Doosan DX60R Shop Manual page 210

Any part which is found defective as a result of inspection
or ant part whose measured value does not satisfy the
standard or limit must be replaced.
Any part determined to not meet the service standard or limit
before the next service, as determined from the state of
current rate of wear, should be replaced even though the part
currently meets the service standard limit.
Never remove or attempt to remove the tamper-proof
devices from the full-load fuel adjusting screw or the high-
speed throttle limit screw on the fuel injection pump and
governor assembly. These adjustments have been made at
the factory to meet all applicable emissions regulations and
then sealed.
Never attempt to make any adjustments to these sealed
adjustment screws. If adjustments are required, they can be
made only by a qualified fuel injection shop that will ensure
the injection pump continues to meet all applicable emissions
regulations and then replace the tamper-proof seals.
Never use a steel wire brush to clean fuel injectors. Damage
to the nozzle and other components is likely to result.
Allow the engine to warm-up for at least five minutes and
the idle speed of the engine to return to normal before
engaging the transmission or any PTOs. Engaging the
transmission or PTO at an elevated engine speed could
result in an unexpected movement of the equipment.
Engine
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CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
MEMO
SP001693