Doosan D20S-5 Operation & Maintenance Manual page 140

Operation Section
ROUGH, UNSTABLE, OR INCORRECT IDLE, STALLING
Checks
Engine Mechanical
Check
Check the engine for:
• Broken motor mounts.
• Improper valve timing.
• Low compression.
• Improper valve clearance.
• Worn rocker arms.
• Broken or weak valve springs.
• Worn camshaft lobes.
Action
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