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Kohler 20REOZD Generator Set

The Kohler 20REOZD is a 20 kW diesel standby generator set.

20 kW
Standby
7
Document types

How to read your Kohler serial & model number →

Specifications

Fueldiesel
Standby power20 kW
ControllerDecision-Maker 3000
AlternatorGM78570-MA6

Maintenance & consumables

ItemSpecCapacityPart #Interval
Air filter×1GM42265 Amazon eBay PartsGeek
Fuel filter×1GM32359 Amazon eBay $26.87 PartsGeek
Oil filter×1252834 Amazon eBay $27.95 PartsGeek
Belt×1225022 Amazon eBay $65.00 PartsGeek

Common questions

What is the power rating of the Kohler 20REOZD?

The Kohler 20REOZD is rated 20 kW standby.

What fuel does the Kohler 20REOZD use?

The Kohler 20REOZD runs on diesel.

What alternator does the Kohler 20REOZD use?

The Kohler 20REOZD uses a GM78570-MA6 alternator.

Troubleshooting

4

Symptoms & remedies

SymptomCauseRemedy
Generator does not startFaulty starter motor or batteryCheck and replace the starter motor if necessary. Check and charge the battery.
Engine overheatsCoolant level is low, thermostat is faulty, radiator fins are dirtyAdd coolant to recommended level. Replace thermostat if it is faulty. Clean radiator fins.
Generator produces insufficient powerFuel filter is clogged, governor settings are incorrectClean or replace the fuel filter. Adjust governor settings as per manufacturer's instructions.
Engine runs roughAir intake system is dirty, fuel solenoid is faultyInspect and clean air intake system. Check and replace fuel solenoid if necessary.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Parts

11
Part #DescriptionQtySystem
225006Gasket, thermostat1Gasket PartsGeek
225022Belt, fan1Belt Amazon eBay $65.00 PartsGeek
249865Gasket, thermostat1Gasket PartsGeek
252834Filter, oil1Oil filter Amazon eBay $27.95 PartsGeek
GM28823Sensor, temperature1Sensor PartsGeek
GM32359Filter, fuel1Fuel filter Amazon eBay $26.87 PartsGeek
GM34387Thermostat1Thermostat PartsGeek
GM42265Element, air cleaner1Air filter Amazon eBay PartsGeek
GM42266Element, air cleaner1Air filter Amazon eBay $22.50 PartsGeek
GM47465Filter, oil1Oil filter Amazon eBay $23.52 PartsGeek
223316Fuse, 10 A, 250 V2Service part / kit PartsGeek

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.

Available documents

Brochure — 10REOZDC G6096 (Kohler)Installation manual — tp6393 (Kohler)Installation manual — tp6609 (Kohler)Installation manual — tp6795 (Kohler)Installation manual — tt1364 (Kohler)Reference — g260823 (Kohler)Owner's manual — tp6392 (Kohler)Parts manual — tp6802 (Kohler)Service manual — tp6394 (Kohler)Service manual — tp6794 (Kohler)Wiring diagram — adv8857 (Kohler)