Press any of the end caps back into the tube openings they were covering. The end caps may fall out of the tubes due to the vibration of the machine.
Apply a thin layer of petroleum jelly to eliminate noises from the axle tube. Use the jelly around both ends of the horizontal bar across the vertical handles, and around the bar where it connects to the personal computer in the middle of the handles.
Squirt a small amount of WD-40 to eliminate noises made by the cable holders. Apply the oil to the upper cable holders on the left and right sides of the machine, under the rear frame grips, and on the lower cable holders attached to both foot platforms.
Tighten each of the screws if parts of the frame start to come apart or if you hear a clicking sound when using the machine. With a Phillips screwdriver, tighten the screws along the base of the frame and on the foot platforms. Use an adjustable wrench on all of the nuts on the frame. The motion of the machine may loosen the screws and nuts.