Doosan 9/235HA Operation & Maintenance Manual page 37

Improper exhaust.
Battery overdischarge.
Excessive black smoke.
Excessive white smoke.
Low electrolyte level.
Charging failure.
Excessive electrical loads.
ENGINE INSTRUCTION MANUAL
Clogged air cleaner.
Damaged injector nozzle.
Wrong injector nozzle.
Injection timing incorrect.
Excessive injection volume.
Incorrect fuel.
Water mixing in fuel
Low compression pressure.
Injection timing incorrect.
Low coolant temperature
Faulty turbocharger
Crack in battery body.
Natural consumption.
Loose or damaged belt.
Faulty alternator.
Damaged wiring or contact failure.
Insufficient battery capacity for the application.
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9/235HA, 10/215HA