I have not long bought some THK HSR25 carriages of ebay. 3 of them where hard to push and 1 made a regular clicking noise as you mentioned. I found that 1of the 4 bearings sets in carriage was the suspect and freed up the bearings by pushing them rapidly forwards and backwards. I know it sounds a bit of a bodge job but it seems to work. Probably benifit from the apllication of some more grease (use manufactures recommended). |