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Home›Northern Lights›Northern Lights M668

Northern Lights M668 Generator Set

The Northern Lights M668 is a 99 kW Diesel standby generator set. It is available at 120 V and 240 V, single-phase, 60 Hz and rated 100 A. It holds about 10 L (2.6 gal) of oil and 10 L (2.6 gal) of coolant, with a maximum ambient rating of 40 °C. Starting uses 1 group-Not specified battery at 12 V. The set measures 1500×800×700 mm (59.1×31.5×27.6 in), weighs about 200 kg (441 lb) and produces 75 dBA at 7 m. An integrated tank holds 200 L (52.8 gal), roughly 8 hours of runtime.

99 kW
Standby
10.0 L
Oil capacity
2
Document types

How to read your Northern Lights serial & model number →

Typical fuel consumption for 95–100 kW Diesel generators →

Compare with other 95–100 kW Diesel generators →

On this pageService partsSpecsMaintenanceFuel consumptionDocumentsFAQ

Service parts for the M668

Grouped by system, with how many of each the parts manual calls for.

Belts

1 required
AR54592Beltsee priceAmazon

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power99 kW
Prime power99 kW
EmissionsNot specified
ControllerNot specified
Oil capacity10.0 L
Alternator4045 (4-pole, Class H insulation)
Voltage options120 V, 240 V
PhaseSingle
Rated current100 A
Power factor0.8
Circuit breaker150 A
Battery groupNot specified
Battery voltage12 V
Battery quantity1
Coolant capacity10 L
Max ambient40 °C
Dimensions (L×W×H)1500×800×700 mm
Dry weight200 kg
Sound level75.0 dBA @ 7 m
Fuel tank200.0 L
Tank runtime8 hr

Maintenance & consumables

ItemSpecCapacityPart #Interval
BeltDrive Belt 1800 - 1800 RPM only (12 Volt 130-AMP)AR54592 Amazon eBay

Common questions

How many kW is the Northern Lights M668?

The Northern Lights M668 is rated 99 kW standby.

What fuel does the Northern Lights M668 use?

The Northern Lights M668 runs on Diesel.

What alternator does the Northern Lights M668 use?

The Northern Lights M668 uses a 4045 alternator. It has 4 poles. Insulation class H.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
Battery will not chargeLoose or corroded connections: * Clean and tighten battery connections. Sulfated or worn out batteries: e Check specific gravity of each battery. ° Check electrolyte level of each battery.Loose or corroded connections: * Clean and tighten battery connections. Sulfated or worn out batteries: e Check specific gravity of each battery. ° Check electrolyte level of each battery.
Starter inoperativeLoose or corroded connections: * Clean and tighten loose battery and harness plug connection.Low battery output: ¢ Check specific gravity of each battery. Check electrolyte level of each battery. Defective electrical system ground wire: * Repair or replace.
Starter cranks slowlyLow battery output: Batteries too small. * Battery cables too smail. Check specific gravity of each battery. Check electrolyte level of each battery. Crankcase oil too heavy. Loose or corroded connections: ¢ Clean and tighten loose connections.
Entire electrical system does not functionCheck DC circuit breaker. Faulty connection: « Clean and tighten battery and harness plug connections. Sulfated or worm out batteries: * Check specific gravity and electrolyte level of each battery.
Engine hard to start or will not startImproper starting procedure. No fuel. Low battery output: e Check electrolyte level and specific gravity of battery. Excessive resistance in starting circuit: c Clean and tighten all connections on batteries.
Engine runs irregularly or stalls frequentlyBelow normal engine temperature: e Remove and check thermostat. Clogged primary fuel filter element: c Clean or replace filter element. Clogged secondary fuel filter element: e Replace secondary filter element. Water or dirt in the fuel system. Dirty or faulty injection nozzles: c Have your dealer check injection nozzles.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Northern Lights M668 troubleshooting guide (11 entries) →

Parts

185
Part #DescriptionQtySystem
11-10015Thermostat Seal Ring1Thermostat seal ring Amazon eBay
11-11013Gasket1Gasket Amazon eBay $17.95
11-11023Manifold to Expansion Tank Gasket1Gasket Amazon eBay $17.95
11-11043Gasket1Gasket Amazon eBay $6.95
11-11611Gasket1Gasket Amazon eBay
11-21011Gasket, Intake Port1Gasket Amazon eBay
11-22599Gasket2Gasket Amazon eBay
11-30013Gasket1Gasket Amazon eBay
11-31011Gasket6Gasket Amazon eBay $49.95
11-31012Gasket1Gasket Amazon eBay
11-31031Gasket1Gasket Amazon eBay
11-31034Gasket1Gasket Amazon eBay
11-31094Gasket1Gasket Amazon eBay
11-31096Gasket1Gasket Amazon eBay
11-31098Gasket1Gasket Amazon eBay
11-31099Gasket1Gasket Amazon eBay
11-31401Gasket1Gasket Amazon eBay
11-31615Gasket1Gasket Amazon eBay
11-31635Gasket1Gasket Amazon eBay
16-01000O-Ring1Seal Amazon eBay
18-00011Hose 3/4"ID x 4" (L-M668D&Q)1Hose Amazon eBay
18-00130Hose 1/4" x 30" (low fill)1Hose Amazon eBay
18-00753Hose 3/4"ID x 2-1/4"2Hose Amazon eBay
18-11003Hose 1-1/4"ID x 2-1/2"1Hose Amazon eBay
18-11010Hose 3/4" ID x 4-1/4"1Hose Amazon eBay
18-11011Hose 3/4" ID x 4-1/4" Silicon1Hose Amazon eBay
18-11012Hose 3/4"ID x 4-3/4"1Hose Amazon eBay
18-11025Hose1Hose Amazon eBay
18-11603Hose, Lower2Hose Amazon eBay
18-11604Hose 1-1/8 x 23"1Hose Amazon eBay
18-11606Hose1Hose Amazon eBay
18-11607Hose 1-1/8 x 2-1/2"1Hose Amazon eBay
18-11904Hose 3/4" Pre-formed1Hose Amazon eBay
18-11907Hose 1-1/4" ID x 15"1Hose Amazon eBay
18-12102Overflow Hose 3/8" x 30"1Hose Amazon eBay
18-12501Hose 3/4"ID x 3"1Hose Amazon eBay
18-21003Hump Hose (w/vent hole)**Hose Amazon eBay
18-21004Hump Hose1Hose Amazon eBay
18-21005Hose 2-1/4"ID x 1-1/2"1Hose Amazon eBay
18-21014Hose, 2" I.D. x 2-3/8"1Hose Amazon eBay
18-21020Hump Hose (w/o vent hole - C-Series)1Hose Amazon eBay
18-21027Hump Hose (w/o vent hole)**Hose Amazon eBay
18-31605Hose, 1-1/4 x 32" Wire Reinforced1Hose Amazon eBay
18-50001Hose Assembly 1/4"ID x 42" (Hydrolastic Mounts)1Hose Amazon eBay
18-51001Hose 1/4"ID x 36" (Standard Mounts - Marine & Industrial Gen Sets)1Hose Amazon eBay
18-51006Hose 1/4"ID x 39-1/2" (Hydrolastic Mounts - Marine Gen Sets)1Hose Amazon eBay
18-51009Hose Assembly 1/4"ID x 35" (Standard Moounts)1Hose Amazon eBay
18-51614Hose 3/8"ID x 16" (Standard Mounts - Marine & Industrial Gen Sets)1Hose Amazon eBay
18-54803Hose 3/8"ID x 21" (Hydrolastic Mounts - Marine Gen Sets)1Hose Amazon eBay
18-54805Hose Assembly 3/8"ID x 21" (Hydrolastic Mounts)1Hose Amazon eBay
18-71031Hose 3/8" ID x 14"1Hose Amazon eBay
18-71035Hose 1/2"ID x 11"1Hose Amazon eBay
18-72201Hose Assembly 3/8"ID x 16" (Standard Mounts)1Hose Amazon eBay
18-72509Hose 3/4"ID x 9-1/2" (L-M668T&A)1Hose Amazon eBay
20-12522Gasket2Gasket Amazon eBay
22-40915Pressure Switch, 15 PSI, 1/8 NPT1Sensor Amazon eBay
22-40925Temperature Switch 215°F1Sensor Amazon eBay
22-41016Pressure Sender, 0-80 PSI, 1/8 NPT1Sensor Amazon eBay
22-41025Switch, Water Temperature1Sensor Amazon eBay
22-41026Temperature Sender, 250°F, 1/2 NPT1Sensor Amazon eBay
22-42802Sender, Water Temperature1Sensor Amazon eBay
22-42803Sender, Oil Pressure1Sensor Amazon eBay
22-42805Switch, Oil Pressure1Sensor Amazon eBay
22-44812Sender, Tachometer1Sensor Amazon eBay
24-00000Oil Filter2Oil filter Amazon eBay $14.95
24-20001Air filter element (M16C, M20CL)1Air filter Amazon $184.36 eBay
24-21000Air Filter1Air filter Amazon eBay
24-51005Fuel Filter with Metal Drain Valve1Fuel filter Amazon eBay $24.99 KuduParts $18.00
24-52259Fuel Filter1Fuel filter Amazon eBay $15.00
25-11011Impeller1Impeller Amazon eBay $39.99
25-11017Gasket1Gasket Amazon eBay
25-11023Seal2Seal Amazon eBay
25-11024O-Ring1Seal Amazon eBay
25-11030Raw Water Pump (see parts detail)1Pump Amazon eBay
25-11031Impeller1Impeller Amazon eBay $30.23
25-11032Gasket1Gasket Amazon eBay
25-11033Seal1Seal Amazon eBay
25-11624Raw Water Pump (see parts detail)1Pump Amazon eBay
26-51627Fuel Injection Pump (L668A 2500RPM)1Pump Amazon eBay
26-51628Fuel Injection Pump (M668A - former #26-51626)1Pump Amazon eBay
26-51629Fuel Injection Pump (M-NL668T & C-Series - former #26-51613)1Pump Amazon eBay
26-51630Fuel Injection Pump (M-NL668D & C-Series - former #26-51612)1Pump Amazon eBay
26-51631Fuel Injection Pump (M668QT - former #26-51609)1Pump Amazon eBay
26-51632Fuel Injection Pump (M668Q - former #26-51619)1Pump Amazon eBay
29-01600Gasket Kit for Engine Overhaul (without Turbocharger)1Gasket Amazon eBay
29-01605Gasket Kit for Engine Overhaul (with Turbocharger)1Gasket Amazon eBay
29-01616Gasket Kit for Engine Overhaul (with Turbocharger/Aftercooler)1Gasket Amazon eBay
30-14828O-Ring1Seal Amazon eBay
30-31447O-Ring1Seal Amazon eBay
30-31644O-Ring1Seal Amazon eBay
30-31661O-Ring1Seal Amazon eBay
35-11000Thermostat1Thermostat Amazon eBay
36-71000Oil Drain Pump Kit (includes all Keys)1Pump Amazon eBay
36-71001Hand Pump1Pump Amazon eBay
A4830RO-Ring1Seal Amazon eBay
AR101549Seal Kit1Seal Amazon eBay
AR48675Thermostat 180°F1Thermostat Amazon eBay FridayParts $14.99
AR54592Drive Belt 1800 - 1800 RPM only (12 Volt 130-AMP)1Belt Amazon eBay
AR59578Air Cleaner (includes Figs 13-20)1Air filter Amazon eBay
AR65507O-Ring Seal Kit6Seal Amazon eBay FridayParts $27.20
AR67942Seal1Seal Amazon eBay FridayParts $15.25
AR77142Circulating Pump Assembly (includes Keys 2-11 & 14)1Pump Amazon eBay
AR79463Oil Pump Assembly (includes Keys 1-7, 13 & 17)1Pump Amazon eBay
AT24833Belt Set 1200 RPM1Belt Amazon eBay
AT31227Filter Element1Air filter Amazon eBay FridayParts $29.99
AT35155Filter Element1Air filter Amazon eBay FridayParts $88.98
AT43866Hose1Hose Amazon eBay
H35244O-Ring1Seal Amazon eBay
R10093O-Ring1Seal Amazon eBay
R105346Gasket, Turbocharger Oil Outlet1Gasket Amazon eBay
R113562O-Ring1Seal Amazon eBay
R113565Packing1Seal Amazon eBay $9.49
R119269Gasket2Gasket Amazon eBay
R26286O-Ring1Seal Amazon eBay
R26905Hose1Hose Amazon eBay
R27149O-ring1Seal Amazon eBay
R47154O-Ring1Seal Amazon eBay
R48000Seal1Seal Amazon eBay FridayParts $9.68
R495RO-Ring1Seal Amazon eBay
R51936Tube Seal9Seal Amazon eBay $29.99 FridayParts $17.68
R52811O-Ring2Seal Amazon eBay
R53550Hose, Lower1Hose Amazon eBay
R54534Hose, Upper1Hose Amazon eBay
R54638Gasket1Gasket Amazon eBay
R54641Gasket, Thermostat Housing1Gasket Amazon eBay
R54826Hose1Hose Amazon eBay
R54829Hose1Hose Amazon eBay
R56192O-Ring1Seal Amazon eBay
R56193O-Ring1Seal Amazon eBay
R56461O-Ring1Seal Amazon eBay
R56463O-Ring, Vent Tube1Seal Amazon eBay
R56551Hose1Hose Amazon eBay
R56809Gasket1Gasket Amazon eBay
R56812Impeller1Impeller Amazon eBay
R56814O-Ring (inner)1Seal Amazon eBay
R56815O-Ring (outer)1Seal Amazon eBay
R56905O-Ring1Seal Amazon eBay
R61871O-Ring1Seal Amazon eBay
R75728Gasket1Gasket Amazon eBay
R80632O-Ring**Seal Amazon eBay
R80648Gasket1Gasket Amazon eBay
R81275Gasket, Air Inlet1Gasket Amazon eBay
R87259Gasket (includes Key 6)1Gasket Amazon eBay
R87627O-Ring, Valve Stem12Seal Amazon eBay
R89879Gasket1Gasket Amazon eBay
R89944O-Ring**Seal Amazon eBay
R90648Gasket, Cylinder Block Plate1Gasket Amazon eBay
R90658Gasket, Exhaust Manifold6Gasket Amazon eBay
R92352Packing1Seal Amazon eBay
R92426Gasket1Gasket Amazon eBay FridayParts $79.80
R97185O-Ring (use with Cylinder Block marked R112871)1Seal Amazon eBay
R97344Gasket1Gasket Amazon eBay
R97348Gasket, Turbocharger Oil Inlet1Gasket Amazon eBay
R97350Gasket1Gasket Amazon eBay FridayParts $36.00
R97351Gasket, Flywheel Housing1Gasket Amazon eBay
R97352Gasket, Oil Filler Inlet Cover1Gasket Amazon eBay
R97773Gasket1Gasket Amazon eBay
R98471Gasket1Gasket Amazon eBay
R98484Gasket, Oil Cooler1Gasket Amazon eBay
R98485Gasket1Gasket Amazon eBay
R98486Gasket2Gasket Amazon eBay
R98487Gasket1Gasket Amazon eBay
R98488Gasket1Gasket Amazon eBay
R98489Gasket1Gasket Amazon eBay
RE31617Seal12Seal Amazon eBay FridayParts $29.10
RE32011Injector Packing Kit6Seal Amazon eBay
RE38087Fuel Injector (includes Keys 6-7)1Injector Amazon eBay FridayParts $74.29
RE38555Gasket (John Deere components)1Gasket Amazon eBay
RE38852Gasket Set1Gasket Amazon eBay
RE42211Fuel Transfer Pump (former # RE277667)1Pump Amazon eBay FridayParts $36.00
RE42695Fuel Injection Pump (L668D 2200RPM)1Pump Amazon eBay
RE44574Seal, Rear Oil1Seal Amazon eBay $39.63
RE45420Hose Assembly, Turbo Oil Supply1Hose Amazon eBay
RE47182Fuel Injection Pump (L668D 2500RPM - former #RE42092)1Pump Amazon eBay
RE47184Fuel Injection Pump (L668T 2200RPM - former #RE42094)1Pump Amazon eBay
RE50752Seal Kit (includes keys # 4,5,8 & 13)1Seal Amazon eBay
RE51551Belt Set 1800 RPM & Variable Speed1Belt Amazon eBay $87.53
T20243Gasket1Gasket Amazon eBay
T20273Gasket, Timing Gear Cover Opening1Gasket Amazon eBay
T20328Gasket1Gasket Amazon eBay
U13639O-ring2Engine Amazon eBay
21-10010Zinc Anode1Service part / kit Amazon eBay
R111135Valve, Oil Bypass1Service part / kit Amazon eBay
R73189Valve, Oil Bypass1Service part / kit Amazon eBay
R83169Valve1Service part / kit Amazon eBay

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
Prime50%12.04.3
Prime75%18.06.6
Prime100%24.08.5
Standby50%10.03.5
Standby75%15.05.3
Standby100%20.07.1

Available documents

Owner's manual — O300 (Northern Lights)Parts manual — P668-1 (Northern Lights)