Northern Lights 753 — Specs, Engine, Parts & Maintenance

Service parts for the 753

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

Air intake

1 required

24-22003Air filtersee priceAmazon

Fuel system

1 required

130336020Fuel filter$24.71eBay

Oil system

1 required

140516190Oil filter$9.09NAPA

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

Specifications

Oil capacity	3.5 L
Alternator	PXK / PX-308K

Engine

Northern Lights 753K

Oil capacity	3.5 L

Maintenance & consumables

for the Northern Lights 753K

Item	Spec	Part #	Interval
Air filter	Air Cleaner Element (Marine)	24-22003		Amazon eBay
Fuel filter	Clean or replace filter element.	130336020	500 hr	Amazon eBay $24.71
Oil filter	Change the crankcase oil and filter.	140516190	100 hr	Amazon eBay $9.97 NAPA $9.09 KuduParts $19.00
Battery	Check electrolyte level daily. Add distilled water to manufacturer’s recommended level.	—	50 hr
Belt	Loosen the alternator belt.	—	100 hr
Coolant		—	50 hr
Coolant filter		—
Oil	Check oil level in engine	—	50 hr
Spark plug	Clean outside of unit. Paint any scratched or chipped surfaces. Put corrosion preventative on all exposed metal surfaces.	—	100 hr

Service intervals

Item	Action	Hours	Months	Notes
Battery electrolyte	Check	50 hr	1 mo	First service — Every 50 hours or once per month
Battery electrolyte level	Check	50 hr
Cylinder head bolts	Adjust	50 hr		First service — Retighten when cold
V-belt tension	Check	50 hr		First service — Every 50 hours
V-belts	Check	50 hr
Valve clearance	Adjust	50 hr		First service
Valve clearances	Adjust	50 hr		First service — SP6 - After first 50 hours
Valves	Adjust	50 hr		First service — After first 50 hours
Air cleaner	Inspect	100 hr		Replace as necessary
Battery cables and terminals	Clean	100 hr		Every 100 hours
Engine oil	Change	100 hr		First service — Service chart; after first 50 hours during break-in
Radiator fins	Clean	100 hr		Industrial; in dusty applications
Injection pump lubricating oil	Change	200 hr		Except LM 753
Lubricating oil filters	Change	200 hr		First service — Service chart; text also states every 100 hours; change after first 50 hours during break-in
Primary fuel filter element	Change	200 hr		Racor; every 200 hours
Zinc electrodes	Check	200 hr
Air cleaner	Check	250 hr		SP4 - Inspect every 250 hours; more often in dusty conditions
Batteries	Test	250 hr		SP19 - Check condition of batteries with hydrometer
Engine oil and filter	Change	250 hr		First service — SP2/3 - Every 250 hours; every 100 hours or six weeks in intermittent cold weather operation
Radiator fins (industrial)	Clean	250 hr		SP16 - Check and clean radiator; every 100 hours in very dusty applications
Exhaust elbow	Inspect	500 hr		SP20 - Inspect condition of exhaust elbow
Primary fuel filter element (Racor)	Change	500 hr		SP8 - Change element every 500 hours or as often as necessary
Secondary fuel filter	Change	600 hr		SP9 - Every 500 hours
Battery state of charge	Test	600 hr		Hydrometer check every 600 hours
Cooling system	Clean	600 hr	12 mo	Flush every 600 hours or 12 months
Cooling system	Other	600 hr	12 mo	Check and flush
Raw water pump impeller	Change	600 hr		Marine only; or as needed
Seawater pump impeller	Change	600 hr		Marine
Valve clearance	Check	600 hr
Air cleaner element	Replace	1000 hr		SP4 - Change element at 1000 hours
Injectors	Check	1000 hr		SP11 - Check by Northern Lights dealer or injection repair station
Raw water pump impeller (marine)	Replace	1000 hr		SP17 - Or as needed
Valve clearances	Check	1000 hr		SP6 - Every 1000 hours thereafter
Reverse gear oil	Change	1200 hr	12 mo	Whichever comes first
Fuel injection pump	Check	2500 hr		Settings, idle, maximum speed and exhaust smoke every 2400 hours
Heat exchanger	Clean	2400 hr	12 mo	Marine only; once a year or after 2400 hours
Reverse gear oil cooler	Clean	2400 hr	12 mo
Cooling system	Check	2500 hr	12 mo	SP14 - Check and flush cooling system every 2500 hours or every 12 months, whichever comes first
Heat exchanger (marine)	Clean	2500 hr	12 mo	SP15 - Once a year or after 2500 hours

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Coolant level	1 3/4	in	cold, below filler cap sealing surface; 4-5 cm as printed
Clearance	Cooling water level below filler cap sealing surface	about 1 (2.5 cm)	in.	engine cold
Gap	V-belt deflection	3/16	in	midpoint between crankshaft and alternator pulleys
Gap	V-belt deflection	3/4	in	midway; 17 mm as printed
Gap	V-belt deflection	5	mm	midpoint between crankshaft and alternator pulleys
Other	Battery hydrometer correction	0.004		per 10°F above or below 80°F (27°C)
Other	Battery specific gravity	1.260		fully charged, corrected
Other	Battery specific gravity charge threshold	1.215		charge if below
Other	Battery specific gravity cold	1.280		full charge reading
Other	Battery specific gravity tropical	1.225		full charge reading
Other	Bore	75	mm
Other	Compression ratio	23:1
Other	Displacement	0.95	l
Other	Maximum intermittent operating angle, industrial	0	°
Other	Maximum intermittent operating angle, marine	15	°
Other	Stroke	72	mm
Other	V-belt deflection at midpoint between crankshaft and alternator pulleys	3/16 (5 mm)	in.	thumb pressure
Pressure	Coolant filler cap	7	PSI	release pressure
Pressure	Coolant filler cap release	7	PSI	approximately
Pressure	Cooling system filler cap pressure valve release	7 (0.5 bar)	PSI
Pressure	Engine oil pressure	above 15	PSI	operating
Pressure	Engine oil pressure (running, Series 3/4 panels)	above 15	PSI	engine operating
Pressure	Engine oil pressure normal reading	20-60	PSI	after a few seconds of operation
Pressure	Maximum exhaust back pressure	48	in H2O
Pressure	Maximum fuel pump head suction	39	in	1.0 m
Pressure	Normal oil pressure reading after start	20-60	PSI	a few seconds of operation
Pressure	Oil pressure	above 30	PSI	after start
Pressure	Oil pressure minimum operating	above 15	PSI	operating
Pressure	Oil pressure normal	20 - 60	PSI	after a few seconds of operation
Pressure	Oil pressure shutdown threshold	below 15	PSI	speed higher than idling
Pressure	Radiator cap pressure	4	psi	pressure valve releases; 27 kPa as printed
Speed	Frequency 50 Hz	1500	rpm
Speed	Frequency 60 Hz	1800	rpm
Speed	Frequency meter indication	1200 or 1800 RPM (60 Hz), or 1500 RPM (50 Hz)	RPM
Speed	Generator frequency	60	Hz	1800 RPM or 1200 RPM
Speed	Low idle	650	RPM
Speed	Maximum engine speed when shifting	800	RPM	should not be exceeded
Speed	Normal engine working range	1800-2700	RPM	depending on engine
Temperature	Cooling water temperature	below 140	°F	investigate
Temperature	Cooling water temperature	over 200	°F	stop engine and investigate
Temperature	Cooling water temperature, industrial sets	below 225 (107)	deg F	normal operation; shut off immediately above 230 deg F (110 deg C)
Temperature	Cooling water temperature, marine sets	below 200 (94)	deg F	normal operation; shut off immediately above 205 deg F (96 deg C)
Temperature	Industrial water temperature normal	below 225	°F
Temperature	Industrial water temperature shutdown	above 230	°F
Temperature	Marine water temperature normal	below 200	°F
Temperature	Marine water temperature shutdown	above 205	°F
Temperature	Water temperature gauge	below 200	°F	operating
Temperature	Water temperature shutdown	above 205	°F	shut off immediately
Torque	Cylinder head bolts	33 - 36	ft/lbs	cold
Torque	Cylinder head bolts	33-36	ft/lbs	cold
Torque	Cylinder head bolts	4.5-5	kg/m	cold
Torque	Cylinder head bolts	60-64	ft/lbs	cold
Torque	Cylinder head bolts	9-9.5	kg/m	cold
Torque	Cylinder head bolts (753K)	33 - 36	ft/lbs	engine cold, tightened in 2 or 3 passes in the order shown
Torque	Cylinder head bolts (753K)	4.5 - 5	kg/m	engine cold
Torque	Cylinder head bolts (843, first nut group)	94-98	lb/ft	cold; nut range OCR-garbled; model 843
Torque	Cylinder head bolts 1-14 nuts	33-36	lb/ft	cold; model 753
Torque	Cylinder head bolts 1-18 nuts	94-98	ft/lb	cold; models 854A, 854B; unit copied as printed
Torque	Cylinder head bolts 1-6 nuts	94-98	lb/ft	cold; model 892
Torque	Cylinder head bolts 12-17 nuts	43-47	lb/ft	cold; model 843

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant	50% water / 50% ethylene glycol antifreeze			3.7 l	Marine sets
Coolant	50% water / 50% ethylene glycol antifreeze mix				Antifreeze mixture recommended as a good year-round coolant (marine and industrial)
Coolant	50% water/50% ethylene glycol antifreeze				Recommended as a good year-round coolant
Coolant	Ethylene glycol with inhibitors		above -25°C		Minimum 40% and maximum 60% glycol mixture provides protection down to about -13°F (-25°C)
Engine oil	RPM Delo series 100/30W or service CC 30/W				Break-in oil for first 100 hours; change at 50 and 100 hours
Engine oil	SAE 5W	API Service CC/CD/CE or CC/CD/SF	below -23°C		Below -10°F (-23°C); SAE 5-20W multi-viscosity alternative
Engine oil	SAE 5W (single viscosity) / SAE 5-20W (multi-viscosity)	API Service CC/CD/CE single viscosity or CC/CD/SF multi-viscosity	below -23°C		Below -10 deg F (-23 deg C); oil consumption may increase with SAE 5W and SAE 5-20W oils
Engine oil	SAE 5W (single viscosity) or SAE 5-20W (multi-viscosity)	API Service CC/CD/CE single; CC/CD/SF multi	below -23°C		Below -10°F (-23°C)
Engine oil	SAE 5W-20	API Service CC/SD or MIL-L-46152	below -23°C		Below -10°F (-23°C); some increase in oil consumption may be expected
Engine oil	Service CC 30 weight				Use during the first 100 hours; set is delivered with special break-in oil. Never use flushing oil or additives
Engine oil	SAE 10W	API Service CC/CD/CE or CC/CD/SF	-23°C to 0°C		-10 to 32°F (-23 to 0°C); SAE 10-30W multi-viscosity alternative
Engine oil	SAE 10W (single viscosity) / SAE 10-30W (multi-viscosity)	API Service CC/CD/CE single viscosity or CC/CD/SF multi-viscosity	-23°C to 0°C		Chart printed as -10 to 32 deg F (-23 to 0 deg C)
Engine oil	SAE 10W (single viscosity) or SAE 10-30W (multi-viscosity)	API Service CC/CD/CE single; CC/CD/SF multi	-23°C to 0°C		-10 to 32°F (-23 to 0°C)
Engine oil	SAE 10W-30	API Service CC/SD or MIL-L-46152	-23°C to 0°C		Multi-viscosity for 10°F-32°F (-23°C-0°C)
Engine oil	SAE 30W	API Service CC/CD/CE or CC/CD/SF	above 0°C		Above 32°F (0°C); SAE 15-40W multi-viscosity alternative
Engine oil	SAE 30W (single viscosity)	API Service CC/CD	above 0°C		Above 32°F (0°C); multi-viscosity: Don't Use
Engine oil	SAE 30W (single viscosity) / SAE 15-40W (multi-viscosity)	API Service CC/CD/CE single viscosity or CC/CD/SF multi-viscosity	above 0°C	3.5 L	Above 32 deg F (0 deg C). Capacity with new oil filter, 753K: 3.7 quarts (3.5 liters)
Engine oil	SAE 30W (single viscosity) or SAE 15-40W (multi-viscosity)	API Service CC/CD/CE single; CC/CD/SF multi	above 0°C		Above 32°F (0°C)
Fuel	Grade No. 1-D	ASTM D975	below 0°C		Use at ambient temperatures below freezing and for all temperatures at altitudes above 5,000 ft (1,500 m); cetane 45 minimum; sulfur less than 1.0%, preferably less than 0.5%
Fuel	Grade no. 1 diesel	ASTM D975	below 0°C		Below freezing and for all temperatures at altitudes above 5,500 ft (1500 m); do not use heating oils or Class B, D, E, F, G, H fuels or ASTM-D975-60T No. 4-D and higher
Fuel	No. 1 diesel	ASTM D975	below 0°C		Below freezing and all temperatures above 5,500 ft (1500 m)
Fuel	Grade No. 2-D	ASTM D975	above 0°C		Use at ambient temperatures above freezing
Fuel	Grade no. 2 diesel	ASTM D975; sulphur less than 1% (preferably less than 0.5%); cetane number minimum 45	above 0°C		Above freezing 32 deg F (0 deg C)
Fuel	No. 2 diesel	ASTM D975	above 0°C		Above freezing 32°F (0°C); sulfur less than 1%; cetane minimum 45
Gear oil	ATF lubricating oil or engine lubricating oil				Hurth and Borg Warner reverse gears. Capacities: Hurth 50 0.32 L, Hurth 100 0.37 L, Hurth 150 0.59 L, Borg Warner AS71 0.26 L

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Adjust Valve Clearances adjustment

Tools: feeler gauge, wrench

Adjust after head bolts are retightened; engine cold and not running.
Turn engine by hand until valves rock, then one more full turn.
Loosen lock nut and adjust clearance with adjustment screw.
Set intake and exhaust clearance to 0.008 in (0.2 mm).
Repeat for each cylinder; replace rocker arm cover.
Tighten cover nuts to 5-8 ft/lb (0.8-2.3 kg/m).

Adjust valve clearance adjustment

Tools: feeler gauge, wrench

Adjust after head bolts are retightened; engine cold and stopped.
Turn engine by hand until valves rock.
Turn crankshaft one more full turn.
Loosen locknut and adjust clearance.
Set both intake and exhaust to 0.008 in (0.2 mm).
Repeat for each cylinder individually.
Replace rocker arm cover; tighten nuts 5-8 ft/lbs.

Adjusting valve clearance adjustment

Do adjustment after cylinder head bolts are tightened and engine is stopped.
Turn engine by hand until inlet valve starts to open and exhaust valve starts to close.
Turn crankshaft one more turn and adjust clearance for this cylinder.
Loosen nut and adjust intake and exhaust valves with adjust screw.
Adjust each set of valves individually.
Replace rocker arm cover and tighten nuts evenly.

Retightening Cylinder Head Bolts adjustment

⚠ Tighten bolts when the engine is cold.

Tools: Torque wrench

Retighten head bolts after the first 50 hours with the engine cold.
Loosen the nuts and remove the rocker arm cover.
Tighten head bolts with a torque wrench in the order shown, evenly in 2 or 3 passes.
Finish at 33 - 36 ft/lbs (4.5 - 5 kg/m) on the final pass.
Replace the rocker arm cover and tighten cover nuts to 5 - 8 ft/lbs (0.8 - 2.3 kg/m).

Valve Clearance Adjustment (SP6) adjustment

Tools: Feeler gauge, Wrench

Adjust valve clearance after the first 50 hours and every 1000 hours thereafter, after head bolts are retightened.
Engine must be cold and NOT running.
Turn engine by hand until the inlet valve starts to open and exhaust valve starts to close (rocking).
Turn the crankshaft one more full turn and adjust both valves for this cylinder.
Loosen the lock nut and adjust clearance between rocker arm and valve guide with the adjustment screw.
Set both intake and exhaust to 0.008 in. (0.2 mm); repeat for each cylinder.
Replace the rocker arm cover and tighten cover nuts to 5 - 8 ft/lbs (0.8 - 2.3 kg/m).

Glow Plug Test diagnostic

Tools: D.C. test bulb

Loosen the current carrying flat wire between the plus-poles of the glow plugs.
Connect a D.C. test bulb between the plus-pole of the battery and the plus-pole of the glow plug.
If the bulb lights up, the glow plug is functioning properly.
Check all glow plugs and replace any faulty ones.

Glowplug check diagnostic

⚠ Do not hold pre-heat switch on over 30 seconds; glowplugs may burn out.

Tools: Test bulb

Loosen current-carrying flat wire between plug poles of glowplugs.
Connect a bulb between plus-pole of battery and plus-pole of glowplug.
If bulb lights up, glowplug is functioning.
Check all glowplugs and replace faulty ones.

Air Cleaner Service (SP4) maintenance

⚠ Do NOT run the engine with the air cleaner removed.

Inspect air cleaner every 250 hours; check more often in dusty conditions.
Marine sets: if dirty, wash element in soapy water, rinse and dry thoroughly before reinstalling; replace if necessary.
Industrial sets: element cannot be cleaned; replace it when necessary.
Make sure no impurities enter the engine while changing the element.

Air cleaner service maintenance

⚠ Make absolutely sure no impurities enter the engine.

Remove cleaner by unscrewing center cap screw.
Wipe inside of filter housing.
Discard old cleaner if necessary and replace with new.
New style: wash in cleaning solvent or soap and water.
Make sure screen is in place before reinserting.
Reinstall foam filter only when completely dry.

Battery Care (SP18-19) maintenance

⚠ Battery gas can explode; keep all flames and sparks away from batteries.

Tools: Hydrometer

Check electrolyte level daily and add distilled water to the manufacturer's recommended level.
Check and clean batteries, cables and terminals every 100 hours.
Clean corrosion with a water and baking soda solution, flush with clean water, tighten and grease terminals.
Check battery condition with a hydrometer every 250 hours.

Bleed fuel system maintenance

⚠ Fuel under pressure can penetrate skin.

Tools: wrench, cardboard

Loosen bleed bolt A on top of filter.
Pump hand primer B until pure fuel escapes.
Tighten bleed screw A.
Loosen bleed screw C; pump until pure fuel escapes.
Tighten bleed screw C.
If engine will not start, loosen one injector line.
Crank until pure fuel escapes; tighten line.
Repeat each line one at a time; check for leaks.

Bleeding the Fuel System (SP10) maintenance

⚠ Escaping diesel fuel under pressure can penetrate skin causing serious personal injury; relieve pressure before disconnecting lines.

⚠ Use cardboard or wood, not hands, to search for leaks.

Tools: Wrenches, Cardboard

Loosen bleed bolt A on top of the filter and pump hand primer B until pure fuel escapes; tighten A.
Loosen bleed screw C and pump hand primer B until pure fuel escapes; tighten C.
If engine does not start, loosen a fuel line at the injector and crank until pure fuel escapes; tighten.
Do each line one at a time.
After starting, use a piece of cardboard to check for fuel leaks.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

What engine does the Northern Lights 753 use?

The Northern Lights 753 is powered by the Northern Lights 753K engine.

What is the oil capacity of the Northern Lights 753?

The Northern Lights 753K engine in the Northern Lights 753 has an oil capacity of 3.5 liters.

What alternator comes on the Northern Lights 753?

The Northern Lights 753 uses a PXK / PX-308K alternator.

What oil filter does the Northern Lights 753 use?

The Northern Lights 753 uses oil filter part number 140516190.

Which fuel filter part number does the Northern Lights 753 take?

The Northern Lights 753 uses fuel filter part number 130336020.

Which air filter part number does the Northern Lights 753 take?

The Northern Lights 753 uses air filter part number 24-22003.

Troubleshooting

Symptoms & remedies

Symptom	Cause	Remedy
Battery Will Not Charge	Loose or corroded connections	Clean and tighten battery connections.
Battery Will Not Charge	Sulfated or worn out batteries	Check specific gravity of each battery; Check electrolyte level of each battery.
Battery Will Not Charge	Loose or defective alternator belt	Adjust belt tension; Replace belt.
Starter Inoperative	Check DC circuit breaker	If the breaker is tripped, reset it.
Starter Inoperative	Loose or corroded connections	Clean and tighten loose battery and harness plug connection.
Starter Inoperative	Low battery output	Check specific gravity of each battery; Check electrolyte level of each battery.
Starter Inoperative	Defective electrical system ground wire	Repair or replace.
Starter Cranks Slowly	Low battery output	Battery is too small; Battery cables are too small.
Starter Cranks Slowly	Check specific gravity of each battery	Replace battery if necessary.
Starter Cranks Slowly	Check electrolyte level of each battery	If low, fill cells with distilled water.
Starter Cranks Slowly	Crankcase oil too heavy	Fill with oil of appropriate viscosity.
Starter Cranks Slowly	Loose or corroded connections	Clean and tighten loose connections.
Entire Electrical System Does Not Function	Check DC circuit breaker	If breaker is tripped, reset it.
Entire Electrical System Does Not Function	Faulty connection	Clean and tighten battery and harness plug connections.
Entire Electrical System Does Not Function	Sulfated or worn out batteries	Check specific gravity and electrolyte level of each battery.
Engine Hard to Start or Will Not Start	Improper starting procedure	See starting section of this manual. Take special note of Bypass Switch operation.
Engine Hard to Start or Will Not Start	No fuel	Check level of fuel in fuel tank.
Engine Hard to Start or Will Not Start	Low battery output	Check electrolyte level and condition.
Engine Hard to Start or Will Not Start	Excessive resistance in starting circuit	Clean and tighten all battery connections.
Engine Hard to Start or Will Not Start	Crankcase oil too heavy	Use oil of proper viscosity.
Engine Hard to Start or Will Not Start	Improper type of fuel	Consult fuel supplier and use proper type of fuel for operating condition.
Engine Hard to Start or Will Not Start	Water, dirt or air in fuel system	Drain, flush, fill and bleed system.
Engine Hard to Start or Will Not Start	Clogged primary fuel filter element	Clean or replace filter element.
Engine Hard to Start or Will Not Start	Clogged secondary fuel filter element	Replace filter element.
Engine Hard to Start or Will Not Start	Dirty or faulty injection nozzles	Have your dealer check injection nozzles.
Engine Runs Irregularly or Stalls Frequently	Below normal engine temperature	Remove and check thermostat.
Engine Runs Irregularly or Stalls Frequently	Clogged primary fuel filter element	Clean or replace filter element.
Engine Runs Irregularly or Stalls Frequently	Clogged secondary fuel filter element	Replace secondary filter element.
Engine Runs Irregularly or Stalls Frequently	Water or dirt in the fuel system	Drain, flush, fill and bleed system.
Engine Runs Irregularly or Stalls Frequently	Dirty or faulty injection nozzles	Have your dealer check injection nozzles.
Engine Runs Irregularly or Stalls Frequently	Air in fuel system	Inspect clamps and hoses on suction side of fuel pump for air leak.
Engine Runs Irregularly or Stalls Frequently	Improper type of fuel	Consult fuel supplier and use proper type of fuel for operating condition.
Lack of Engine Power	Intake air restriction	Service air cleaner.
Lack of Engine Power	Clogged primary fuel filter element	Clean or replace filter element.
Lack of Engine Power	Clogged secondary fuel filter element	Replace filter element.
Lack of Engine Power	Improper type of fuel	Consult fuel supplier and use proper type of fuel for operating conditions.
Lack of Engine Power	Overheated engine	See "Engine Overheats" in next category.
Lack of Engine Power	Below normal engine temperature	Remove and check thermostat.
Lack of Engine Power	Improper valve clearance	Reset valves. Best done by dealer.
Lack of Engine Power	Dirty or faulty injection nozzles	Replace injectors. Best done by dealer; See your local dealer.
Engine Overheats	Low coolant level	Fill tank or radiator to proper level; Check hoses for loose connections and leaks.
Engine Overheats	Keel cooling tubes have been painted (marine)	Remove paint from tubes.
Engine Overheats	Cooling system needs flushing	Flush cooling system.
Engine Overheats	Defective thermostat	Remove and check thermostat.
Engine Overheats	Defective temperature gauge	Check water temperature with thermometer and replace gauge if necessary.
Engine Overheats	Water pump impeller worn/broken	Check impeller and replace if necessary.
Engine Knocks	Insufficient oil	Call your dealer.
Engine Knocks	Injection pump out of time	Call your dealer.
Engine Knocks	Below normal engine temperature	Check your thermostats; Check water temperature to see if temperature gauge is working properly.
Engine Knocks	Engine overheating	See "Engine Overheating" section.
High Fuel Consumption	Improper type of fuel	Use correct fuel for temperature.
High Fuel Consumption	Clogged or dirty air cleaner	Service air cleaner.
High Fuel Consumption	Improper valve clearance	See your dealer.
High Fuel Consumption	Injection nozzles dirty	See your dealer.
High Fuel Consumption	Injection pump out of time	See your dealer.
High Fuel Consumption	Engine not at proper temperature	Check your thermostats; Check water temperature with thermometer and replace gauge if necessary.
Below Normal Engine Temperature	Thermostats not working properly	Check thermostats.
Below Normal Engine Temperature	Temperature gauge not working properly	Check water temperature with thermometer.
Low Oil Pressure	Low oil level	Fill crankcase to proper level.
Low Oil Pressure	Improper type of oil	Drain and fill crankcase with correct oil.
Low Oil Pressure	Partially plugged oil filter	Replace filter.
High Oil Consumption	Break-in period	Oil consumption decreases after break in.
High Oil Consumption	Crankcase oil too light	Use proper viscosity oil.
High Oil Consumption	Oil leaks	Check for leaks in lines around gaskets and drain plug.
Engine Emits Black or Gray Exhaust Smoke	Clogged or dirty air cleaner	Service air cleaner.
Engine Emits Black or Gray Exhaust Smoke	Defective muffler (back pressure too high)	Have dealer check back pressure.
Engine Emits Black or Gray Exhaust Smoke	Improper fuel	Use correct fuel for temperature.
Engine Emits Black or Gray Exhaust Smoke	Injection nozzles dirty	See your dealer.
Engine Emits Black or Gray Exhaust Smoke	Engine timing off	See your dealer.
Engine Emits White Smoke	Improper fuel	Use correct fuel for temperature.
Engine Emits White Smoke	Cold engine	Warm up engine to normal operating temperature.

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

Repair guides

Step-by-step procedures compiled from the Northern Lights service manual for this model.

Parts

Part #	Description	Qty	System
130336020	Secondary fuel filter	1	Fuel filter	Amazon eBay $24.71
140516190	Lube oil filter	1	Oil filter	Amazon eBay $9.97 NAPA $9.09 KuduParts $19.00
24-22003	Air filter	1	Air filter	Amazon eBay
314531123	Air Cleaner Element (Industrial)	1	Air filter	Amazon eBay $25.00
O753K	Battery connections.	1	Battery	Amazon eBay
753-012	Exhaust valve clearance adjustment screw	1	Service 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

Rating	Load	L/h	gal/h
Continuous	100%	3.5	0.94

Available documents

Operator's manual — O201 (Northern Lights)Operator's manual — O202 (Northern Lights)Operator's manual — O753G (Northern Lights)Operator's manual — O753K (Northern Lights)

This page was generated from the 4 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Northern Lights 753 Generator Set

Service parts for the 753

Air intake

Fuel system

Oil system

Specifications

Engine

Maintenance & consumables

Service intervals

Service specifications

Recommended fluids

Procedures

Common questions

Troubleshooting

Symptoms & remedies

Repair guides

Parts

Fuel consumption

Available documents