Specifications
| Prime power | 78 kW |
|---|---|
| Oil capacity | 19.0 L |
| Battery cranking | 800 CCA |
| Battery voltage | 12 V |
| Dry weight | 522 kg |
Filters & service parts
model family| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Inspect air cleaner every 100 hours. Replace filter every 600 hours, or yearly, whichever comes first. | — | 600 hr | ||
| Fuel filter | Check primary fuel filter, Change primary and secondary fuel filter elements | — | 7 hr | ||
| Oil filter | Change the lube oil filter every 200 hours. Use a filter wrench to remove old filter. Dispose of filter in approved manner. Make sure the gasket from the old filter is removed and discarded. Lubricate the rubber gasket on the new filter and screw it on nipple until gasket meet the sealing surface. Using hands only, no wrench, tighten filter one-half turn farther. Overtightening can do damage to filter housing. Fill engine with recommended oil. Start engine and check for leakage. Stop engine and check oil level. Add additional oil if necessary. | — | 200 hr | ||
| Battery | Check electrolyte in batteries, Change impeller in raw water pump, Check the state of the charge of the batteries | — | 6 hr | ||
| Belt | Check V-belt condition, Check belt condition | — | 5 hr | ||
| Coolant | Check cooling water level, Check and flush cooling system, Check and clean heat exchanger, Check and clean gear oil cooler | — | 14 hr | ||
| Oil | Check engine oil level in the crankcase, with the oil dipstick, daily. | — | 50 hr | ||
| Spark plug | Adjust valves, Replace air cleaner | — | 600 hr |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.
Common questions
What engine is in the Northern Lights LP668D?
The Northern Lights LP668D is powered by the John Deere PowerTech 6068 engine.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine failures | Failures often occur in remote areas far from competent assistance. | |
| Battery charging regulator could be ruined | Switch is turned OFF while the engine is running | |
| Engine fails to start on first attempt | Do not crank the starter for more than 15 seconds consecutively. Ensure the starter has stopped completely before re-engaging. | |
| Engine temperature rises over 200°F (94°C) | Shut down the engine and investigate the cause of overheating. | |
| Shutdown is activated and temperature gauge shows within normal range | Check 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 after a few seconds of operation. If the oil level is normal, DO NOT restart the engine. Call your Northern Lights or Lugger dealer for assistance. | |
| Engine temperature rises above 205°F (97°C) | Shut off the engine immediately. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
41| Part # | Description | Qty | System | |
|---|---|---|---|---|
| B5009 | Engine Coolant Level Alarm Switch | Sensor | Amazon eBay | |
| B5010 | Engine Coolant Level Information Switch | Sensor | Amazon eBay | |
| B5101 | Engine Oil Pressure Sensor | Sensor | Amazon eBay | |
| B5102 | Exhaust Manifold Pressure Sensor | Sensor | Amazon eBay | |
| B5103 | EGR Flow Sensor | Sensor | Amazon eBay | |
| B5104 | Manifold Air Pressure Sensor | Sensor | Amazon eBay | |
| B5105 | Crankcase Pressure Sensor | Sensor | Amazon eBay | |
| B5107 | Low Pressure Fuel Pressure Sensor | Sensor | Amazon eBay | |
| B5108 | Engine Coolant Pressure Sensor | Sensor | Amazon eBay | |
| B5113 | Fuel Rail Pressure Sensor | Sensor | Amazon eBay | |
| B5200 | Fixed Turbocharger Compressor Outlet Temperature Sensor | Sensor | Amazon $249.00 eBay $19.49 FridayParts $9.50 | |
| B5205 | Charge Air Cooler Outlet Temperature Sensor | Sensor | Amazon eBay | |
| B5206 | Manifold Air Temperature Sensor | Sensor | Amazon eBay | |
| B5207 | EGR Temperature Sensor | Sensor | Amazon $24.37 eBay $65.09 | |
| B5208 | Engine Coolant Temperature Sensor | Sensor | Amazon eBay | |
| B5209 | Fuel Temperature Sensor | Sensor | Amazon eBay | |
| B5300 | VGT Speed Sensor | Sensor | Amazon eBay | |
| B5301 | Crankshaft Position Sensor | Sensor | Amazon eBay | |
| B5302 | Camshaft Position Sensor | Sensor | Amazon eBay | |
| B5500 | Intake Air Sensor | Sensor | Amazon eBay | |
| B5600 | Water-In-Fuel Sensor | Sensor | Amazon eBay | |
| Y5004 | Low-Pressure Fuel Pump | Pump | Amazon eBay | |
| Y5020 | DEF Dosing Injector | Injector | Amazon eBay | |
| Y5021 | Fuel Injector Harness | Injector | Amazon eBay $6.99 | |
| Y5501 | Low-Pressure Fuel Pump | Pump | Amazon eBay | |
| A5507 | DEF Tank Header Assembly Connector | Service part / kit | Amazon $54.99 eBay | |
| B5204 | SCR Temperature Module | Service part / kit | Amazon eBay | |
| B5212 | Temperature Module | Service part / kit | Amazon eBay | |
| F5000 | Fuse | Service part / kit | Amazon $2599.88 eBay | |
| K5803 | Cold Start Aid Relay | 1 | Service part / kit | Amazon eBay |
| X5007 | Remote switch jumper | Service part / kit | Amazon eBay | |
| X5401 | Air throttle connector | Service part / kit | Amazon $16.67 eBay | |
| Y5014 | Fan Solenoid - Increase | Service part / kit | Amazon $13.15 eBay $41.99 | |
| Y5015 | Fan Solenoid - Decrease | Service part / kit | Amazon eBay | |
| Y5018 | Ether Control Solenoid | Service part / kit | Amazon eBay | |
| Y5022 | Pressure Control Valve 1 (PCV) | Service part / kit | Amazon eBay | |
| Y5023 | Pressure Control Valve (PCV) 2 | Service part / kit | Amazon eBay | |
| Y5024 | Pressure Relief Valve | Service part / kit | Amazon eBay | |
| Y5400 | EGR Valve | Service part / kit | Amazon eBay | |
| Y5401 | Air Throttle Actuator | Service part / kit | Amazon eBay | |
| Y5500 | VGT Actuator | 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.
Available documents
Spec sheet — LP668D (Northern Lights)Operator's manual — OLP (Northern Lights)Parts manual — P668PT (Northern Lights)