A pivot pin assembly for a tree shaker pivotally attaches the clamping arm to the stationary arm. Each end of the cylindrical pivot pin extends outside of a cylindrical bore of the clamping arm. A longitudinal load member extends through an aperture in the stationary arm and into an aperture in the cylindrical pivot pin. An axial load may be applied to the longitudinal load member which compresses a plate of the stationary arm against the cylindrical pivot pin, but without compressing the stationary arm against the clamping arm. This configuration allows substantial torque to be applied to the longitudinal load member, which reduces play between the stationary arm and the clamping arm without inhibiting the free rotation of the clamping arm. Application of this torque eliminates radial and vibratory movement in the shaker head, which otherwise cause damage to the components of the shaker head.
