Cummins/Onan — Throttle Lever Position and Linkage Adjustment
Adjustments · Injection pump / governor actuator linkage
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDGDA, Cummins/Onan MDGDB
Before you start
- Do not adjust the idle speed screw or break its wire seal. Doing so can void the generator set warranty.
Procedure
- Operate the set and disconnect all loads after engine warms to normal operating temperature.
- Loosen locknut on throttle lever speed adjusting screw; turn screw counterclockwise to 1980 RPM (66 Hz) for 60 Hz sets or 1650 RPM (55 Hz) for 50 Hz sets.
- Set the locknut; leave the spring in place to maintain throttle lever position.
- Move fuel pump stop lever (inboard lever) forward slowly until the engine stops; hold this stop position when linkage is connected.
- Thread locknut onto male swivel-end link; thread female link five turns onto male link and set the locknut.
- Secure male end of link to the injection pump lever on the engine side of the pump; tighten two nuts first.
- Loosely thread the locknut and clevis onto the actuator shaft.
- Rotate the injection pump lever to the established stop position; turn the clevis until the link swivel hole registers with the clevis holes; connect with screw, nut and lock washer.
- Tighten the clevis locknut on the actuator shaft.
Specs & values
- 1980 RPM (66 Hertz) for 60 Hertz sets
- 1650 RPM (55 Hertz) for 50 Hertz sets
Full service-parts list: Cummins/Onan MDGDA →, Cummins/Onan MDGDB →
Source: Cummins/Onan 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.