Overview#
The Kohler 350REOZJB is a 360-kilowatt diesel standby generator powered by a John Deere 6135HFG84B — a 13.5 L turbocharged charge-air-cooled inline-6 running at 1800 RPM. This is the Tier 3 EPA-certified variant of Kohler's REOZJ platform, designed for stationary emergency standby duty.
At 360 kW, this unit sits at the upper boundary of the mid-range commercial class. Facilities that use it include community hospitals, mid-size data centers, university buildings, and government installations requiring NFPA 110 Level 1 compliance. The generator set accepts rated load in one step and is factory-built and production-tested by Kohler Co., providing one-source system integration.
The 350REOZJB supports multiple voltage configurations (120/208V, 277/480V, 120/240V single-phase) and is compatible with Kohler's APM402, APM603, and Decision-Maker 6000 paralleling controllers. Paralleling capability supports up to 8 units on an isolated bus with first-on logic, kW/kVAR load sharing, and protective relays — making it suitable for N+1 redundancy arrays at mission-critical sites.
Specifications#
| Spec | Value |
|---|---|
| Standby Power | 360 kW |
| Voltage (primary) | 277/480V three-phase |
| Frequency | 60 Hz |
| Engine | John Deere 6135HFG84B |
| 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% load) | 26.5 gph |
| Fuel consumption (75% load) | 21.2 gph |
| Overall dimensions | 142.9" x 56.1" x 78.5" |
| 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 |
The John Deere 6135 uses a water-cooled oil cooler and a single cartridge oil filter. Kohler specifies Kohler Genuine oil and filters. Oil pan capacity is 40.0 L (42.3 qt) dry, 42.0 L (44.4 qt) with filter.
Common Failure Modes#
Fuel quality and degradation is the leading service issue for standby generators in this class, typically manifesting around 4,380 hours (roughly one year of runtime equivalent). Diesel that sits in day tanks without treatment develops microbial contamination and fuel stratification, leading to injector fouling, hard starting, and filter clogging. Quarterly fuel polishing and biocide treatment are standard practice for NFPA 110 Level 1 accounts.
Turbocharger wear typically appears around 12,000 hours under normal operating conditions. Symptoms include progressive power loss, excessive smoke under load, and increased oil consumption. The turbocharger on the 6135 platform is serviceable in the field; replacement turbos are stocked through John Deere's commercial parts network.
Starting battery degradation presents as slow crank or failed exercise at roughly 8,760 hours. The 350REOZJB uses two 925 CCA (12V each) batteries in a 24V configuration. Battery condition testing should be part of every annual NFPA 110 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 360 kW REOZJB installations, we typically structure maintenance programs around annual NFPA 110 Level 1 inspections combined with semi-annual fuel conditioning checks. The John Deere 6135 platform benefits from excellent parts availability and a well-documented service manual, which keeps repair windows short when unplanned issues arise.
FAQ#
Q: What engine powers the Kohler 350REOZJB? A: The 350REOZJB uses a John Deere 6135HFG84B — a 13.5 L, 6-cylinder turbocharged charge-air-cooled diesel at 1800 RPM. This is the Tier 3 stationary emergency variant of the 6135 platform.
Q: What is the standby power rating of the 350REOZJB? A: The 350REOZJB is rated at 360 kW standby at 0.8 power factor per Kohler published specifications (spec sheet G5-402).
Q: Does OnPoint service the Kohler 350REOZJB? A: Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California, including the 360 kW class.
Q: What controller options are available for the 350REOZJB? A: Kohler offers the APM402 (digital display, Modbus), APM603 (7-inch touchscreen, paralleling up to 8 units), and Decision-Maker 6000 (advanced paralleling with remote monitoring). For NFPA 110 Level 1 compliance, any of these controllers can be configured appropriately when paired with the required accessories.
