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Northern Lights M673 Generator Set

The Northern Lights M673 is a 5 kW (8 kVA) Diesel standby generator set powered by a Lugger L673L engine. It is available at 120 V and 240 V, 1-phase, 60 Hz and rated 25 A. It holds about 3 L (0.8 gal) of oil. The set measures 688×434×513.2 mm (27.1×17.1×20.2 in) and weighs about 38 kg (84 lb).

5 kW
Standby
0.761 L
Displacement
3.0 L
Oil capacity
4
Document types

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power5 kW
Prime power4 kW
EmissionsTier II
ControllerDC Logic System
Oil capacity3.0 L
Voltage options120 V, 25 V, 240 V, 50 V
Phase1
Rated current25 A
Power factor1.0
Circuit breaker30 A
Dimensions (L×W×H)688×434×513 mm
Dry weight38 kg

Engine

Lugger L673L
Oil capacity2.2 L
Displacement0.761 L
Aspirationnaturally aspirated
Rated speed1800 rpm

Maintenance & consumables

for the Lugger L673L
ItemSpecCapacityPart #Interval
Air filter find
Fuel filterlarge spin-on fuel filter1000 hr find
Oil filterspin-on oil filter with bypass500 hr find
Belt500 hr find
Coolant
Oil3.1 qt200 hr

Common questions

What is the power rating of the Northern Lights M673?

The Northern Lights M673 is rated 5 kW standby.

What engine does the Northern Lights M673 use?

The Northern Lights M673 is powered by the Lugger L673L engine.

What fuel does the Northern Lights M673 use?

The Northern Lights M673 runs on Diesel.

What is the oil capacity of the Northern Lights M673?

The Lugger L673L engine in the Northern Lights M673 has an oil capacity of 2.2 liters.

Troubleshooting

18

Symptoms & remedies

SymptomCauseRemedy
Battery Will Not ChargeLoose or corroded connections, Sulfated or worn out batteries, Loose or defective alternator beltClean and tighten battery connections, Check specific gravity of each battery, Check electrolyte level of each battery, Adjust belt tension, Replace belt
Engine Hard to Start or Will Not StartLoose or corroded connections, Sulfated or worn out batteries, Loose or defective alternator beltClean and tighten loose battery and harness plug connection, Check specific gravity of each battery, Check electrolyte level of each battery, Adjust belt tension, Replace belt
Starter InoperativeCheck DC circuit breaker, Loose or corroded connectionsIf the breaker is tripped, reset it, Clean and tighten loose battery and harness plug connection
Starter Cranks SlowlyLow battery output, Crankcase oil too heavyBattery is too small, Battery cables are too small, Check specific gravity of each battery, Check electrolyte level of each battery, Fill with oil of appropriate viscosity, Clean and tighten all battery connections
Entire Electrical System Does Not FunctionCheck DC circuit breaker, Faulty connection, Sulfated or worn out batteries, Improper starting procedureIf breaker is tripped, reset it, Clean and tighten battery and harness plug connections, Check specific gravity and electrolyte level of each battery, See starting section of this manual, Take special note of Bypass Switch operation
No fuelCheck level of fuel in fuel tank
Engine Runs Irregularly or Stalls FrequentlyBelow normal engine temperature, Clogged primary fuel filter element, Clogged secondary fuel filter element, Water or dirt in the fuel system, Dirty or faulty injection nozzles, Air in fuel system, Improper type of fuel, Overheated engineRemove and check thermostat, Clean or replace filter element, Replace secondary filter element, Drain, flush, fill and bleed system, Have your dealer check injection nozzles, Inspect clamps and hoses on suction side of fuel pump for air leak, Consult fuel supplier and use proper type of fuel for operating condition, See “Engine Overheats” in next category
Lack of Engine PowerIntake air restriction, Clogged primary fuel filter element, Clogged secondary fuel filter elementService air cleaner, Clean or replace filter element, Replace filter element
Engine OverheatsImproper valve clearance, Dirty or faulty injection nozzles, Air in fuel system, Improper type of fuel, Water or dirt in the fuel system, Clogged primary fuel filter element, Clogged secondary fuel filter elementReset valves, Best done by dealer, Replace injectors, Best done by dealer, See your local dealer, Service air cleaner, Clean or replace filter element, Replace secondary filter element
High Fuel ConsumptionInjection pump out of timeSee your dealer
Low Oil PressureLow coolant level, Defective thermostat, Temperature gauge not working properlyFill crankcase to proper level, Fill tank or radiator to proper level, Check thermostats, Check water temperature with thermometer and replace gauge if necessary
High Oil ConsumptionDefective thermostat, Defective temperature gaugeRemove and check thermostat, Check water temperature with thermometer and replace gauge if necessary
Engine Emits Black or Gray Exhaust SmokeInsufficient oil, Defective muffler (back pressure too high), Injection pump out of time, Improper fuel, Below normal engine temperature, Dirty or faulty injection nozzlesCall your dealer, Have dealer check back pressure, Call your dealer, Use correct fuel for temperature, Check water temperature to see if temperature gauge is working properly
Engine KnocksDefective muffler (back pressure too high), Insufficient oil, Defective temperature gaugeHave dealer check back pressure, Call your dealer, Check water temperature with thermometer and replace gauge if necessary
Engine has shutdownCheck the temperature gauge. If above 205°F (96°C) for marine units or 230°F (110°C) for industrial units, shut off the engine immediately. Use the Trouble Shooting Guide on page 24 to isolate the cause of the overheat.
Temperature gauge shows temperature within normal range but shutdown is activatedCheck the engine crankcase oil level. If low, fill with recommended lubricating oil and restart. Watch the oil pressure gauge carefully and shut off the engine if it does not show a normal reading (20-60 PSI) after a few seconds of operation. If the oil level is normal, DO NOT restart the engine. Call your dealer for assistance.
Engine out of timeSee your dealer
Engine Temperature Below NormalThermostats not working properlyCheck thermostats

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

Parts

19
Part #DescriptionQtySystem
185046210Alternator Assembly1Alternator buy
22-48011Fuse for main circuitFuse buy
22-68312Fuse for main circuitFuse buy
408620002Air cleaner element1Air filter Amazon eBay $218.59
015140408Screw1Service part / kit buy
015140425Screw2Service part / kit buy
020210010Nut1Service part / kit buy
026100010Washer1Service part / kit buy
027100010Spring washer1Service part / kit buy
040126210Bearing2Service part / kit buy
185446217Plate, complete1Service part / kit buy
185446218Stator, complete1Service part / kit buy
185446219Flywheel, complete1Service part / kit buy
185446220Clamp1Service part / kit buy
185716200Plate1Service part / kit buy
199236510Collar1Service part / kit buy
22-68000New DST-61 regulator with fuse, fuse holder parts and two crimp lugs.Service part / kit buy
22-68035Both kits include M4x8 mm screws and lock washers to attach the adaptor mounting plate, 28-68003, into the tapped holes in the generator junction box. There are also M4 x 20 mm screws and lock washers to attach the DST-61 regulator to the adaptor mounting plate.Service part / kit buy
OM673IPService 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
50%1.40.4
100%2.40.6
Prime0.592.2
Prime15%1.1
Prime30%1.9
Prime40%1.1
Prime50%1.20.32
Prime80%1.9
Prime100%2.20.59
Standby0.51.9
Standby50%1.1
Standby100%1.9

Available documents

Spec sheetOperator's manualReferenceParts manual

Other sets with this engine