General

UNDERSPEED

UnclassifiedSpeed

What This Code Means

Engine stops; UNDERSPEED Fault Lamp Illuminates

Possible Causes

  • •Engine overloaded
  • •Inadequate supply of fuel to the engine
  • •Governor speed setting lever has moved
  • •Electronic governor linkage movement restricted
  • •Incorrect alternator voltage
  • •Incorrect engine governor control speed setting

Suggested Actions

  1. 1Ensure engine has not been overloaded.
  2. 2Ensure there is an adequate supply of fuel to the engine.
  3. 3Check if governor speed setting lever has moved and re-adjust if required.
  4. 4If electronic governor is fitted, check linkage for free movement and adjust if required.
  5. 5Clear the fault by turning the Control Switch to STOP and restart the engine.
  6. 6Ensure alternator is running at the correct voltage by checking on the panel meters.
  7. 7With engine running, set correct speed on the engine governor control.
  8. 8Refer to the Engine Manual.

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