Cummins/Onan — Initial Start and Check
Operation · Generator set
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKUB, Cummins/Onan MDKWB, Kubota Z482B engine, Kubota D722B engine
Before you start
- Exhaust gas is deadly. Shut down the generator set immediately if an exhaust leak or exhaust component needs repair.
- Do not operate the generator set after a high exhaust temperature shutdown until the entire exhaust system has been checked and serviced as required.
Procedure
- Make sure the fuel shutoff valve and raw water cock are open.
- Start the genset by holding the Start/Stop switch in Start position.
- The genset should start within a few seconds.
- Check water flow at the hull exhaust outlet, and operation of the genset.
- Check the exhaust system for leaks—visually and audibly.
- Check the genset for fuel, oil and coolant leaks.
- Connect an accurate AC voltmeter and frequency meter across two line terminals.
- Apply load to the generator and check the output.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan MDKUB →, Cummins/Onan MDKWB →, Kubota Z482B engine →
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.