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Loose Column Keys can shorten the life of a Hammer considerably. When the Base Keys are loose the Hammer is subject to misalignment and breakage. Loose Keys will slip into the center of the Base and be struck by the Ram Point, breaking the Base.

The above drawing shows a quick and easy way to keep these keys tight and to retighten as the job progresses.

Weld the Ring to the Keys as shown. Then when the Key needs to be tightened, drive a "U" shaped washer between the Ring and Base. Drive as many washers as necessary to keep the Key tight. Then tack weld the washers to the Ring or Key, not the Base.

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