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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 Northern Lights L673L Engine engine. It is available at 120 V, 1-phase, 60 Hz and rated 25 A. It holds about 3.1 L (0.8 gal) of oil. The set measures 688×434×513.2 mm (27.1×17.1×20.2 in) and weighs about 165 kg (364 lb).

5 kW
Standby
0.76 L
Displacement
3.1 L
Oil capacity
4
Document types

Specifications

Fueldiesel
Frequency60.0 Hz
Standby power5 kW
Prime power4 kW
EmissionsTier III
ControllerDC Logic System
Oil capacity3.1 L
AlternatorTF-276KM / TF-276D
Voltage options120 V, 240 V
Phase1
Rated current25 A
Power factor1
Circuit breaker30 A
Dimensions (L×W×H)688×434×513 mm
Dry weight25 kg

Engine

Northern Lights L673L Engine
Displacement0.76 L
Aspirationnaturally aspirated
Rated speed1800 rpm

Maintenance & consumables

for the Northern Lights L673L Engine
ItemSpecCapacityPart #Interval
Air filterCleanable dry-type— find
Fuel filterlarge spin-on fuel filter— find
Oil filterspin-on oil filter with bypass—200 hr find
Belt— find
Oil3.1 qt—200 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 Northern Lights L673L Engine engine.

What fuel does the Northern Lights M673 use?

The Northern Lights M673 runs on diesel.

What alternator does the Northern Lights M673 use?

The Northern Lights M673 uses a TF-276KM / TF-276D alternator.

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

107
Part #DescriptionQtySystem
025100012Seal Washer (Industrial only)1Seal PartsGeek
052109076O-ring1Seal PartsGeek
052109078O-ring1Seal PartsGeek
052109113O-ring2Seal PartsGeek
06-78020Seal bar assembly1Seal PartsGeek
068115200Tube1Hose PartsGeek
110996760Gasket1Gasket PartsGeek
111147650Head Gasket, Thickness= 1.2 mm1Gasket PartsGeek
111147660Head Gasket, Thickness= 1.3 mm1Gasket PartsGeek
120406080Valve Guide Seal6Seal PartsGeek
140166130Rotor1Pump PartsGeek
140406570Suction Filter1Oil filter PartsGeek
140546020Filter Joint1Gasket PartsGeek
165996490Gasket1Gasket PartsGeek
18-72004Hose Assembly 1/2" x 13 1/2" (used with oil pan 110706770)1Hose PartsGeek
18-78009Hose Assembly 3/8" x 15" (used with oil pan 36-78006)1Hose PartsGeek
185046210Alternator Assembly1Alternator PartsGeek
198636080Oil Seal1Seal PartsGeek
22-48011Fuse for main circuitFuse PartsGeek
22-68312Fuse for main circuitFuse PartsGeek
22-95600S-1 Panel 12v/24vControl panel PartsGeek
22-95605S-1B Panel 12v/24vControl panel PartsGeek
22-98021Tough Series Controller 1ph Single Volt Off Unit M673LD3Controller PartsGeek
24-08001Oil Filter1Oil filter Amazon eBay $20.29 PartsGeek
40-02002Drive Belt1Belt Amazon eBay $46.28 PartsGeek
00-70083GROMMET, 1-1/8” ID x 1-7/8” OD PENETRATION PLATE2Service part / kit PartsGeek
040106203Bearing1Service part / kit PartsGeek
040109059Bearing1Service part / kit PartsGeek
040126210Bearing2Service part / kit PartsGeek
042303015Bearing1Service part / kit PartsGeek
05-70001CORNER CASTING4Service part / kit PartsGeek
05-72003BOLTING ASSEMBLY, LONG, STAINLESS STEEL8Service part / kit PartsGeek
05-75714BOLTING ASSEMBLY, SHORT, STAINLESS STEEL20Service part / kit PartsGeek
05-78014LEFT SIDE PANEL ASSEMBLY1Service part / kit PartsGeek
05-78017REAR PANEL ASSEMBLY1Service part / kit PartsGeek
05-78018FRONT PANEL ASSEMBLY1Service part / kit PartsGeek
05-78019RIGHT SIDE PANEL ASSEMBLY1Service part / kit PartsGeek
05-78021TOP PANEL ASSEMBLY1Service part / kit PartsGeek
05-78022PENETRATION PANEL ASSEMBLY1Service part / kit PartsGeek
05-78023EXTRUSION, VERTICAL4Service part / kit PartsGeek
05-78024EXTRUSION, HORIZONTAL, SIDES2Service part / kit PartsGeek
05-78026EXTRUSION, HORIZONTAL, ENDS2Service part / kit PartsGeek
05-78029JUNCTION BOX SUPPORT BRKT COVER ASSEMBLY1Service part / kit PartsGeek
06-78002Front panel assembly1Service part / kit PartsGeek
06-78003Rear panel assembly1Service part / kit PartsGeek
06-78006Top panel assembly1Service part / kit PartsGeek
06-78008Lower non-service side valence assembly1Service part / kit PartsGeek
06-78010Service side panel assembly1Service part / kit PartsGeek
06-78012Non-service side panel assembly1Service part / kit PartsGeek
06-78015Front lower valence assembly1Service part / kit PartsGeek
06-78018Rear lower valence assembly1Service part / kit PartsGeek
06-78029Junction box bridge cover assembly1Service part / kit PartsGeek
06-78030Lower service side valence assembly1Service part / kit PartsGeek
11-467Nylon bumper/rivet12Service part / kit PartsGeek
110136445Intake Valve Seat3Service part / kit PartsGeek
115017630Piston, standard (includes key #16)3Service part / kit PartsGeek
115104050Ring Kit, standard3Service part / kit PartsGeek
115326260Piston Pin3Service part / kit PartsGeek
12-00000#10-32 MACHINE SCREW x 1/2” LONG, STAINLESS STEEL8Service part / kit PartsGeek
12-00776M8 x 20 18-8, S/S hex head capscrew2Service part / kit PartsGeek
12-301111/4-20 x 3/4” hex head capscrew S/S3Service part / kit PartsGeek
12-70013M8 x 12 18-8, S/S button head screw2Service part / kit PartsGeek
120026810Camshaft Assembly (includes keys #2 - 6)1Service part / kit PartsGeek
120116100Tappet5Service part / kit PartsGeek
120116180Tappet (#1 Exhaust only)1Service part / kit PartsGeek
120166370Intake Valve3Service part / kit PartsGeek
120176290Exhaust Valve3Service part / kit PartsGeek
120186100Retainer6Service part / kit PartsGeek
120216130Valve Cap6Service part / kit PartsGeek
120226080Valve Keeper12Service part / kit PartsGeek
120456320Push Rod6Service part / kit PartsGeek
14-00032#10-32 NYLOCK HEX NUT, STAINLESS STEEL8Service part / kit PartsGeek
140036220Relief Valve Assembly1Service part / kit PartsGeek FridayParts $68.50
15-00705M8 lockwasher, S/S2Service part / kit PartsGeek
15-091031/4” external star washer, S/S3Service part / kit PartsGeek
15-11000M8 flatwasher, S/S2Service part / kit PartsGeek
15-70002#10 FLATWASHER, USS STAINLESS STEEL8Service part / kit PartsGeek
185446218Stator, complete1Service part / kit PartsGeek
198217070Spring6Service part / kit PartsGeek
198517103Bearing, Standard Upper1Service part / kit PartsGeek
198517107Bearing, undersize 0.25 mm (formerly #198517106)1Service part / kit PartsGeek
198517112Bearing, Standard Lower1Service part / kit PartsGeek
198517116Bearing, undersize 0.25 mm (formerly #198517115)1Service part / kit PartsGeek
198517119Bearing, undersize 0.50 mm (formerly #198517118)1Service part / kit PartsGeek
198517301Bushing, standard1Service part / kit PartsGeek
198517305Bushing, undersize 0.25 mm1Service part / kit PartsGeek
198517308Bushing, undersize 0.50 mm1Service part / kit PartsGeek
198517312Bearing, standard (formerly #198517311)6Service part / kit PartsGeek
198517316Bearing, undersize 0.25 mm (formerly #198517315)6Service part / kit PartsGeek
198517319Bearing, undersize 0.50 mm (formerly #198517318)6Service part / kit PartsGeek
198517325Bushing3Service part / kit PartsGeek
198517332Bearing, Standard Upper (formerly #198517331)2Service part / kit PartsGeek
198517336Bearing, undersize 0.25 mm (formerly #198517335)2Service part / kit PartsGeek
198517339Bearing, undersize 0.50 mm (formerly #198517338)2Service part / kit PartsGeek
198517342Bearing, Standard Lower (formerly #198517341)2Service part / kit PartsGeek
198517346Bearing, undersize 0.25 mm (formerly #198517345)2Service part / kit PartsGeek
198517349Bearing, undersize 0.50 mm (formerly #198517348)2Service part / kit PartsGeek
198517630Bearing, undersize 0.50 mm (formerly #198517109)1Service part / kit PartsGeek
199266180Thrust Washer1Service part / kit PartsGeek
22-68000New DST-61 regulator with fuse, fuse holder parts and two crimp lugs.Service part / kit PartsGeek
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 PartsGeek
22-72026Wire harness kit1Service part / kit PartsGeek
23-78003REAR PANEL RETAINING BRACKET2Service part / kit PartsGeek
23-78007TOE BRACKET4Service part / kit PartsGeek
23-78016PANEL RETAINER BLOCK, SINGLE NOSE, NYLON8Service part / kit PartsGeek
55-78066SOUND FOAM, PENETRATION PLATE OPTION2Service part / kit PartsGeek
55-78068PLUG, BASE PAN MOUNTING FOOT POCKET4Service 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
50%1.40.4
100%2.40.6
Prime2.2
Prime50%1.20.32
Prime100%2.20.59
Standby

Available documents

Spec sheet — M673 (Northern Lights)Spec sheet — M673D (Northern Lights)Spec sheet — M673L (Northern Lights)Spec sheet — s102 m673l3 spec sheets v1 (Northern Lights)Operator's manual — OM673 (Northern Lights)Reference — L116 1 4 warranty (Northern Lights)Reference — L631-Marine-Accessories (Northern Lights)Parts manual — P673-2-I (Northern Lights)Parts manual — P673-2 (Northern Lights)Parts manual — P673-I (Northern Lights)Parts manual — P673 (Northern Lights)Parts manual — P673L-I (Northern Lights)Parts manual — P673L (Northern Lights)Parts manual — filter chart guide (Northern Lights)

Other sets with this engine

Northern Lights M673LD3Northern Lights NL673L4