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Kohler 40 REOZK4 Generator Set

The Kohler 40 REOZK4 is a 40 kW (50 kVA) Diesel standby generator set powered by a Kohler KDI 2504 TCR 2.5 L engine. It is available at 120/208 V, 120/240 V, 277/480 V and 347/600 V, 60 Hz. It holds about 11.2 L (3.0 gal) of oil and 17.2 L (4.5 gal) of coolant, with a maximum ambient rating of 50 °C. Starting uses 1 battery rated 950 CCA at 12 V. The set measures 2206×1016×1622 mm (86.9×40.0×63.9 in), weighs about 1442 kg (3179 lb) and produces 68 dBA at 7 m. An integrated tank holds 293 L (77.4 gal), roughly 24 hours of runtime.

40 kW
Standby
2.5 L
Displacement
11.2 L
Oil capacity
5
Document types

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Specifications

FuelDiesel
Frequency60.0 Hz
Standby power40 kW
Standby kVA50
Prime power36 kW
EmissionsTier 4 Final
ControllerDecision-Maker 3500
Oil capacity11.2 L
Voltage options120/208 V, 120/240 V, 277/480 V, 347/600 V
Power factor0.8
Circuit breaker150 A
Battery cranking950 CCA
Battery voltage12 V
Battery quantity1
Coolant capacity17.2 L
Max ambient50 °C
Dimensions (L×W×H)2206×1016×1622 mm
Dry weight1442 kg
Sound level68.0 dBA @ 7 m
Fuel tank293.0 L
Tank runtime24 hr

Engine

Kohler KDI 2504 TCR 2.5 L
Oil capacity11.2 L
Coolant capacity17.2 L
Displacement2.5 L
AspirationTurbocharged
Rated speed1800 rpm

Maintenance & consumables

for the Kohler KDI 2504 TCR 2.5 L
ItemSpecCapacityPart #Interval
Air filterDry002175339000 buy
Fuel filterPrimary 5 Microns @ 98% Efficiency find
Oil filterCartridge×1 find
OilAPI CJ-4 or ACEA E6--E911.2 L

Common questions

What is the power rating of the Kohler 40 REOZK4?

The Kohler 40 REOZK4 is rated 40 kW standby (50.0 kVA).

What engine does the Kohler 40 REOZK4 use?

The Kohler 40 REOZK4 is powered by the Kohler KDI 2504 TCR 2.5 L engine.

What fuel does the Kohler 40 REOZK4 use?

The Kohler 40 REOZK4 runs on Diesel.

What is the oil capacity of the Kohler 40 REOZK4?

The Kohler KDI 2504 TCR 2.5 L engine in the Kohler 40 REOZK4 has an oil capacity of 11.2 liters.

Parts

41
Part #DescriptionQtySystem
GM84564Gasket, Acc Panel1Gasket buy
GM84565Gasket, E-Stop Box1Gasket buy
GM86061Tube, Turbo1Turbocharger buy
GM86224Hose, Air Intake1Hose buy
GM88480Guard, Belt Upper (LS)1Belt buy
292364Switch, emergency stop1Service part / kit buy
324562Cap, Rain 2.5” (fits 2.50” tube)1Service part / kit buy
358384Breaker, Circuit3Service part / kit buy
GB31311173101Decal, Emergency Stop1Service part / kit buy
GM33904Receptacle, GFCI Duplex2Service part / kit buy
GM33906Breaker, Circuit 15A2Service part / kit buy
GM49151Inlet, Flanged1Service part / kit buy
GM79886Case, Literature, Plastic (case only; no literature)1Service part / kit buy
GM84566Receptacle, 50A 125V/250V3Service part / kit buy
GM84567Cover, 50A Waterproof3Service part / kit buy
GM85982--1Engine, Lombardini KDI2504TCR1Service part / kit buy
GM86447Silencer1Service part / kit buy
GM86770-14Insulation, Acoustic Foam1Service part / kit buy
GM87823Bracket, Tube Support1Service part / kit buy
GM89314-1Insulation, Acoustic Foam1Service part / kit buy
GM89314-2Insulation, Acoustic Foam1Service part / kit buy
GM89314-3Insulation, Acoustic Foam1Service part / kit buy
GM89314-4Insulation, Acoustic Foam1Service part / kit buy
GM89355Eyebolt1Service part / kit buy
GM90375Cover, GFCI Receptacle2Service part / kit buy
GM90379-1Connector, Cam Lock Black1Service part / kit buy
GM90379-2Connector, Cam Lock White1Service part / kit buy
GM90379-3Connector, Cam Lock Red1Service part / kit buy
GM90379-4Connector, Cam Lock Blue1Service part / kit buy
GM90379-5Connector, Cam Lock Green1Service part / kit buy
GM90380-1Cover, Cam Lock Black1Service part / kit buy
GM90380-2Cover, Cam Lock White1Service part / kit buy
GM90380-3Cover, Cam Lock Red1Service part / kit buy
GM90380-4Cover, Cam Lock Blue1Service part / kit buy
GM90380-5Cover, Cam Lock Green1Service part / kit buy
GM90398Decal, Lifting Point2Service part / kit buy
GM90463Lead, Camlock GND1Service part / kit buy
GM90464Lead, Camlock L01Service part / kit buy
GM90465Lead, Camlock L11Service part / kit buy
GM90466Lead, Camlock L21Service part / kit buy
GM90467Lead, Camlock L31Service part / kit buy

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%3.50.9
Prime50%6.11.6
Prime75%8.82.3
Prime100%11.73.1
Standby25%3.81.0
Standby50%6.61.7
Standby75%9.52.5
Standby100%12.63.3

Available documents

BrochureSpec sheetReferenceParts manualWiring diagram