Inspect the governor valves and bores for scores. Minor scores may be
removed from the valves with crocus cloth. Replace the governor if the valves
or body is deeply scored.
Inspect the AOD governor screen for obstructions. The screen must be free
of foreign material. If contaminated, clean thoroughly in a suitable solvent
and blow dry with compressed air.
Check for free movement of the valves in the bores. The valves should slide
freely of their own weight in the bores when dry. Inspect fluid passages in the
valve body and counterweight for obstructions and contaminants. All fluid passages must be clean.
Check the mating surface of the governor valve and the counterweight for
burrs or scratches.