14. Generator Air Brake Valve
Annual. Check manual and solenoid operation of valve. Lubricate pivot points with light machine oil. Clean
Biannual. Disassemble and remove all rust spots with a fine grade emery cloth (320 to 500) and crocus
cloth. Lap valve seats if required.
15. Permanent Magnet Generator or Speed Signal Generator
Annual. Inspect speed switches and drive gears for wear. Lubricate pivot pins and check speed switch
bearings. Check setting and operation of speed switches. Check insulation between PMG or SSG housing
and the supporting frame by measuring the resistance from the housing to ground with a meggar. Replace
or repair insulating gasket as required. Check voltage output of PMG.
Not Scheduled. Replace main drive bearings of PMG or SSG. If necessary, remagnetize PMG field
following procedure in
FIST, volume 2-3.
16. Position and Limit Switches
Annual. Check operation and settings of gate limit, speed changer position, and gate position switches.
Adjust as required. Clean contacts as required. Check drive gears for wear and proper meshing. Check
annunciation where applicable.
17. Shutdown Solenoids
Annual. Check operation of solenoids for binding or sticking when tripped and reset. Check settings to
ensure complete shutdown solenoid closes wicket gates completely and partial shutdown solenoid brings
gates to speed no load setting. Inspect solenoid for any signs of any overheating or other damage. Check
condition of electrical connections and auxiliary contacts.
18. Speed Changer and Gate Limit Motors and Remote Position Indicators
Annual. Operate motors and check for excessive vibration or noise. Replace bearings as required. Check
electrical connections and motor brushes. Check operation of position indicators for any sticking or
binding and check correlation between transmitter and receiver. Check gears for wear and proper meshing.
19. Governor Inspection Report
the annual inspection.