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Kohler 125REOZJ Generator Set

The Kohler 125REOZJ is a 125 kW (156 kVA) Diesel standby generator set powered by a John Deere 4045HF285 engine. It is available at 120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 277/480 V and 347/600 V, 3-phase, 60 Hz and rated 188 A. It holds about 13.9 L (3.7 gal) of oil and 19.2 L (5.1 gal) of coolant, with a maximum ambient rating of 50 °C. Starting uses 1 battery rated 800 CCA at 12 V. The set measures 2700×1120×1527 mm (106.3×44.1×60.1 in) and weighs about 1270 kg (2800 lb). The same 4045HF285 engine also powers generator sets from AKSA, MQ Power and MTU.

125 kW
Standby
4.5 L
Displacement
13.9 L
Oil capacity
8
Document types

How to read your Kohler serial & model number →

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power125 kW
Standby kVA156
Prime power114 kW
EmissionsTier 3 EPA-Certified for Stationary Emergency Applications
ControllerDecision-Maker 3000, Decision-Maker 550
Oil capacity13.9 L
Voltage options120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 277/480 V, 347/600 V
Phase3
Rated current188 A
Power factor0.8
Battery cranking800 CCA
Battery voltage12 V
Battery quantity1
Coolant capacity19.2 L
Max ambient50 °C
Dimensions (L×W×H)2700×1120×1527 mm
Dry weight1226 kg

Engine

John Deere 4045HF285
Oil capacity13.9 L
Coolant capacity19.2 L
Displacement4.5 L
AspirationTurbocharged, Charge Air-Cooled
Rated speed1800 rpm

Maintenance & consumables

for the John Deere 4045HF285
ItemSpecCapacityPart #Interval
Air filterDry— find
Fuel filter— find
Fuel filterPrimaryGM50074 Amazon eBay $70.33
Fuel filterSecondaryGM50006 Amazon eBay $35.39
Oil filter×1GM32809 Amazon eBay $42.50
Belt352793 Amazon eBay $106.79
Oil12.0 L—

Compatible filters for the John Deere 4045HF285 — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.

  • Air filter: John Deere AL204809 John Deere AT390262 John Deere AT390261 John Deere AL119839 John Deere AL150285

Common questions

What is the power rating of the Kohler 125REOZJ?

The Kohler 125REOZJ is rated 125 kW standby (156.0 kVA).

What engine does the Kohler 125REOZJ use?

The Kohler 125REOZJ is powered by the John Deere 4045HF285 engine.

What fuel does the Kohler 125REOZJ use?

The Kohler 125REOZJ runs on Diesel.

What is the oil capacity of the Kohler 125REOZJ?

The John Deere 4045HF285 engine in the Kohler 125REOZJ has an oil capacity of 13.9 liters.

Parts

1
Part #DescriptionQtySystem
PA-354809Exhaust Silencer, Critical (kit)Service part / kit Amazon eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Prime25%10.62.8
Prime50%19.55.1
Prime75%26.97.1
Prime100%34.89.2
Standby25%11.43.0
Standby50%21.15.6
Standby75%29.07.6
Standby100%37.49.9

Available documents

BrochureSpec sheetInstallation manualReferenceParts manualService manualWiring diagramwiring_diagrams