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Meccano Steam Shovel
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The biggest hint for getting this working correctly is to install a modern 3v motor and battery pack driving instead of the steam engine, and disconnect the steam drive. Then, once you've carefully checked and oiled the geartrain you can easily run in the mechanism over a couple of hours without worrying about the engine. If you can't run it with a small 3v motor then the steam engine won't manage it either.
Here's a video of the beast in action! This was taken in winter with a very cold wind, which reduced the power available as the meths burner could only just keep the pressure up. But it worked well enough.