2026 Naval Maintenance and Mechanical Tools Practice Test – Complete Exam Prep Guide

The pulling action comes from a central screw pressing against the shaft while two jaws grip the gear or pulley from opposite sides. A universal gear puller is typically built with two jaws because this simple, compact arrangement provides a stable, symmetric grip and enough force to pop the part off the shaft when the screw is tightened. The design is versatile and covers a wide range of sizes by adjusting how far the jaws open, making two jaws the common configuration for a universal variant. Three-jaw pullers exist and are useful for self-centering on round parts, but the standard universal type is usually two-jawed.