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Cummins/Onan DFMB Generator Set

The Cummins/Onan DFMB is a 1500 kW (1875 kVA) standby generator set powered by a Cummins/Onan KTTA50-G2 engine. It is available at 220/380 V, 240/416 V, 277/480 V, 254/440 V, 347/600 V and 2400/4160 V, three phase-phase and 60 Hz. It holds about 160 L (42.3 gal) of oil and 386.1 L (102.0 gal) of coolant, with a maximum ambient rating of 50 °C. The set measures 5652×2277×2507 mm (222.5×89.6×98.7 in) and weighs about 10977 kg (24200 lb).

1500 kW
Standby
50.3 L
Displacement
160.0 L
Oil capacity
3
Document types

Specifications

Frequency60.0 Hz
Standby power1500 kW
Standby kVA1875
Prime power1250 kW
ControllerPowerCommand
Oil capacity160.0 L
Voltage options220/380 V, 240/416 V, 277/480 V, 254/440 V, 347/600 V, 2400/4160 V
Phasethree phase
Battery voltage24 V
Coolant capacity386.1 L
Max ambient50 °C
Dimensions (L×W×H)5652×2277×2507 mm
Dry weight10977 kg

Engine

Cummins/Onan KTTA50-G2
Oil capacity151.4 L
Displacement50.3 L
Aspirationturbocharged and aftercooled
Rated speed1800 rpm

Maintenance & consumables

for the Cummins/Onan KTTA50-G2
ItemSpecCapacityPart #Interval
Air filterMaximum Air Cleaner Restriction, 25.0 in. H2O (6.2 kPa)— find
Belt— find
Coolant386.1 L—
Fuel filter— find
OilCummins151.4 L—
Oil filterFive spin-on, full flow— find

Parts

24
Part #DescriptionQtySystem
140-2501Cleaner, Air (Disposable)2Air filter kuduparts $185.00
140-2502Band, Mounting – Air Cleaner4Air filter Amazon eBay $59.99
502-1162Connector, Hose (3/8")2Hose buy
503-0685Clamp, Hose2Hose buy
503-1484Elbow, Hose (45 Deg) (7" ID)2Hose buy
503-1620Hose – Bulk (3/8" ID) (Order by the Foot)-Hose buy
503-1870-11Clamp, Hose2Hose buy
503-1870-12Clamp, Hose2Hose buy
140-1260Fitting, Safety Filter2Service part / kit NAPA $10.13 Amazon eBay $35.00
140-1548Indicator, Service2Service part / kit NAPA $32.16 Amazon eBay $91.60
140-2508Tube, Air Inlet (7" x 9" - 3/4")2Service part / kit Amazon eBay $129.95
140-2528Shield – Air In Heat1Service part / kit buy
309-0635-02Valve, Check2Service part / kit buy
503-1717Elbow, Reducer (45 Deg) (7" ID to 6" ID)2Service part / kit buy
503-1720Insert, Reducer (6" OD to 5-1/2" ID)2Service part / kit buy
505-0017Bushing, Pipe – Reducer (3/8" to 1/4")2Service part / kit dieselpartscenter $2032.36
505-0376Elbow – 45 Deg (3/8")2Service part / kit buy
526-0030Washer, Flat (3/8")8Service part / kit buy
800-0055Screw, Cap – Hex Head (3/8–16 x 2-1/4")8Service part / kit buy
800-0094Screw, Cap – Hex Head (1/2–13 x 2")8Service part / kit buy
821-0029Screw, Self–Locking – Hex Washer Head (3/8–16 x 3/4")8Service part / kit buy
821-0033Screw, Self–Locking – Hex Washer Head (7/16–14 x 3/4")8Service part / kit buy
821-5004-03Screw, Self-Locking – Hex Washer Head (3/8–16 x 1")2Service part / kit buy
870-0281Nut, Self-Locking – Hex Washer Head (3/8–16)2Service 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.

Available documents

Spec sheetParts manualService manual