Overview#
The Kohler 550REOZVB is a 550-kilowatt standby (500 kW prime) diesel generator powered by a Volvo TAD1642GE-B — a 16.12 L turbocharged charge-air-cooled inline-6 at 1800 RPM. Kohler's REOZVB series steps up from the REOZJ platform by adopting Volvo's heavy-duty industrial engine line, which extends service intervals, raises the prime power ceiling, and increases displacement for improved thermal headroom under sustained load.
At 550/500 kW standby/prime, this unit targets large commercial and industrial standby applications including regional hospitals, Tier II/III data centers, large manufacturing plants, and campus distribution systems. The REOZVB series carries EPA Tier 2 certification for stationary emergency applications and meets NFPA 110 Level 1 when equipped with the appropriate accessories.
The 550REOZVB is approved for Hydrotreated Vegetable Oil (HVO) / Renewable Diesel compliant with EN15940/ASTM D975, making it an option for organizations with sustainability mandates that require lower-carbon standby power.
Specifications#
| Spec | Value |
|---|---|
| Standby Power | 550 kW |
| Prime Power | 500 kW |
| Voltage (primary) | 277/480V three-phase |
| Frequency | 60 Hz |
| Engine | Volvo TAD1642GE-B |
| Engine type | 4-cycle turbocharged, charge air-cooled |
| Cylinders | 6 inline |
| Displacement | 16.12 L (984 cu. in.) |
| Compression ratio | 17:1 |
| Rated RPM | 1800 |
| Alternator | Kohler 5M4028 |
| Fuel | Diesel (#2 / HVO / RD) |
| Cooling | Liquid (radiator) |
| Emissions tier | EPA Tier 2 stationary emergency |
| Fuel consumption (100% standby load) | 39.9 gph |
| Fuel consumption (75% standby load) | 28.8 gph |
| Overall dimensions | 166.5" x 72" x 77.2" |
Service & Maintenance#
| Service | Interval |
|---|---|
| Oil change | Every 500 hours or 12 months |
| Fuel filter replacement | Every 500 hours |
| Air filter replacement | Every 1,000 hours |
| Coolant flush | Every 6,000 hours or 5 years |
| Load bank test | Annually (NFPA 110 requirement) |
| Major overhaul | Every 20,000 hours |
The Volvo TAD1642GE-B has an oil pan capacity of 42.0 L (44.4 qt) dry and 48.1 L (50.8 qt) with filter. It uses three cartridge oil filters and a water-cooled oil cooling system. The extended 500-hour oil change interval (vs. 250 hours on the John Deere REOZJ series) reduces maintenance frequency for high-runtime installations.
Common Failure Modes#
Fuel quality and degradation is the primary service concern for standby generators in this class. Diesel stored without treatment for extended periods develops microbial contamination and sediment that clogs filters and fouls injectors, typically first appearing around 4,380 hours. Quarterly fuel polishing and biocide treatment are standard for NFPA 110 Level 1 facilities.
Turbocharger wear typically manifests around 12,000 hours. The Volvo TAD1642GE-B is highly turbocharged (compression ratio 17:1), making turbocharger condition a critical service point. Symptoms include power loss, elevated exhaust temperature, and oil carryover into the intake. Volvo's commercial service network provides strong parts support in Northern California.
Charge air cooler fouling can appear around 10,000 hours and reduces output by elevating intake charge temperatures. The charge air cooler on the Volvo platform is accessible for cleaning and inspection as part of extended service intervals.
Starting battery degradation presents as slow crank or failed exercise at approximately 8,760 hours. The 550REOZVB uses two 925 CCA (12V) batteries in 24V configuration with an 80A charging alternator.
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 550REOZVB installations at hospitals and data centers, we structure maintenance around annual NFPA 110 compliance inspections, semi-annual fuel system checks, and scheduled charge air cooler inspections at the extended service intervals. The Volvo TAD1642 platform is well-supported through Volvo's regional distribution network.
FAQ#
Q: What engine powers the Kohler 550REOZVB? A: The 550REOZVB uses a Volvo TAD1642GE-B — a 16.12 L, 6-cylinder turbocharged charge-air-cooled diesel at 1800 RPM, EPA Tier 2 certified for stationary emergency standby.
Q: What is the standby power rating of the 550REOZVB? A: 550 kW standby and 500 kW prime at 0.8 power factor per Kohler spec sheet G5-395.
Q: How does the 550REOZVB compare to the 500REOZJC? A: The 550REOZVB has a larger Volvo engine (16.12 L vs 13.5 L John Deere), higher prime power rating (500 kW vs 455 kW), longer oil change intervals (500 hours vs 250 hours), and longer coolant change intervals (6,000 hours vs 3,000 hours). It targets heavier-duty and higher-runtime installations.
Q: Does OnPoint service the Kohler 550REOZVB? A: Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZVB diesel generators throughout Northern California, including the 550 kW class.
