Overview#
The Kohler 350REOZJC is a 350-kilowatt standby (320 kW prime) diesel generator powered by a John Deere 6135HF485T — a 13.5 L turbocharged charge-air-cooled inline-6 at 1800 RPM. As the successor to the REOZJB in this power class, the JC variant adds prime power ratings and approval for Hydrotreated Vegetable Oil (HVO) / Renewable Diesel (RD) fuels compliant with EN15940 / ASTM D975.
The 350REOZJC is Tier 3 EPA-certified for stationary emergency applications and is UL 2200 listed. Typical deployments include commercial office buildings, healthcare facilities, institutional campuses, and government installations where NFPA 110 Level 1 standby power is required. At 350/320 kW standby/prime, this unit provides reliable power for facilities too large for residential-class equipment but not yet requiring the Volvo-powered REOZVB series above 500 kW.
Support for HVO/RD fuels (with up to 4% higher volumetric consumption than #2 ULSD) makes the 350REOZJC suitable for facilities with sustainability mandates that require lower-carbon standby options without replacing the generator set.
Specifications#
| Spec | Value |
|---|---|
| Standby Power | 350 kW |
| Prime Power | 320 kW |
| Voltage (primary) | 277/480V three-phase |
| Frequency | 60 Hz |
| Engine | John Deere 6135HF485T |
| Engine type | 4-cycle turbocharged, charge air-cooled |
| Cylinders | 6 inline |
| Displacement | 13.5 L (824 cu. in.) |
| Compression ratio | 16.0:1 |
| Rated RPM | 1800 |
| Alternator | Kohler 4M4019 |
| Fuel | Diesel (#2 / HVO / RD) |
| Cooling | Liquid (radiator) |
| Emissions tier | EPA Tier 3 stationary emergency |
| Fuel consumption (100% standby load) | 26.5 gph |
| Fuel consumption (75% standby load) | 19.3 gph |
| Overall dimensions | 142.9" x 56.1" x 76.2" |
| Operating weight | 8,560 lb |
Service & Maintenance#
| Service | Interval |
|---|---|
| Oil change | Every 250 hours or 12 months |
| Fuel filter replacement | Every 500 hours |
| Air filter replacement | Every 500 hours |
| Coolant flush | Every 3,000 hours or 5 years |
| Load bank test | Annually (NFPA 110 requirement) |
| Major overhaul | Every 15,000 hours |
Oil pan capacity is 40.0 L (42.3 qt) dry and 42.0 L (44.4 qt) with filter change. The 6135HF485T uses a single cartridge oil filter with a water-cooled oil cooler. Kohler specifies its Genuine oil and filter line for this engine.
Common Failure Modes#
Fuel quality and degradation is the leading cause of unplanned outages on standby generators at this power level. Diesel stored in day tanks without biocide treatment develops microbial growth and sediment, causing injector fouling, hard starting, and filter blockage — typically appearing around 4,380 hours of service life. Quarterly fuel polishing is standard protocol for NFPA 110 Level 1 accounts.
Turbocharger wear manifests around 12,000 hours. The 6135HF485T is turbocharged and charge air-cooled; turbocharger degradation presents as progressive power loss and increased exhaust smoke under load. John Deere's parts network supports rapid field replacement.
Starting battery failure is the most common cause of failed monthly exercise tests, typically around 8,760 hours. The 350REOZJC requires two 925 CCA 12V batteries in a 24V series configuration. Battery condition testing should be integrated into every NFPA 110 annual inspection.
Our service experience#
OnPoint Generators provides installation, maintenance, load bank testing, and emergency service for Kohler industrial generators throughout Northern California and the Central Valley. For 350REOZJC installations, we maintain fuel treatment programs on a quarterly basis alongside the standard annual NFPA 110 inspection. The John Deere 6135 platform's wide parts availability and documented service procedures allow us to minimize downtime when unplanned repairs are required.
FAQ#
Q: What engine powers the Kohler 350REOZJC? A: The 350REOZJC uses a John Deere 6135HF485T — a 13.5 L, 6-cylinder turbocharged charge-air-cooled diesel at 1800 RPM, rated for Tier 3 stationary emergency standby.
Q: What is the standby power rating of the 350REOZJC? A: 350 kW standby and 320 kW prime at 0.8 power factor per Kohler spec sheet G5-618.
Q: Does the 350REOZJC support renewable diesel fuels? A: Yes. The 350REOZJC is approved for HVO/Renewable Diesel compliant with EN15940/ASTM D975. Expect volumetric fuel consumption approximately 4% higher than with standard #2 ULSD.
Q: Does OnPoint service the Kohler 350REOZJC? A: Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZJ diesel generators throughout Northern California, including the 350 kW class.
