What is the difference between the 100REOZJ4 and the 100REOZJF?

The 100REOZJ4 is the Tier 4 Final emissions variant while the 100REOZJF uses a Tier 3 engine. The J4 meets stricter EPA emissions standards with aftertreatment, while the JF uses a simpler exhaust system.

What engine powers the Kohler 100REOZJ4?

The 100REOZJ4 uses a John Deere diesel engine rated for Tier 4 Final emissions compliance at 1800 RPM.

Does OnPoint service the Kohler 100REOZJ4?

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

Emergency? Call (831) 375-1463 — 24/7 response

Kohler · REOZ Series (Diesel Commercial Standby)

Kohler 100REOZJ4

Name: Kohler 100REOZJ4
Brand: Kohler
SKU: 100reozj4
Availability: InStock

105 kW standby / 96 kW prime · Diesel · Liquid-cooled

100 kW Tier 4 Final diesel commercial standby generator powered by John Deere. EPA Tier 4 Final emissions for stationary emergency use.

Standby power: 105 kW / 96 kW prime
Voltage options: 277/480V, 120/208V, 139/240V
Frequency / Phase: 60 Hz · 1/3-phase
Engine: John Deere 4045HFG09 · 4.5L
Alternator: Kohler

Commercial Healthcareindustrial-lightGovernment

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Overview#

The Kohler 100REOZJ4 is a 100-kilowatt Tier 4 Final diesel standby generator powered by a John Deere engine at 1800 RPM. The J4 designation indicates EPA Tier 4 Final emissions certification, making this unit suitable for installations in areas with strict air quality requirements. This model complements the standard 100REOZJF for applications where Tier 4 compliance is mandated.

Our service experience#

OnPoint Generators services Kohler REOZ diesel generators throughout Northern California. We provide annual NFPA 110 maintenance, load bank testing, and DPF/aftertreatment service for Tier 4 units.

Engineering specifications

Acoustic

Sound @ 7m, full load: 71 dBA
Enclosure: Open

Fuel system & runtime

Fuel use @ full load: 8.1 GPH
Fuel use @ 75% load: 6 GPH
Fuel use @ 50% load: 4.3 GPH

Documents & downloads

Spec sheets & manuals

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Estimate runtime for the Kohler 100REOZJ4

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

32.0 hours(1.3 days)

Fuel consumption ≈ 6.25 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 100REOZJ4 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: ≈ 15,000 hours
Load bank test: Every 12 months

Frequently Asked Questions

What is the difference between the 100REOZJ4 and the 100REOZJF?: The 100REOZJ4 is the Tier 4 Final emissions variant while the 100REOZJF uses a Tier 3 engine. The J4 meets stricter EPA emissions standards with aftertreatment, while the JF uses a simpler exhaust system.
What engine powers the Kohler 100REOZJ4?: The 100REOZJ4 uses a John Deere diesel engine rated for Tier 4 Final emissions compliance at 1800 RPM.
Does OnPoint service the Kohler 100REOZJ4?: Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California.

Why we recommend Kohler

Kohler is our primary recommendation for commercial standby power. We sell and service the full Kohler line — RCA residential, RCL light commercial, KG industrial diesel, and REOZ large-frame — and our technicians are factory-trained on every product family.

We are an authorized Kohler dealer with factory-trained technicians. Kohler is the majority of our new generator sales today, spanning residential through large industrial. Our parts inventory is stocked for same-day Kohler service.

See all Kohlergenerators →

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Last reviewed: June 13, 2026