HomeCummins/OnanCummins/Onan lsg-875

Cummins/Onan lsg-875 Generator Set

The Cummins/Onan lsg-875 is a 70 kW (87.5 kVA) Natural Gas standby generator set powered by a Ford LSG 875-6005A engine. It is available at 120/240 V, 120/208 V, 127/220 V, 139/240 V, 240/416 V, 254/440 V, 277/480 V and 347/600 V, 3-phase, 60 Hz and rated 210 A. It holds about 6.2 L (1.6 gal) of oil and 28 L (7.4 gal) of coolant. Starting uses 1 group-SEE battery rated 259 CCA at 12 V. The set measures 1940×880×1940 mm (76.4×34.6×76.4 in) and weighs about 901 kg (1986 lb).

70 kW
Standby
7.5 L
Displacement
6.2 L
Oil capacity
1
Document types

How to read your Cummins/Onan serial & model number →

Specifications

FuelNatural Gas
Frequency60.0 Hz
Standby power70 kW
Standby kVA87
Prime power60 kW
ControllerUR 15
Oil capacity6.2 L
AlternatorUR 15 (4-pole, Class F insulation)
Voltage options120/240 V, 120/208 V, 127/220 V, 139/240 V, 240/416 V, 254/440 V, 277/480 V, 347/600 V
Phase3
Rated current210 A
Power factor0.8
Circuit breaker15 A
Battery groupSEE
Battery cranking259 CCA
Battery voltage12 V
Battery quantity1
Coolant capacity28 L
Dimensions (L×W×H)1940×880×1940 mm
Dry weight901 kg

Engine

Ford LSG 875-6005A
Oil capacity6.2 L
Coolant capacity28.0 L
Displacement7.5 L
AspirationTurbocharged
Rated speed1800 rpm

Maintenance & consumables

for the Ford LSG 875-6005A
ItemSpecCapacityPart #Interval
Air filterAir Filter find
Fuel filterFuel Filter find
Oil filterOil Filter find
BeltBelt find
CoolantCoolant28.0 L
OilEngine Oil6.2 L

Common questions

What is the power rating of the Cummins/Onan lsg-875?

The Cummins/Onan lsg-875 is rated 70 kW standby (87.5 kVA).

What engine does the Cummins/Onan lsg-875 use?

The Cummins/Onan lsg-875 is powered by the Ford LSG 875-6005A engine.

What fuel does the Cummins/Onan lsg-875 use?

The Cummins/Onan lsg-875 runs on Natural Gas.

What is the oil capacity of the Cummins/Onan lsg-875?

The Ford LSG 875-6005A engine in the Cummins/Onan lsg-875 has an oil capacity of 6.2 liters.

What alternator does the Cummins/Onan lsg-875 use?

The Cummins/Onan lsg-875 uses a UR 15 alternator. It has 4 poles. Insulation class F.

Troubleshooting

9

Symptoms & remedies

SymptomRemedy
Engine stops cranking and fault lamp lights, after cranking approximately 75 seconds.See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting problem, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset, then back to the required running position.
Fault lamp lights immediately after engine starts.Check for: Overspeed condition as engine starts.
Fault lamp lights and engine shuts down after running for a period.A. Oil level. Engine will shut down if sensor is closed. b. Check engine manual for troubleshooting oil system. c. High engine temperature. Check coolant level; check water flow (city water cooled systems); check radiator for free air flow, and fan belts for tightness. See engine manual for troubleshooting cooling system. d. Check for faulty oil pressure sensor or faulty high engine temperature sensor.
Engine runs, shuts down and cranks for 75 seconds. Cranking cycle stops; fault lamp lights.Check fuel supply. Check ignition system.
Fault lamp lights, no fault exists.To check a no-fault condition, disconnect leads from TB11 terminals 29, 30 and 31. If fault lamp lights with leads disconnected, replace engine monitor board. Reconnect leads.
Overcrank fault lamp lights and engine stops cranking after approximately 75 seconds.See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting fault, reset engine monitor relay by placing Run-Stop/Reset-Remote switch to Stop/Reset position, depressing Reset button, then to the required running position.
Engine runs, shuts down, cranks for 75 seconds, cranking cycle stops, overcrank light ON.Check fuel supply, check ignition.
Low oil pressure shutdown.A. Oil level. Replenish if necessary. b. Sensor. Faulty sensor will shut down engine. c. Refer to engine service manual for troubleshooting guide for oil system.
High engine temperature shutdown.A. Coolant level. Replenish if necessary. b. City water cooled set

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

Parts

5
Part #DescriptionQtySystem
C20E-6734-Aold drain plug sealSeal PartsGeek
EQEE-6734-AAmetric drain plug sealSeal PartsGeek
ESAE-6734-AAdrain plug sealSeal PartsGeek
DZAE-6730-AAoil pan drain plugService part / kit PartsGeek
E5AE-6730-AAmetric drain plugService 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.

Fuel consumption

RatingLoadL/hgal/h
Prime100%1000.037.25
Standby100%7.88.2

Available documents

Owner's manual — 928-0121 Onan EN ENT Genset Operator's manual (10-1986) (Cummins/Onan)Service manual — 194-208 Ford LSG875 460CID Engine Service manual Apr1992 (Power Products)

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