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Kohler 30REOZJ Generator Set

The Kohler 30REOZJ is a 30 kW (38 kVA) Diesel standby generator set powered by a John Deere 4024TF281D engine. It operates at 60 Hz. It holds about 8.2 L (2.2 gal) of oil and 11.4 L (3.0 gal) of coolant.

30 kW
Standby
2.4 L
Displacement
8.2 L
Oil capacity
4
Document types

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Typical fuel consumption for 30–35 kW Diesel generators →

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Specifications

FuelDiesel
Frequency60.0 Hz
Standby power30 kW
Standby kVA38
Prime power25 kW
ControllerDecision-Maker 3000, Decision-Maker 550
Oil capacity8.2 L

Engine

John Deere 4024TF281D
Oil capacity8.2 L
Coolant capacity11.4 L
Displacement2.4 L
AspirationTurbocharged
Rated speed1800 rpm

Service specifications

30
TypeItemValueUnitCondition
Other10 in. weld flange bolt circle diameter B361.95mm (14.25 in.)
Other10 in. weld flange outside diameter C406.4mm (16.0 in.)
Other10 in. weld flange quantity of bolts / bolt hole diameter D12, 25.40mm (1.00 in.)
Other12 in. weld flange bolt circle diameter B431.80mm (17.00 in.)
Other12 in. weld flange outside diameter C482.6mm (19.0 in.)
Other12 in. weld flange quantity of bolts / bolt hole diameter D12, 25.40mm (1.00 in.)
Other14 in. weld flange bolt circle diameter B476.25mm (18.75 in.)
Other14 in. weld flange outside diameter C533.4mm (21.0 in.)
Other14 in. weld flange quantity of bolts / bolt hole diameter D12, 28.58mm (1.13 in.)
Other16 in. weld flange bolt circle diameter B539.75mm (21.25 in.)
Other16 in. weld flange outside diameter C596.9mm (23.5 in.)
Other16 in. weld flange quantity of bolts / bolt hole diameter D16, 28.58mm (1.13 in.)
Other18 in. weld flange bolt circle diameter B577.85mm (22.75 in.)
Other18 in. weld flange outside diameter C635.0mm (25.0 in.)
Other18 in. weld flange quantity of bolts / bolt hole diameter D16, 31.75mm (1.25 in.)
Other20 in. weld flange bolt circle diameter B635.00mm (25.00 in.)
Other20 in. weld flange outside diameter C698.5mm (27.5 in.)
Other20 in. weld flange quantity of bolts / bolt hole diameter D20, 31.75mm (1.25 in.)
Other5 in. weld flange bolt circle diameter B215.90mm (8.50 in.)
Other5 in. weld flange outside diameter C241.30mm (9.50 in.)
Other5 in. weld flange quantity of bolts / bolt hole diameter D8, 22.23mm (0.88 in.)
Other6 in. weld flange bolt circle diameter B254.0mm (10.0 in.)
Other6 in. weld flange outside diameter C279.4mm (11.0 in.)
Other6 in. weld flange quantity of bolts / bolt hole diameter D8, 22.23mm (0.88 in.)
Other8 in. weld flange bolt circle diameter B298.45mm (11.75 in.)
Other8 in. weld flange outside diameter C342.9mm (13.5 in.)
Other8 in. weld flange quantity of bolts / bolt hole diameter D8, 22.23mm (0.88 in.)
OtherWeld flange angle A (10, 12, 14 in. nominal pipe size)30deg.
OtherWeld flange angle A (16, 18, 20 in. nominal pipe size)22.5deg.
OtherWeld flange angle A (5, 6, 8 in. nominal pipe size)45deg.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

How many kW is the Kohler 30REOZJ?

The Kohler 30REOZJ is rated 30 kW standby (38.0 kVA).

What engine does the Kohler 30REOZJ use?

The Kohler 30REOZJ is powered by the John Deere 4024TF281D engine.

Is the Kohler 30REOZJ diesel or gas?

The Kohler 30REOZJ runs on Diesel.

How much oil does the Kohler 30REOZJ take?

The John Deere 4024TF281D engine in the Kohler 30REOZJ has an oil capacity of 8.2 liters.

Parts

155model family
Part #DescriptionQtySystem
222337Air Cleaner, Heavy Duty1Air filter buy
222338Air Cleaner, Heavy Duty1Air filter buy
223595Thermostat1Thermostat buy
223604Filter, oil1Oil filter Amazon $36.99 eBay $13.00
223626Gasket1Gasket buy
223640Belt, 11/16 x 49 1/2 in.1Belt Amazon eBay $149.99
223673Filter, oil1Oil filter Amazon $53.57 eBay $26.99 KuduParts $14.00
223676Thermostat2Thermostat Amazon eBay
223762Thermostat Gasket1Gasket buy
223941Injector1Injector buy
223953Filter, fuel1Fuel filter Amazon $59.00 eBay $80.00
223959Fan Belt1Belt Amazon $119.69 eBay
223965Injector1Injector buy
224012Gasket1Gasket Amazon eBay
224171Injector1Injector buy
224256Fan Belt1Belt Amazon eBay $29.99
224263Belt, 11/16 x 49 1/2 in.1Belt Amazon eBay $20.00
224299Injector1Injector buy
224795Filter, fuel (round)1Fuel filter Amazon eBay
241062Plug, drainSpark plug Amazon eBay $24.00
241308Switch, temperature1Sensor Amazon eBay $182.00
241481Switch, high temperature 268298 Sender, water temperature1Sensor Amazon eBay
241623Sensor, speed (all models)Sensor Amazon eBay
241927Sensor, speed1Sensor Amazon eBay
253107Element, Air Cleaner1Air filter Amazon $43.25 eBay $69.00
253108Element, air cleaner1Air filter Amazon $32.19 eBay $71.99
254477Element, air cleaner1Air filter Amazon $28.99 eBay KuduParts $233.99
254832Coolant Level Sensor (serial 363369 and after)1Sensor buy
255520Hose, reducerHose Amazon eBay FridayParts $33.99
258883Cleaner assembly, air1Air filter buy
265461Line, flex. fuel, 18”Hose Amazon eBay
268298Sender, water temperature gaugeSensor Amazon eBay
268371Alternator Assembly1Alternator buy
269373Alternator Assembly5Alternator Amazon eBay
273417Hose, upper radiator1Hose Amazon eBay
273418Hose, lower radiator1Hose Amazon eBay
273442Hose, hump 3 id x 5 1/21Hose buy
273443Hose, lower radiator1Hose buy
273444Hose, upper radiator1Hose Amazon
273462Hose, upper radiator1Hose buy
273520Sensor, low coolantSensor Amazon eBay
273692Adapter, water temperature sensor1Seal Amazon eBay
273693O-ring, 1.475 ID x 0.118 in. rubber1Seal Amazon eBay
273758Pickup, RPM1Sensor buy
273777Hose, lower radiator1Hose Amazon
273930Hose, lower radiator1Hose buy
276574Hose, molded1Hose Amazon
282814Alternator Assembly1Alternator buy
282897Gauge, oil pressure1Fluid Amazon eBay $20.00
291891Solenoid, starterStarter Amazon eBay $42.81
328006Hose, reducer (3.00 in. to 2.50 in. ID)1Air filter Amazon eBay
328308Pressure Switch1Sensor buy
328309Switch assembly, pressure (oil pressure)1Fluid Amazon eBay $45.00
336101Hose, upper radiator1Hose buy
336445Thermostat Gasket1Gasket buy
336545Fuel Filter1Fuel filter Amazon $37.15 eBay
336923Switch, high temperature shutdown1Sensor buy
343473Sender, oil pressure1Sensor eBay
347270Sensor, low coolant (serial 363369 and after)1Sensor buy
352102Hose, upper radiator1Hose buy
352192Hose, upper radiator1Hose buy
352193Hose, lower radiator1Hose buy
352335Hose1Hose buy
352337Switch, sensor (water temp.)1Sensor buy
352505Switch, sensor (water temp.)1Sensor buy
352522Hose, upper radiator1Hose buy
352523Hose, lower radiator1Hose buy
352910Hose, 3 x 2.251Hose buy
A-233999Heat sink1Heat sink buy
A-253104Air cleaner assembly1Air filter Amazon Amazon eBay eBay
A-273699Air Cleaner Assembly1Air filter Amazon Amazon eBay eBay
A-273700Air cleaner1Air filter buy
B-258545Heat sink1Heat sink buy
X-312-41Hose, 5/8 x 4.5 in.1Hose buy
X-373-10Hose, 3/4 ID x 66 in.1Hose buy
X-373-11Hose, 3/4 ID x 60 in.1Hose buy
X-373-12Hose, 3/4 ID x 78 in. (early)1Hose buy
X-373-13Hose1Hose buy
X-422-26Hose, bypass (thermostat)1Hose buy
X-507-1Hose, reducer 2.5 ID x 2.25 ID1Hose buy
X-577-38Hose, 0.625 in. ID x 20 in.1Hose buy
X-577-47Hose, oil-proof1Hose buy
X-577-8Hose, oil-proof1Hose buy
X-577-9Hose, oil-proof1Hose buy
X-6350-1Hose1Hose buy
223316Fuse, 10 A, 250 V1Service part / kit Amazon $171.06 eBay $31.37
224357Cap, radiator 7 psi (48 kPa), 3.16 in.1Service part / kit buy
224358Cap, radiator (7 psi)Service part / kit Amazon eBay
238736Voltmeter1Service part / kit Amazon eBay $549.00
243273Fuse, 3 amp5Service part / kit Amazon eBay
253329DC Voltmeter1Service part / kit buy
255126Bulb (lamp no. 1892)1Service part / kit Amazon eBay
257020Fan, generator1Service part / kit buy
257077Actuator, magnetic1Service part / kit buy
257080Exciter assembly1Service part / kit buy
257081Exciter assembly1Service part / kit buy
257173Fan, generator (4SW and 4VW)1Service part / kit eBay
257569Exciter assembly, field1Service part / kit buy
257855Fan, generator (4UAW)1Service part / kit eBay
257963Exciter assembly, field1Service part / kit buy
259391Relay1Service part / kit Amazon eBay $53.76
272701Valve, oil drain1Service part / kit Amazon eBay
273404Switch assembly, level (includes 47, 48 and 49)Service part / kit Amazon eBay
273463Plug, 1-5/8–12 class 2A str. thd., 1/2–14 NPT tap1Service part / kit Amazon eBay
273716Solenoid, fuel shutoff1Service part / kit buy
276691Block Heater (Kit 276509)1Service part / kit Amazon eBay
276941Governor throttle kit (replaces governor ball joint linkage)1Service part / kit Amazon eBay
280133Cable, jumper1Service part / kit buy
282800AC Ammeter1Service part / kit buy
282801AC Ammeter1Service part / kit buy
282802AC Ammeter1Service part / kit buy
282803AC Ammeter1Service part / kit buy
282804AC Ammeter1Service part / kit buy
282805AC Ammeter1Service part / kit buy
282806AC Ammeter1Service part / kit buy
282807AC Ammeter1Service part / kit buy
282808AC Ammeter1Service part / kit buy
282816*Voltmeter, AC1Service part / kit buy
282817AC Voltmeter1Service part / kit buy
282818*Meter, Frequency1Service part / kit buy
282898Strip, terminal (9-terminal)1Service part / kit buy
283645Fuse, 15 amp5Service part / kit Amazon eBay
291207Fuse, 1.5 amp5Service part / kit Amazon eBay
291269Heater, strip (anti-condensation)2Service part / kit buy
291740Rectifier or Coil5Service part / kit Amazon eBay
295069Meter, frequency1Service part / kit Amazon eBay
326228Block Heater1Service part / kit Amazon eBay
347715Cap, radiator 9 psi (62 kPa)1Service part / kit buy
352565AC Ammeter1Service part / kit buy
A-255041Potentiometer Assembly1Service part / kit buy
A-257099Circuit board, FR-II activator1Service part / kit Amazon eBay
A-336415Controller Includes * *Circuit Board, Dec-3+ Main1Service part / kit buy
A-336430Indicator Board (variations 78, 79)1Service part / kit buy
A-336432Main circuit board1Service part / kit Amazon
B-258549HEATSINK ASSEMBLY1Service part / kit buy
B-292357Indicator Board1Service part / kit Amazon eBay
B-292789Regulator assembly, voltage1Service part / kit buy
B-292902Photo Board / Split Activator1Service part / kit Amazon eBay FridayParts $271.50
C-255670Voltage Regulator1Service part / kit Amazon eBay
G-292806Main Circuit Board1Service part / kit Amazon eBay $550.00
X-256-3Terminal1Service part / kit Amazon eBay
X-256-5Valve, drain1Service part / kit Amazon
X-545-100Cable, battery1Service part / kit buy
X-545-101Cable, battery1Service part / kit buy
X-545-111Cable, battery1Service part / kit buy
X-545-132Cable, battery1Service part / kit buy
X-545-97Cable, battery1Service part / kit buy
X-545-99Cable, battery1Service part / kit buy
X-57-60Breaker, circuit1Service part / kit buy
X-758-2Bearing, ball1Service part / kit Amazon eBay $83.65
X-758-6Ball bearing1Service part / kit Amazon eBay $50.00
X-758-9Bearing, ball (4UAW)1Service part / kit eBay
X-796-1Breaker, circuit (Kits PA-255127 and PA-255127-SD)1Service part / kit buy
X-796-2Breaker, circuit (Kits PA-255130 and PA-255130-SD)1Service part / kit buy
X-796-3Breaker, circuit (Kits PA-255131 and PA-255131-SD)1Service part / kit buy

Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Prime25%3.40.9
Prime50%5.21.4
Prime75%7.21.9
Prime100%9.42.5
Standby25%3.91.0
Standby50%5.81.5
Standby75%8.02.1
Standby100%10.62.8

Available documents

Spec sheet (Kohler)Reference — G6-39 0918AZ (Kohler)Reference — Reinstated Enclosures (Kohler)Parts manual — tp5408 (Kohler)Service manual — tp5851 (Kohler)Service manual — tp6798 (Kohler)Service manual — tt1454 (Kohler)