drum, and gear shaft bearings equipped with grease fittings. Check gears for uneven wear, galling, or signs
of misalignment. Check condition of brake shoes and brake drums for signs of overheating or other damage.
Not Scheduled. Drain gear boxes and refill with new oil. Grease coated gears should be cleaned and recoated
with new grease.
16.Hydraulic Hoists (FW, CG, RS, RF, JF, SG, CY, BV, HJ)
Annual. Check entire hydraulic system for leaks, including piping, valves, and packing. Drain accumulations
of water and sediment from oil reservoir and lower end of hydraulic cylinders. Prior to scheduled maintenance,
take oil sample after operating system for sufficient time to allow the oil and any contaminants to mix. Oil
sample should be checked for water content, viscosity, acidity, and solid contaminants. Based on results of
oil tests, drain system, filter oil, and clean oil reservoir with lint free rags. Add oil to system if necessary to
bring oil to proper level, making sure oil added is exactly the same type and viscosity as the oil in the system.
Clean or replace oil filters. Calibrate pressure gauges and pressure switches. Check setting and operation of
pressure relief valves. Operate gate or valve through a complete openclose cycle under balanced conditions,
checking the opening or closing times and noting any unusual or excessive noise or vibration. If there is a
significant increase in either the opening or closing time, determine the reason for increase. Check surface
condition of piston stem for rusting, scoring, or other conditions that could impair operation or cause leakage.
Check position indicators to ensure wire rope and sheaves or chains and sprockets move freely.
Not Scheduled. Remove cylinder head and inspect cylinder wall looking for signs of corrosion pitting or
scoring. Check condition of stems and stem couplings, applying a coating of water proof grease to couplings
normally submerged or exposed to moisture
Guard Gate and Valve Closure Tests
17. Balanced Closure Tests (FW, CG, RS, RF, SG, CY, RG, BV)
Annual. Perform gate or valve closure test under balanced, no flow conditions following test procedure for
particular gate or valve being tested. Test procedure should be for the specific gate or valve being tested and
not a similar one. Contact the Hydroelectric Research and Technical Services Group, D-8450, if a procedure
is not available or if there is any uncertainty about the procedure that is available.
18. Unbalanced, Emergency Closure Tests (FW, CG, RS, RF, SG, RG)
Ten Year. Perform gate or valve closure test under full flow conditions following test procedure for the gate
or valve being tested. Test procedure should be for the specific gate or valve being tested and not a similar one.
Contact the Hydroelectric Research and Technical Services Group, D-8450, if a procedure is not available or
if there is any uncertainty about the procedure that is available.
Auxiliary Piping Systems
19. Pipe and Fittings - Exterior Surface
Annual. Visually inspect all threaded, welded, and flanged fittings checking for any leaks or corrosion.
Replace or tighten fittings or pipe as required. Check pipe hangers and supports to make sure they are carrying