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6.1.E. - Page 6 <br /> CITY OF REDWOOD CITY <br /> Truck Mounted Continuous Rodder <br /> Technical Specifications <br /> 12-08-11 <br /> Drive Head Design: Rod drive head to contain three pairs of drive rollers directly driven <br /> through pinion gears by two hydraulic motors. Three drive rolls to be mounted on stationary <br /> shafts attached to side plates. Three opposing drive rolls to be mounted on adjustable shafts <br /> to compensate for wear. Clamping force on drive rolls to be applied hydraulically with <br /> pressure proportional to pulling or pushing force to eliminate excess wear in light rodding <br /> conditions and to allow maximum torque during heavy load conditions. Hydraulic tension to <br /> be applied directly to drive roll shaft. <br /> a. Drive Rollers: Drive roll gears to have rolled instead of cut teeth, and to be pressed <br /> directly onto machined drive roll with a minimum of two setscrews or drive pins to <br /> eliminate movement and slipping. Drive rolls to ride on a minimum of two radial <br /> and two thrust bearings. Bearings to accept a minimum of 1-1 /4" diameter <br /> stressproof drive rolls shafts. <br /> b. Hydraulic Drive: Hydraulic fluid to be plumbed directly from lateral valve through <br /> hydraulic swivel barrel to drive head. All plumbing to motors to be steel tubing with <br /> J.I.C. flare type fittings. No black pipe or flexible hoses to drive motors. Lateral <br /> drive to feed motors in a parallel fashion for low speed - high torque drive, and in a <br /> series fashion for high speed — low torque drive. Gearing to be internal for structural <br /> integrity, to shorten span between torque load points, and to eliminate additional <br /> wear points associated with chains, keyways, bearings and shafts. <br /> c. Drive Head Housing Construction: Drive head housing to be of welded construction, <br /> composed of 1/2" # 1018 C.R. side plates, 3/4" # 1018 C.R. end plates and <br /> incorporating welded rod guide bushings and drive head spool shaft. Side plates to <br /> be precision machined in pairs to insure perfect alignment. Assembly to be j ig <br /> welded. Drive head spool shaft to be machined after assembly to insure trueness. <br /> Final Assembly - Finish: <br /> Paint: Entire rodder assembly to be primed and shrouded with 16 gauge steel sheet metal <br /> and painted with a minimum of two coats of primer and two coats of acrylic enamel paint <br /> with hardener prior to mounting on truck bed. Shroud to be removable in sections for access <br /> to components for repairs. Screened access openings to be included in reel cage shroud in <br /> place. <br /> Truck Bed - Construction: Rodder truck bed to be constructed from 12 gauge smooth steel <br /> sides with 12 gauge thread plate load areas. Structural framing and rear bumpers to be <br /> integral and constructed from 4" x 5.4# H.R. channel. Truck bed to incorporate wheel chock <br /> holders, quadrant storage, and full LC.C. lighting. Stop, turn, and back-up lights to be flush <br /> mounted in rear panel with replaceable lenses. <br /> 3 <br />