Encyclopedia of Anchoring (CA06114E)

TOOL MAINTENANCE

Anchor Tools Require Regular Upkeep As with most mechanical devices, CHANCE anchor installing tools periodically require maintenance checks to assure peak performance. TORQUE INDICATOR In the case of the Shear-Pin Torque Limiter, (see drawing below or photograph at right) you should be able to rotate the tool shear halves independently from one another using a smooth-turning action. If rotation cannot be made by hand or if movement is rough, disassemble to check the thrust bearing, washers and pin for wear. If the halves are dull, they need to be sharpened by surface grinding. A local machine shop can perform this service. When reassembling the indicator, coat thrust bearing pin, washers and shear surface with grease. Secure top shear half to the lower half by tightening the center bolt snugly. Back off one roll-pin slot and lock with roll pins. Check cap screws for wear and replace if necessary. Torque cap screws to minimum of 60 ft.-lbs. All output string bolts used in the drive-train system should be checked for tightness. Loose or damaged bolts may fail at or below the anchor’s torque rating and contribute to damage elsewhere within the tool assembly.

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When a torque indicator is used in the wrench system, it is positioned between the Kelly bar adapter and locking dog assembly.

CHANCE digital torque indicator uses no shear pins.

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