Oil too low
8 brands- Continental: Add oil.
- Cummins/Onan: Add oil; Add oil.
- Doosan: Add oil
- Ernest: Add oil
- Garretson: Add oil.
- Guan: Add oil
- NEC: Add oil.
- generatorpartspro: Add oil
Oil relief valve not seating
8 brands- Continental: Remove and clean, or replace.
- Cummins/Onan: Clean by-pass. Replace if needed; Clean by-pass. Replace if needed.
- Doosan: Remove and clean, or replace
- Ernest: Remove and clean, or replace
- Garretson: Remove and clean, or replace.
- Guan: Remove and clean, or replace
- NEC: Remove and clean, or replace.
- generatorpartspro: Remove and clean
Sludge on oil screen
8 brands- Continental: Remove and clean.
- Cummins/Onan: Remove and clean; Remove and clean.
- Doosan: Remove and clean
- Ernest: Remove and clean
- Garretson: Remove and clean.
- Guan: Remove and clean
- NEC: Remove and clean.
- generatorpartspro: Clean screen
Badly worn oil pump
8 brands- Continental: Replace.
- Cummins/Onan: Repair or replace pump; Repair or replace pump.
- Doosan: Replace
- Ernest: Replace
- Garretson: Replace.
- Guan: Replace
- NEC: Replace.
- generatorpartspro: Replace unit
Low oil level
8 brands- Atlas Copco: Add oil
- Bgm/Nhm: Add oil as required
- Cummins/Onan: Add oil as required; Add oil as required.
- Ingersoll Rand: Add oil
- John Deere: Add oil; Add oil.
- Marquis: Add oil as required
- Northern Lights: Fill crankcase to proper level; Fill crankcase to proper level.
Oil too light
8 brands- Continental: Drain, refill with proper oil.
- Cummins/Onan: Drain, refill with proper oil; Drain, refill with proper oil.
- Doosan: Drain, refill with proper oil
- Ernest: Drain, refill with proper oil
- Garretson: Drain, refill with proper oil.
- Guan: Drain, refill with proper oil
- NEC: Drain, refill with proper oil.
- generatorpartspro: Drain, refill with proper oil
Oil badly diluted
8 brands- Continental: Drain, refill with proper oil.
- Cummins/Onan: Drain, refill with proper oil; Drain, refill with proper oil.
- Doosan: Drain, refill with proper oil
- Ernest: Drain, refill with proper oil
- Garretson: Drain, refill with proper oil.
- Guan: Drain, refill with proper oil
- NEC: Drain, refill with proper oil.
- generatorpartspro: Drain, refill with proper oil
Badly worn bearings
7 brands- Continental: Replace.
- Cummins/Onan: Replace; Replace.
- Doosan: Replace
- Ernest: Replace
- Garretson: Replace.
- Guan: Replace
- NEC: Replace.
Defective oil pressure gauge
7 brands- Continental: Replace.
- Cummins/Onan: Replace; Replace engine or panel unit
- Doosan: Replace
- Ernest: Replace
- Garretson: Replace.
- Guan: Replace
- NEC: Replace.
Improper type of oil
4 brands- Atlas Copco: Drain, fill crankcase with proper viscosity and quality
- Ingersoll Rand: Drain, fill crankcase with oil of proper viscosity and quality
- John Deere: Drain, fill crankcase with oil of proper viscosity and quality; Drain, fill crankcase with oil of proper viscosity and quality.
- Northern Lights: Drain and fill crankcase with correct oil; Drain and fill crankcase with correct oil.
Oil level low
4 brands- Detroit Diesel: Restore the oil level. Inspect the generator set for oil leaks.
- Generac: Add oil and re-check
- Kohler: Restore the oil level. Inspect the generator set for oil leaks.
- Spectrum: Restore the oil level. Inspect the generator set for oil leaks.
Low crankcase oil level
4 brands- Doosan: Fill crankcase to proper oil level.
- Ingersoll Rand: Fill crankcase to proper oil level.
- John Deere: Fill crankcase to proper oil level.
- Katolight: Fill crankcase to proper oil level.
Clogged oil cooler or filter
4 brands- Doosan: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
- Ingersoll Rand: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
- John Deere: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
- Katolight: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
Excessive oil temperature
4 brands- Doosan: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
- Ingersoll Rand: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
- John Deere: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
- Katolight: Remove and inspect oil cooler. See your John Deere engine distributor or servicing dealer.
Defective oil pump
4 brands- Doosan: Remove and inspect oil pump. See your John Deere engine distributor or servicing dealer.
- Ingersoll Rand: Remove and inspect oil pump. See your John Deere engine distributor or servicing dealer.
- John Deere: Remove and inspect oil pump. See your John Deere engine distributor or servicing dealer.
- Katolight: Remove and inspect oil pump. See your John Deere engine distributor or servicing dealer.