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Printed on:Monday 03/24/2025 11:55 PM 29C0131/AABH/149249Pageof9 <br />Department of Transportation - Division of Maintenance Structure Maintenance & Investigations <br />13 <br />603 <br />604 <br />605 <br />606 <br />607 <br />Balance System - Mechanical <br />Drive System - Mechanical <br />Operation <br />Alignment (Mechanical) <br />Drive System - Electrical <br />Wear(Electrical) <br />Control System - Mechanical <br />Control System - Electrical <br />Accessibility and Labeling <br />2 <br />2 <br />2 <br />2 <br />2 <br />2 <br />2 <br />2 <br />2 <br />1 <br />3 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />ea. <br />ea. <br />ea. <br />ea. <br />ea. <br />ea. <br />ea. <br />ea. <br />ea. <br /> 1 <br /> 1 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 1 <br /> 0 <br /> 0 <br /> 0 <br /> 2 <br /> 1 <br /> 1 <br /> 0 <br /> 0 <br /> 0 <br /> 1 <br /> 1 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 1 <br /> 1 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br />MECHANICAL/ELECTRICAL ELEMENT INSPECTION RATINGS AND NOTES <br />9000 <br />9003 <br />9002 <br />9005 <br />MECHANICAL/ELECTRICAL <br />(602) Balance System - Structural <br />(603) Balance System - Mechanical <br />(604) Drive System - Mechanical <br />(604-9000) Operation <br />(604-9003) Alignment (Mechanical) <br />(605) Drive System - Electrical <br />(605-9002) Wear(Electrical) <br />(606) Control System - Mechanical <br />(607) Control System - Electrical <br />Element DescriptionElem <br />No. <br />Env Total <br />Qty <br />Units <br />CS 1 CS 2 CS 3 CS 4 <br />Qty in each Condition StateDefect/ <br />Prot Defect <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />The balance system consists of center pivot pier the balance wheels and track assemblies. <br />Balance system consists of six balance wheels and track on the pivot pier. <br />The bridge drive systems consist of three separate systems, the span drive, the center wedge drive, and the end wedge drive. <br />The span drive system consists of single GE 7.5 HP, 1750 RPM input, electric gear motor with built in motor brake coupled to a right- <br />angle gear reducer with a pinion gear on the output shaft. The pinon drives a series of pinion and bull gears which drive the single <br />main drive pinion which rotates the bridge around the fixed ring gear. <br />The center wedge drive consists of a single 1 HP 1730 RPM input, electric gear motor with built in motor brake. The gear motor has <br />a 32.28:1 gear reduction. The gear motor drives a chain connected to a chain sprocket affixed to a drive shaft. The drive shaft turns <br />a series of pinion and bull gears which turn a common shaft connected to cam linkage that drive and pull both the center wedges. <br />The end wedge drive system at each end of the fixed spans, consist of a single 3 HP 1750 RPM input electric gear motor with built in <br />motor brake. The gear motor has a 32.28:1 gear reduction. The gear motor drives a shaft with two chain sprockets that drive 2 loops <br />of chain, that drive chain sprockets affixed to worm drive shafts. The drive shafts pull and push linkage that operate the wedges. <br />The centering pin is raised and lowered by linkage connected to the end wedge drive system. <br />Mech/Elect (06/02/2021) The drive chains for both end jack systems are loose and no adjustment is available. When operating the <br />end jacks, the chains are slapping against structural steel. Consider changing the idler mounting support frames that are riveted to <br />the deck girders. Adding slots to the frames and bolting back to the girders will provide a means to adjust the slack in the chains. <br />(5/9/2023) Condition still present. <br />Mech/Elect (06/02/2021) Right angle drive gearbox pinion and gear are misaligned and exhibiting more contact wear at the bottom <br />than top. Mating pinion and gear should be adjusted to allow even meshing across the full gear width. <br />(5/9/2023) Condition still present. <br />The electrical drive system consists of a main drive motor and wedge motor located at the center pivot pier. An end jack motor is <br />located at each end of the span. <br />Mech/Elect (06/02/2021) All drive motors (Main, Wedge, & End Jack) exibit minor corrosion. The wedge drive motor operates <br />normally. The motor insulation resistance value measures less than 50% below the minimum recommended by NETA <br />(5/9/2023) Condition still present. <br />Chains.