8. Roller and Wheel Assemblies (FW, CG, RS)
Not Scheduled. Removal or disassembly of the gate is usually required for inspection of roller and
wheel assemblies. Roller assemblies should be checked for any damaged rollers, pins, or links.
Rollers and wheels should be checked for free movement and for flat spots or other indications that
the rollers or wheels have been sliding and not rolling. Antifriction bearings (roller or ball bearings)
should be checked for free rotation, adequate lubrication, corrosion, and replaced as necessary.
Bronze bushings should be checked for scoring or adequate lubrication. Bearing seals should be
replaced if there is any sign of damage. The bearing journal should be checked for scoring, corrosion,
or any other damage. The bearing journal of self-lubricated bushings can sometimes corrode due to
a electrolytic reaction from the graphite in the bushing. If this is noted, the bushings should be
replaced with a nongraphite, self-lubricated bushing or a plain bronze bushing with some type of
9. Pivot Pins and Hinges (DG, RG)
Annual. Check general condition of pivot pin or hinge, looking for bent or damaged parts. Check
that pivot pins are properly lubricated. Inspect concrete adjacent to anchors or pivot pins for
cracking or spalling.
10.Gate Frames and Bonnet (RS, RF, JF, SG)
Annual. If accessible, inspect interior of fluidway, checking for any cavitation erosion, corrosion, or
other damage. Check bonnet cover for cracks or leaky gaskets. Check for excessive leakage past
gate stem and position indicator rod packing and tighten as required. If equipped with a lower bonnet
drain, flush silt from bottom of bonnet.
Not Scheduled. Disassemble gate and inspect for any cracks, corrosion, cavitation erosion, or any
other damage. Sandblast or clean by acceptable method and paint interior of bonnet as necessary.
11. Gate Leaf, Skin Plates, and Structural Members (FW, CG, RS, RF, BH, DG, JF, SG, CY, RG,
Annual. Accessible portions should be checked for corrosion, cavitation erosion, missing or damaged
bolts or rivets, or any other damage. Check flexible drain hoses of drum gates to ensure they are
clear and unplugged.
Not Scheduled. Disassemble gate or install bulkhead gates and unwater to allow inspection of entire
gate or gate leaf. Check bottom of the gate leaf or gate for cavitation erosion. Sandblast or clean
by acceptable method and paint as necessary. Check structural members for cracked welds, missing
or damaged bolts or rivets, or any other damage. On drum gates and some radial gates, check interior
of gate for leaks, plugged drain holes, and general condition. Drum gate flexible drain hoses should
be cleaned with a rotary drain cleaner.