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Home›Repair guides›Generac›Voltage Regulator Adjustment

Generac 4700 / QuietPact 40 — Voltage Regulator Adjustment

Adjustments

For the Generac 4700 / QuietPact 40, from the Generac service manual.

Applies to: Generac 4700, Generac QuietPact 40, Generac GH-220 engine

Before you start

  • Adjustment of the voltage adjust potentiometer must be done only when the unit is running at its correct governed no-load speed.

Procedure

  1. Run unit at correct governed no-load speed; no-load AC output frequency should be about 62.5 Hertz.
  2. With no load on the generator, slowly turn the voltage adjust pot on the voltage regulator until 124 VAC is measured.
  3. If voltage is not adjustable, proceed to Troubleshooting Problem 2.

Specs & values

  • About 62.5 Hertz no-load
  • 124 VAC at stated frequency

Full service-parts list: Generac 4700 →, Generac QuietPact 40 →

Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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