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Speed Gradually Increases Or Decreases After Speed Is Set

  1. Ensure engine performs normally. Perform SPEED DECREASES ON STEEP GRADES OR UNDER HEAVY LOADS test. Ensure accelerator pedal and linkage open throttle fully. Go to next step.
  2. Check vacuum dump valve. See VACUUM DUMP VALVE TEST. Service vacuum dump valve if necessary. If vacuum dump valve is okay, go to next step.
  3. Check servo. See SERVO TEST. Tap servo body lightly while testing. Replace servo if defective. If servo is okay, perform AMPLIFIER TEST.
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