
4.MAINTENANCE B-70264EN/02
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4.3 DETAILS OF MAINTENANCE
When opening the panels and doors during maintenance, keep the
power turned off. Before replacing oil, be sure to check that purging
is completed.
4.3.1 Turbo Blower Oil
(1) Check method
With the laser oscillator at a rest, check to see if the oil level in the
turbo blower is between graduations L and H. When the turbo blower
is running, it is impossible to check the amount of oil correctly.
Fig. 4.3.1(a) Appearance of turbo blower Fig. 4.3.1(b) Oil gage
(2) Replacement method
a) Before replacing the oil, be sure to stop the oscillator according
to the correct procedure and turn off the power. Remove the
hexagonal-head screw from the oil inlet of the turbo blower with
a 17 mm wrench. Be careful not to lose the O-ring on the
hexagonal-head screw or contaminate it.
CAUTION
If the oscillator is not stopped with the correct
procedure, the pressure in the vacuum system in
the oscillator becomes negative. Opening the oil
inlet under such a condition lets air get in the turbo
blower. This flow of gas causes oil mist to get into
the vacuum system of the oscillator, resulting in
contamination of internal mirrors.
b) Get a container for oil drain on hand, and put the tip of the drain
tube into the container.
Turn the oil drain cock through 90 degrees, and the oil will start
draining.
c) After all the oil has been drained, close the oil drain cock by
setting it back in the initial place.