This system is used for excavation. The piston is not designed with details due to lack of time (sealings etc).
The piston is Φ50, the rod is Φ25 and works with a pump of 125MPa.
This system may easily remove iron filings (when the buckets are full, the weight of the filings is 850kg).
Finally, the system of the buckets and the shaft weighs 180kg.