Sit in the recliner. Lean backward to recline the backrest. Pull the handle or push the button that flips the foot rest up.
Roll the recliner over so the underside is facing upward. Remove all covers that hide the framework, according to your recliner's instruction manual.
Tighten all loose bolts and nuts that hold the framework together, using a pair of crescent wrenches.
Spray all of the springs, hinges, nuts, bolts and pivoting hardware with an antiseize lubricant. Wipe off the excess lubricant with a rag to keep it from dripping on the underside of the chair.
Roll the chair upright. Sit down in the chair, and then incline and recline the backrest several times until the squeaking stops. Close and open the footrest several times until the squeaking stops. If the squeaking persists, flip the chair over and retighten and lubricate the hardware again.