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When some hammers get enough mileage on them to warrant retirement and under certain driving conditions, the contractor may have trouble keeping the ram keys tight. Usually under these circumstances, the contractor will weld the keys to the ram and worry about the consequences later. The drawing above shows a better way of keeping the keys tight and allows for quick and easy retightening during the job.

Driven Pile Manual Volume 1a
Driven Pile Manual 1b
Driven Pile Manual 2