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Department of Transportation - Division of Maintenance Structure Maintenance & Investigations MECHANICAL/ELECTRICAL ELEMENT INSPECTION RATINGS AND NOTES Elem Defect/ Element Description No. Prot Defect Env Total Units Qty CS 1 600 Support System - Structural 2 1 ea Qty in each Condition State CS 2 CS 3 CS 4 (600) Support System - Structural Non -Routine Inspection Element Notes: The structural support system consists of the end jacks, bearing and live load shoes, centering locks at each end of the bridge, and center wedges at the pivot pier. 601 Support System - Mechanical 2 1 ea (601) Support System - Mechanical Non -Routine Inspection Element Notes: The mechanical support system consists of a center bearing, center wedges, end jacks, bridge seats, and end locks. The center bearing assembly consists of a 4� square concrete base, lower pivot casing, lower bearing disc, upper bearing disc, and upper bearing casing. Centering wedges for supporting live loads are located on each side of the pivot pier. Each center wedge assemblies consists of an external Atlantic Hydraulic Systems pump, reservoir, and fliter, supplying pressure to a pivot based piston that operates to pull and push the wedge. There are three hydraulically driven end jacks at each end of the swing span that raise the bridge so the sliding bearings seats can retract. There are three hydraulically driven bearing seats or support bars with live load shoes at each end of the swing span to support the bridge for traffic. These bearing are retracted prior to swinging the bridge. Centering locks are located at the middle of each rest pier. The center locks are hydraulically driven and engage a receiver on each end of the swing span. Hydraulic drive systems for the center wedges and end jacks and seats were replaced in 2024-2025 under federal aid project No. BRLS-5929(229). 602 Balance System - Structural ea (602) Balance System - Structural Non -Routine Inspection Element Notes: The balance system consists of center pivot pier the balance wheels and track assemblies. 603 Balance System - Mechanical ea (603) Balance System - Mechanical Non -Routine Inspection Element Notes: The mechanical balance system consists of eight, 15�, balance wheels and track on the pivot pier. 604 Drive System - Mechanical ea (604) Drive System - Mechanical Non -Routine Inspection Element Notes: The mechanical drive systems consist of three types: The main bridge swing drive system, located on the center pivot pier, the end jack hydraulic drive system that operates the bridge jacks, seats, and center locks located on the west and east fixed spans, and the hydraulic center wedge drives. The main drive motor is a 25 HP 1175 RPM 326TDZ frame, with Eaton Variable Speed Drive. The gear reducer is Brad Foote Gear Works size 3PH1200-DF, 1100 RPM input, 38.6:1 gear reduction. The machinery brake is drum type affixed to the highspeed output side of the parallel gear reducer. The brake is thruster actuated by a Mondel 10MSY/E-ED23/5S actuator. The right-angle gear reducers are Brad Foote Gear Works size 2 RV1200-D, 28.5 input RPM, 7.79:1 ratio. The gearboxes transfer power from the main gear reducer through input shafts and out at 90-degree angles to the main drive pinions on opposite sides of the ring gear. There are two drive shafts that transfer power from the main gear reducer to the right-angle reducers (new bearings and couplers 2024). There are two output shafts from the right-angle reducers to the main drive pinions. There are two drive pinions that rotate the bridge around a center ring gear. The center wedges are each driven by a self-contained Sheffer Powr-Pak Model 35S01-82 1.5 HP hydraulic motor and drive piston. The end jack hydraulic system is the same on each side of the swing span. The system consists of the hydraulic pump and reservoir tank, control and pressure relief valves, and the hydraulic piping. 605 Drive System - Electrical 2 1 ea (605) Drive System - Electrical Non -Routine Inspection Element Notes: The electrical drive system consists of a main drive motor located with an eddy current clutch, center wedge motors, and hydraulic motors to operate the bridge jacks. There are also machinery brakes that help stop the movement of the span. Printed on: Monday 06/23/2025 03:39 PM Page 6 of 9 29C0108/AABG/154008