Sounds like your machine could use a good cleaning.  A light solvent such as mineral spirits should do it.  I have used charcoal starter fluid and even diesel fuel (all are perfectly safe if you use them in a well-ventilated area).  You can use transmission fluid to lubricate stubborn joints.  Most of all, use the ever-lovin' tar outta that thing.  Type, type, type!!  Exercise loosens up machines and people.