What engine powers the Kohler 300REOZJ?

The 300REOZJ uses a John Deere diesel engine running at 1800 RPM (model 6090HFG86).

What is the standby power rating of the 300REOZJ?

The 300REOZJ is rated at 300 kW standby per Kohler published specifications.

Does OnPoint service the Kohler 300REOZJ?

Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California, including the 300 kW class.

What engine powers the Kohler 300REOZJ?

The 300REOZJ uses a John Deere diesel engine running at 1800 RPM (model 6090HFG86).

What is the standby power rating of the 300REOZJ?

The 300REOZJ is rated at 300 kW standby per Kohler published specifications.

Does OnPoint service the Kohler 300REOZJ?

Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California, including the 300 kW class.

Kohler · REOZ Series (Diesel Commercial Standby)

New

Kohler 300REOZJ

300 kW standby · Diesel · Liquid-cooled

300 kW diesel commercial standby generator powered by John Deere. Mid-range diesel workhorse for commercial, healthcare, and institutional applications.

Standby power: 300 kW
Voltage options: 277/480V, 120/208V, 120/240V
Frequency / Phase: 60 Hz · 1/3-phase
Engine: John Deere 6090HFG86 · 9L
EPA / Emissions: Tier 3
Alternator: Kohler 4UA13

commercialhealthcaredata-centerindustrial-lightgovernmentmission-critical

Overview#

The Kohler 300REOZJ is a 300-kilowatt diesel generator powered by a John Deere engine at 1800 RPM. Typical applications include commercial buildings, healthcare facilities, and institutional campuses.

Our service experience#

OnPoint Generators services Kohler REOZ diesel generators throughout Northern California. We typically structure accounts for mid-range diesel units around annual NFPA 110 service plus semi-annual fuel and filter inspections.

Engineering specifications

Physical

Length: 118.1 in
Width: 51.2 in
Height: 74.4 in
Wet weight: 5,400 lb

Fuel system & runtime

Fuel use @ full load: 22.2 GPH

Photos

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

Request a quote

Get pricing & lead time on the Kohler 300REOZJ

Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.

Request a quote →Download datasheet

Estimate runtime for the Kohler 300REOZJ

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

11.7 hours(0.5 days)

Fuel consumption ≈ 17.13 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Kohler 300REOZJ under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 250 hours or 12 months
Coolant change: Every 3000 hours
Air filter: Every 500 hours
Fuel filter: Every 500 hours
Major overhaul: ≈ 15,000 hours
Load bank test: Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

Component	Symptom	Typical hours	Severity
Fuel quality / degradation	Injector fouling, hard starting, filter clogging	4,380+	moderate
Turbocharger	Power loss, excessive smoke under load	12,000+	moderate
Battery (starting)	Failed to start, slow crank	8,760+	minor

Frequently Asked Questions

What engine powers the Kohler 300REOZJ?: The 300REOZJ uses a John Deere diesel engine running at 1800 RPM (model 6090HFG86).
What is the standby power rating of the 300REOZJ?: The 300REOZJ is rated at 300 kW standby per Kohler published specifications.
Does OnPoint service the Kohler 300REOZJ?: Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California, including the 300 kW class.

Tier 33-phasecommercialhealthcare

Need service or parts for the Kohler 300REOZJ?

We service every major OEM and stock genuine parts for the most common models.

Get A Quote Or call (831) 375-1463