Hercules — Governor Adjustment for Constant Speed
Adjustments · Mechanical governor
From a Hercules service manual — check it applies to your exact model before use.
Before you start
- Do not set maximum engine speed above that specified by the equipment manufacturer.
Procedure
- Adjust length of rod assembly for 1/8 to 1/4 inch clearance at throttle stop pin.
- Start engine and attach speed indicating tachometer.
- Turn screw in (clockwise) to increase speed, out to decrease.
- Lock speed screw with lock nut.
- Adjust sensitivity with spring eye clip and bolt.
- Adjust bumper screw to dampen high-speed surging; recheck idle position.
Tools required
- speed indicating tachometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Hercules 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.