Doosan DX60R Shop Manual page 202

Never engage the starter motor while the engine is running.
This may damage the starter motor pinion and / or ring
gear.
New Engine Break-in:
On the initial engine start-up, allow the engine to idle for
approximately 15 minutes while you check for proper
engine oil pressure, diesel fuel leaks, engine oil leaks,
coolant leaks, and for proper operation of the indicators
and / or gauges.
During the first hour of operation, vary the engine speed
and the load on the engine. Short periods of maximum
engine speed and load are desirable. Avoid prolonged
operation at minimum or maximum engine speeds and
loads for the next four to five hours.
During the break-in period, carefully observe the engine oil
pressure and engine temperature.
During the break-in period, check the engine oil and coolant
levels frequently.
Never attempt to modify the engine's design or safety
features such as defeating the engine speed limit control or
the fuel injection quantity control.
Failure to comply may impair the engine's safety and
performance characteristics and shorten the engine's life.
Any alterations to this engine may affect the warranty
coverage of your engine.
Protect the air cleaner, turbocharger (if equipped) and
electric components from damage when you use steam or
high-pressure water to clean the engine.
Engine
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CAUTION
CAUTION
CAUTION
CAUTION
MEMO
SP001693