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REV: 04-29-25 LF <br />AIR HORN BUTTON <br />An air horn button shall be provided at the turntable control console. <br />HYDRAULIC AND ELECTRIC SWIVEL <br />Hydraulic power to the turntable hydraulic circuits shall be provided through a three-port, high <br />pressure hydraulic swivel permitting 360 degrees continuous rotation of the turntable. <br />Electric power to the turntable electric circuits shall be comprised of a minimum of twenty-two (22) <br />ring collector assembly, permitting 360 degree continuous rotation of the turntable. <br />ELEVATION SYSTEM <br />Two (2) double-acting lift cylinders shall provide smooth, precise elevation from 7 degrees below <br />horizontal to 78 degrees above horizontal. The lift cylinders shall be attached to a triangulated <br />lifting configuration which distributes equal force to each side of the aerial base section. The <br />triangulated lifting configuration shall apply all lifting forces in a plane parallel to the vertical center <br />line of the base and side rails. <br /> <br />The lift cylinders shall be pinned to the front structure of the turntable weldment and within the <br />upper section of the triangulated lifting structure one (1) each side of the ladder. <br />The lift cylinders shall have a 6” internal diameter, 3-1/2” diameter cylinder rod and a 44.50” <br />stroke. The cylinders shall be equipped with integral cylinder holding valves to prevent the unit <br />from lowering should the charge lines be severed at any point within the hydraulic system. Units <br />that do not use holding valves on the cylinders shall not be acceptable. A hydraulic holding valve <br />shall be provided in the elevation circuit to retain the aerial ladder in its bed when the vehicle is in <br />motion. <br />The lift cylinders shall be provided with both rod and piston “hydraulic cushions”. The cushions <br />shall serve to decelerate the cylinder near the end of its stroke resulting in a smooth stop at full <br />cylinder stroke. <br />AERIAL INTERLOCK SYSTEM <br />A limit switch at the aerial travel support shall be provided to prevent operation of the <br />outriggers/stabilizers once the aerial device has been elevated from the nested position. <br />EXTENSION/RETRACTION SYSTEM <br />A full hydraulic powered extension and retraction system of the ladder shall be provided through <br />dual hydraulic cylinders and cables, each capable of operating the ladder in the event of failure <br />of one of the systems. <br />The extension/retraction cylinders shall be equipped with integral (on the cylinder) holding valves <br />to prevent the unit from falling should the charge lines be severed any point within the hydraulic <br />system. <br />The extension cylinders shall be provided with both rod and piston “hydraulic cushions.” The <br />cushions shall serve to decelerate the cylinder near the end of its stroke resulting in a smooth <br />stop at full cylinder stroke. <br />ATTY/AGR.2025.089/Fire Apparatus Solutions (Purchase of Spartan-LTC 105' TDA) (Page 136 of 150)