Doosan DX60R Shop Manual page 349

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.
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 loosen or remove the four bolts retaining the fuel
injection pump drive gear to the fuel injection pump hub. Do
not disassemble the fuel injection pump drive gear from the
hub. Correct fuel injection timing will be very difficult or
impossible to achieve.
Do not rotate the crankshaft with the injection pump removed.
Each pressure adjusting shim removed or added changes
the pressure threshold by approximately 275 psi (1.9 MPa,
2
19 kgf/cm ). Adding adjusting shims increases the
threshold pressure. Removing adjusting shims reduces the
pressure threshold.
Engine
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CAUTION
SP001693
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