At our allotment we are now on our second Yale Combination padlock. Its the very common one, Model Number Y160. Their behaviour is the same: just jamming up and only opening with a huge effort.
3in1 oil does not work. Can anything be done with them ?
Claims to be waterproof but really sounds like it isn't. £13 is pretty cheap, I guess it will be Chinese and not likely to be the best materials. I've found the Squire 4 dial padlocks at about twice the price to be pretty reliable.
I use keyed alike padlocks at our stables and so usually have a spare or two. If one goes sticky, I put in a spare and flush out rust/dirt with WD40 or similar and then submerge the lock in ordinary engine or gear oil for a few days, that usually gives them a new lease of life.
I have a magnificent bronze Yale keyed padlock on my workshop. This looked pretty old when I bought the house 33 years ago, and it still looks much the same. I don't think I've ever needed to lubricate it. (It gets wet when the wind is in the wrong direction).
"The tumblers also became very stiff to turn after exposure to the first rain shower and a few weeks later the combination setting disc mechanism jammed solid."
While graphite alone is always recommended by locksmiths for that (very good) reason, in my experience it is fine in completely dry environments, but it doesn't work for padlocks that can get rained on.
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