Doosan DX60R Shop Manual page 206

If the engine coolant pump must be replaced, replace the
engine coolant pump as an assembly only. Do not attempt
to repair the engine coolant pump or replace individual
components.
Use a new special O-ring between the engine coolant pump
and the joint. Be sure to use the special O-ring for each
engine model. Although the O-ring dimensions are the
same as a commercially available O-ring, the material is
different.
Remove or install the high-pressure fuel injection lines as
an assembly whenever possible. Disassembling the high-
pressure fuel injection lines from the retainers or bending
any of the fuel lines will make it difficult to reinstall the fuel
lines.
After marking the position of the pump drive gear, do not
rotate the engine crankshaft. Rotating the crankshaft will
cause the fuel injection pump to become misaligned.
Do not use a high-pressure wash directly on the alternator.
Water will damage the alternator and result in inadequate
charging.
Do not reverse the positive (+) and negative (-) ends of the
battery cable. The alternator diode and stator coil will be
damaged.
Engine
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CAUTION
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CAUTION
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CAUTION
CAUTION
MEMO
SP001693