Hello everyone,
I have a quad mast that drifts only in the middle of it's travel.( load or no load ). It does not drift, when I extend it up high, or lower it to the first stage. I at first suspected, that because they run around the wharehouse with the masts raised ( rug poles ) all the time, that the middle of the secondary cylinders must have excessive wear ( internally ). A gate valve test shows no drift what so ever while gated closed. Any ideas? I am baffled by this. I thought I really had a good idea with the worn cylinder theory.