Failure Diagnosis - Doosan DP158L Series Operation & Maintenance Manual

7. Lubrication system

Failure Diagnosis

Phenomenon
Too much oil consumption
Low oil pressure
Contaminated oil
Causes
Bad oil
Oil leakage from the oil seal ring and packing part
Worn or damaged piston and piston ring
Worn cylinder liner
Burnt piston ring
Worn valve guide oil seal, valve guide, or valve stem
Bad oil
Burnt oil pump relief valve
Clogged oil pump strainer
Worn oil pump gear
Cracked oil delivery pipe of the oil pump
Defect oil pump
Oil pressure gauge fault
Worn bearings
Clogged oil filter
Gas leakage
Bad oil
120
Troubleshooting
Replace oil with specified oil.
Replace it
Replace it
Replace it
Replace it
Replace it
Replace oil with specified oil.
Replace it
Cleanse the strainer
Replace it
Replace it
Repair or replace it
Repair or replace it
Replace it
Replace the oil filter with a new one
Replace piston ring with a new one
Replace oil with specified oil.