Cummins/Onan GS-107-AC — Starting the engine (manual crank)
Operation
For the Cummins/Onan GS-107-AC, from the Cummins/Onan service manual.
Applies to: Hol-Gar GS-107-AC, Cummins/Onan J120-S/967F engine
Procedure
- Prime carburetor with fuel pump priming lever about 15 strokes; return lever inward.
- Set engine switch in START position.
- Set hand choke as required by local temperature.
- Engage hand crank with handle at 7 o'clock position.
- Pull crank to 12 o'clock with sharp steady pull; remove when engine starts.
- Place engine switch in RUN position.
- Check oil pressure; it should be at least 20 psi.
- Readjust choke as engine warms.
Tools required
- Hand crank Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oil pressure at least 20 psi
Full service-parts list: Hol-Gar GS-107-AC →
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.