Cummins/Onan — Returning the Genset to Service
Operation · Generator set
From a Cummins/Onan operator's 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
- Battery electrolyte can cause severe eye damage and burns.
Procedure
- Remove plug from exhaust outlet and open sea cock.
- Check tag on oil base and verify oil viscosity is correct for existing ambient temperature.
- Clean and check battery. Measure electrolyte specific gravity (1.260 @ 80°F [27°C]) and verify proper level. Charge if low.
- Prime fuel system.
- Connect starting battery, negative cable last.
- Remove all loads before starting genset.
- After starting, run generator set at no load for roughly 30 seconds. Then apply load of at least 50 percent rated capacity.
- Check all gauges for normal readings.
Tools required
- hydrometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Specific gravity 1.260 @ 80°F (27°C)
- Apply at least 50 percent rated capacity
Full service-parts list: Cummins/Onan MDKUB →, Cummins/Onan MDKWB →, Kubota Z482B engine →
Source: Cummins/Onan operator's 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.