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REV: 04-29-25 LF <br />HYDRAULIC SYSTEM FILTRATION <br />Outgoing and return line filtration shall be provided. The pressure and return filters shall be easily <br />accessible for maintenance. <br />Outgoing filtration shall be in the form of a pressure line filter installed between the hydraulic pump <br />and entrance to any system components. The filter shall have an absolute rating of ten (10) <br />microns. The pressure filter shall have a bypass circuit protected by a 50-psi check valve, which <br />shall be installed around the pressure filter. The pressure line filter shall be required even if a <br />suction line filter is provided in the reservoir due to the suction line filter's inability to trap <br />contaminates entering the system. <br />A filter condition indicator shall be provided. <br />The return line flow shall be filtered by means of a return line filter. This filter shall have an absolute <br />rating of ten (10) microns. <br />EMERGENCY HYDRAULIC PUMP SYSTEM <br />In the event of failure of the main hydraulic pump or vehicle engine, the unit shall be equipped <br />with an emergency hydraulic pump. <br />The pump shall be plumbed into the hydraulic system and shall be electrically driven from the <br />chassis batteries. The emergency pump shall be capable of limited functions of the ladder and <br />outriggers to stow the unit. The pump shall be controlled from a switch located at the emergency <br />override station unless otherwise specified. <br />The emergency pump shall have a separate hydraulic oil supply line, attached directly to the <br />hydraulic oil reservoir. A shutoff valve shall be provided and a check valve shall be incorporated <br />on the pressure side of the pump. <br />HYDRAULIC HOSE, TUBING AND FITTINGS <br />All hydraulic steel tubing, hydraulic rubber covered wire-braided hoses, and hydraulic <br />fittings/adapters shall have a minimum burst pressure rating of four times the operating pressure. <br />Hoses and tubing shall be properly sized to minimize heat buildup during extended periods of <br />operation. Hoses and tubing shall be properly sized to minimize flow restrictions. <br />All hydraulic hose shall have a tube and cover constructed of Nitrile elastomers and shall have <br />braided/spiral wire reinforcement capable of maintaining a 4:1 safety factor in all areas of the <br />hydraulic system. The hose shall meet the appropriate SAE performance specifications: 100 R2 <br />or 100R12. <br />AERIAL HOUR DISPLAY <br />The actual hours that the aerial device is in motion shall be displayed digitally on the turntable <br />control console display screen to aid in scheduling preventative maintenance as outlined in the <br />operator's manual. <br />ATTY/AGR.2025.089/Fire Apparatus Solutions (Purchase of Spartan-LTC 105' TDA) (Page 129 of 150)