Encyclopedia of Anchoring (CA06114E)

KELLY-BAR ADAPTER When ordering tooling for a new truck, the Kelly bar should be measured across the flats to establish the proper size between the truck Kelly bar and CHANCE Kelly-Bar Adapter. CHANCE number P630012HD Kelly-bar adapter has a 2⅝” hex inside diameter. This particular adapter is often confused with a P630011HD Adapter with 2½” hex. If a P630012HD is used on a 2½” hex, the Kelly bar will tend to round out the hex socket of the Kelly bar adapter. In this case, the pin holding the Kelly bar adapter to the Kelly bar will begin to take up load and elongate the hole. This will eventually split-out the top of the Kelly bar adapter (see photograph below). RETAINING PIN The CHANCE Retaining Pin (right) holds the Kelly bar adapter to the Kelly bar with a loose fit so the Retaining Pin will not take up load. The Pin consists of a bent arm and klik pin. This gives a positive connection at both ends of the pin to protect operators from accidental pin ejection due to drive-train torsional forces. CHANCE has a complete line of retaining pins to replace bolts previously used to secure tooling to anchor and Kelly bar adapter to Kelly bar. Retaining Pins are now included with all new Kelly bar adapters, square-shaft anchors and bumper-post installing tools. Before any anchor installation, always check output bolts to ensure they are tight. Lost or damaged bolts can cause failure at or below the anchor torque rating or contribute to damage elsewhere on the output string. Check all tools and parts for wear or damage and replace as necessary. SUMMARY During anchor installations maintain adequate down pressure and keep anchor-drive wrench in alignment with anchor to prevent uneven wear or damage to the tool. Misalignment puts an extremely high stress on the end of the wrench where the wrench fits over the anchor. This can possibly cause the drive tube to split on the end. Check all tools and parts for wear or damage and replace as necessary. Order replacement parts from CHANCE. Properly used and with minimal service requirements, CHANCE tools will give extended service.

Photo 2 shows drive tube damage resulting from poor wrench alignment during installation of anchors. Photo 3 shows an undamaged drive tube.

Photo 2

Photo 3

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Abused Kelly bar adapter hole elongation caused by the retaining pin picking up torsional load from the Kelly bar. This is an indication the hex shape of the Kelly bar adapter is being rounded off.

Unused Kelly Bar Adapter

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