The governor overhaul is overdue for a long time. Which consequences could be expexted?

asked 05 Jun, 06:47

June 5, 2019, 6:47 a.m.
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edited 05 Jun, 08:45


Answer:

Normal overhaul interval for governors is 5 years. If Maker recommended overhaul interval is exceeded significantly, internal parts of the governor got worn which reduces its capabilities to maintain the set speed and handle sudden load changes.
Following faults may be expected

  1. Different minimum speed and maximum speed when using the same degree of terminal shaft movement compared to the new/overhauled governor.
  2. When running at full speed with no load, the governor may have excessive movement in the output shaft (decreasing as the load gets increased).
  3. Extensive shafts play in both vertical and horizontal directions due to internal wear
  4. Wear steps in each shaft and in the associated bush
  5. Wear in pivot bushes and pins
  6. Wear on the droop pivot and on the floating lever
  7. Wear on the flyweight contact toes, altering the centralization of the pilot valve and therefore the responsiveness
  8. Wear of Idler gear and idler peg
  9. Wear of the main bushing on the drive splines
  10. Step wear on the internal control port
  11. Fretting of the speed adjusting internal lever
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answered 05 Jun, 08:43

June 5, 2019, 8:43 a.m.
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