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Home›Repair guides›Booster Spring Adjustment

Detroit Diesel — Booster Spring Adjustment

A Detroit Diesel service procedure — check it applies to your exact model before use.

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Procedure

  1. Move the speed control lever to the idle speed position.
  2. Refer to Fig. 9 and loosen the nut on the booster spring retaining bolt on the governor speed control lever. Loosen the lock nuts on the eye bolt at the opposite end of the booster spring.
  3. Move the bolt in the slot of the speed control lever until the center of the bolt is on or slightly over center (toward the idle speed position) of an imaginary line through the bolt, lever shaft and eye bolt. Hold the bolt from turning and tighten the lock nut.
  4. Start the engine and move the speed control lever to the maximum speed position and release it. The speed control lever should return to the idle position. If it does not, reduce the spring tension. If the lever does not return to the idle position, increase the tension of the spring until the lever will not return to idle. Then reduce the tension until the lever will return to idle and tighten the lock nut on the eye bolt. This setting will result in a minimum force required to operate the speed control lever.

Source: manual:part 2.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.