My kitchen slide rumbles on the way out; like a steel wagon wheel over a cobblestone street. I am very fearful that it will someday fail. I greased the timing shafts and sprayed dry lubricant on the metal rails, to no avail.
Because there is one hydraulic piston in the center, the timing shaft is supposed to keep the kitchen slide to go out and in evenly, without one end leading or lagging the other end. In theory, this is the way at least it is supposed to work. My guess is that my rumbling is caused by the slide binding at one end. This then puts a heavy torque on the timing shaft (like a stretched rubber band). This built up force then makes the binding side to give way which gives the rumble sound. This is repeated many times.
I had my sofa piston replaced and found that it was pushing at an angle because where it was attached to the frame. Could be the pushing angle of the piston is causing the binding,
That's my guess! - Hank
Gale & Hank- 2012 Berkshire 390BH