push dirt in with the new grease, then add grease until the boot begins to bulge or you see fresh grease if no boot - then wipe off the old excess grease. But that was nearly 10 years ago.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy