Cummins/Onan — Governor adjustment, Power Units PE-95-(2) and PE-95-F
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Do not turn bumper screw far enough to increase engine speed
Procedure
- Have unit at normal operating temperature; keep governor drive belt at proper tension (about 1 inch deflection midway between pulleys).
- Adjust throttle rod so throttle lever is 1/64 inch from wide-open stop.
- Loosen bumper-spring-screw locknut and turn bumper-spring screw out to prevent its functioning.
- Loosen spring-slide shoulder screws; loosen spring-slide adjusting screw locknut and turn screw for correct speed.
- At no load, frequency should not exceed 63 cycles and voltage not over 126 or 252 volts.
- If surging under load, adjust governor spring eyebolt downward until surging stops.
- If surging at no load, turn bumper screw in until surging stops; tighten all locknuts.
Specs & values
- No-load frequency must not exceed 63 cycles
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.