What engine powers the Kohler 1250ROZMC?

The 1250ROZMC uses a Mitsubishi diesel engine running at 1500 RPM. Refer to the Kohler spec sheet for complete engine details.

Why does the 1250ROZMC run at 1500 RPM?

The ROZMC series runs at 1500 RPM for 50 Hz export applications. These units are non-certified for EPA and are intended for markets without US emissions requirements.

Does OnPoint service the Kohler 1250ROZMC?

Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California, including the 1120 kW class.

What engine powers the Kohler 1250ROZMC?

The 1250ROZMC uses a Mitsubishi diesel engine running at 1500 RPM. Refer to the Kohler spec sheet for complete engine details.

Why does the 1250ROZMC run at 1500 RPM?

The ROZMC series runs at 1500 RPM for 50 Hz export applications. These units are non-certified for EPA and are intended for markets without US emissions requirements.

Does OnPoint service the Kohler 1250ROZMC?

Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California, including the 1120 kW class.

Kohler · REOZ Series (Diesel Industrial Large)

New

Kohler 1250ROZMC

1120 kW standby / 1016 kW prime · Diesel · Liquid-cooled

1120 kW diesel 1500 RPM non-certified industrial generator powered by Mitsubishi. Mission-critical standby for data centers, hospitals, and large commercial facilities.

Standby power: 1120 kW / 1016 kW prime
Voltage options: 277/480V, 4160V, 12470V, 13200V, 13800V
Frequency / Phase: 50 Hz · 3-phase
Engine: Mitsubishi See spec sheet · 49L
Alternator: Kohler 7M4046

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Overview#

The Kohler 1250ROZMC is a 1120-kilowatt standby (1016 kW prime) diesel generator designed for 1500 RPM / 50 Hz operation. This non-certified unit is intended for export and non-regulated markets where US EPA certification is not required.

Our service experience#

OnPoint Generators services Kohler REOZ diesel generators throughout Northern California. Units in this class require specialized service capabilities including medium-voltage expertise and large-capacity load bank testing.

Engineering specifications

Physical

Length: 241.1 in
Width: 87.9 in
Height: 101.2 in
Wet weight: 26,500 lb

Fuel system & runtime

Fuel use @ full load: 93.6 GPH
Fuel use @ 75% load: 69.4 GPH

Photos

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Estimate runtime for the Kohler 1250ROZMC

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

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Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

2.8 hours(0.1 days)

Fuel consumption ≈ 72.21 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 1250ROZMC under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 500 hours or 12 months
Coolant change: Every 6000 hours
Air filter: Every 1000 hours
Fuel filter: Every 500 hours
Major overhaul: ≈ 20,000 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 injection pump / injectors	Hard starting, black smoke, uneven cylinder loading	10,000+	moderate
Turbocharger	Power loss, excessive exhaust smoke, oil carryover	12,000+	moderate
Cooling system (hoses / thermostat)	Overtemperature fault, coolant loss	10,000+	minor
Battery (starting)	Slow crank, failed exercise	8,760+	minor

Frequently Asked Questions

What engine powers the Kohler 1250ROZMC?: The 1250ROZMC uses a Mitsubishi diesel engine running at 1500 RPM. Refer to the Kohler spec sheet for complete engine details.
Why does the 1250ROZMC run at 1500 RPM?: The ROZMC series runs at 1500 RPM for 50 Hz export applications. These units are non-certified for EPA and are intended for markets without US emissions requirements.
Does OnPoint service the Kohler 1250ROZMC?: Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California, including the 1120 kW class.

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