It's important to keep all the joints well supplied with grease, and there are many of them. The FEL on a BX24 has 9 or 10 zerks (grease fittings) and these should be lubricated every 10 hours. The backhoe has even more zerks. [TBN] Greasing the tractor
Broken Zerk Use a tool such as an "easy out", zerk extractor or "grease fitting tool" to remove the remainder of the broken fitting. Like this Zee Line Grease Fitting Tool from Northern Tool. Turn counter-clockwise and be careful to avoid damaging the thread. New zerks are inexpensive.