Katolight D125 Generator — 125 kW John Deere | OnPoint

Name: Katolight D125 (John Deere)
Brand: Katolight
Availability: PreOrder

Overview#

The Katolight D125 is a 125 kW diesel standby generator powered by a John Deere 6068HF120 engine — a 6.8-liter, six-cylinder turbocharged diesel from John Deere's widely deployed 6068 platform. This unit occupied the upper end of Katolight's John Deere Diesel Series, serving mid-range commercial buildings, schools, churches, and municipal facilities that needed more power than the four-cylinder 4045-based models could deliver.

Katolight is a discontinued brand, acquired by MTU (now Rolls-Royce Power Systems) in 2006 and rebranded as MTU Onsite Energy. No new Katolight units are manufactured, but the D125 remains one of the more commonly encountered Katolight models in the field due to its popularity in the 100-150 kW commercial standby segment. The John Deere 6068 engine has excellent parts availability through John Deere's nationwide dealer network and a deep independent aftermarket.

OnPoint provides full lifecycle support for Katolight D125 installations, from routine preventive maintenance to major engine overhauls and control system modernization. These units, properly maintained, can deliver decades of reliable standby service.

Estimate runtime for the Katolight D125 (John Deere)

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

29.6 hours(1.2 days)

Fuel consumption ≈ 6.75 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 Katolight D125 (John Deere) 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 quality / degradation	Hard starting, filter clogging, reduced power	4,380+	moderate
Turbocharger	Power loss, excessive smoke under load	12,000+	moderate
Battery	Failed to start, slow crank	8,760+	minor

Frequently Asked Questions

Are parts still available for the Katolight D125?

Yes. The D125 uses a John Deere 6068 engine, which has excellent parts availability through John Deere's nationwide dealer network and a deep independent aftermarket. This is one of the most commonly encountered Katolight models still in service.

What happened to the Katolight brand?

Katolight was acquired by MTU (now Rolls-Royce Power Systems) in 2006 and rebranded as MTU Onsite Energy. No new Katolight units are manufactured, but the large installed base is fully supported through aftermarket parts and independent service providers like OnPoint.

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