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7.1.P. - Page 16 <br /> HYDRAULIC SYSTEM <br /> 9 n The hydraulic system shall be adequate for use within the design requirements of the sweeper. The system shall <br /> include a minimum 25 gallon reservoir, sight gauge, temperature gauge, 80 mesh suction strainer, spin -on <br /> replaceable full flow oil filter, hydraulic cylinders, gutter broom drive motors, control valves, relief valves, oil <br /> cooler, hydraulic hoses and standard fittings. <br /> !� tJ The hydraulic pump shall be engine mounted, gear driven by the auxiliary engine. <br /> Fl Pressure shall be 2500 PSI maximum for gutter brooms and 1500 PSI maximum for pick -up head and dump door. <br /> BLOWER <br /> 1J' Heavy duty, wear resistant, high strength cast aluminum alloy turbine type open face blower computer balanced <br /> within 4 grams shall be provided to create air pressure and suction. <br /> 4f Blower wheel shall be covered with wear resistant rubber for long life. <br /> J Blower shall be mounted on self - aligning anti - friction bearings, sealed and lubricated for life. If bearings are not <br /> sealed, then an automatic lube system must be furnished. <br /> L! Blower shall be driven from PTO off auxiliary engine by heavy duty power belt which shall be adjustable for <br /> tension. <br /> JJ Blower housing shall be a bolt on design and shall be lined with a bolt -in wear resistant, replaceable rubber liner <br /> for long life. <br /> 9 fJ Blower not to exceed 3000 RPM to insure smooth efficient performance. <br /> PICK - UP HEAD <br /> £4 A spring balanced all steel fabricated pick -up head with maximum length and width of 87" x 30" I.D. shall be <br /> provided. <br /> M fr The pick -up head shall have a separate upper and lower chamber where pressurized air is blasted from upper <br /> chamber through an elongated blast orifice to street surface. <br /> f.( Blast orifice flange shall be of bolt -on design so that flange is easily replaced and shall have adjustment <br /> mechanism so that blast orifice gap is easily adjusted without removing pick -up head from sweeper. <br /> yf i Pick -up head shall have a 14 inch diameter (minimum) pressure inlet ring located on left side of pick -up head. <br /> %f A 14 inch diameter (minimum) pressure hose attached between pick -up head and blower housing shall be <br /> JJ provided. <br /> /72:1 A bolt -on pressure inlet ring with turning vanes shall be provided for efficient performance and easy service. <br /> IS A 14 inch diameter (minimum) suction hose, attached to a quick disconnect transition at the hopper, shall extend <br /> down to the right side of the pick -up head and shall be attached to the pick -up head suction nozzle ring which <br /> shall be constructed of 1/4 inch steel. <br /> 4a Suction hose shall have a minimum 3/8 inch wall construction for long life. <br /> itS Pick -up head shall be equipped with 2" wide adjustable side mounted integral alloy steel and carbide runners for <br /> maximum pick up ability and long life. Skid runners to be warranted for 2 years /2,000 hours prorated. Runners <br /> shall be symmetrical for optimum life. <br /> y ff Pick -up head shall be raised and lowered hydraulically by a single switch on the control panel. <br /> 915 Pressure inlet ring shall be equipped with an adjustable pressure relief for optimum leaf and light debris sweeping; <br /> control shall be mounted inside cab. <br /> GUTTER BROOM(S) <br /> Dual gutter brooms shall be 43 inch minimum diameter, wire filled vertical digger type for removing debris from <br /> gutter area. <br /> P r Gutter brooms shall be hydraulic motor driven and shall be positioned laterally and vertically by one hydraulic <br /> cylinder. <br /> 1 J Gutter broom down pressure shall be automatically adjusted to load by a pressure sensing sequence valve in line <br /> 0 with gutter broom torque motor. <br /> Each gutter broom shall have adjustment for bristle contact pattern and wear. <br /> 70 Each gutter broom shall have lateral flexibility to swing rearward 15" when encountering the impact of an <br /> immovable object thus avoiding damage to the broom assembly. <br /> y Ld Each gutter broom shall have a spring adjustment to allow downward compensation for bristle wear and shall be <br /> /, free floating to follow street contour. <br /> Each gutter broom shall be held in the up and transit position by use of an electric lock valve attachment. Upward <br /> motion of gutter broom shall be regulated by an adjustable flow control valve. <br /> Each gutter broom shall be controlled from inside the cab by a single electric toggle switch. <br /> Each gutter broom shall have minimum three (3) inch extensions. <br />