Komatsu GD555-5 Operation & Maintenance Manual page 271

SERVICE PROCEDURE SERVICE PROCEDURE
5. Direct dry compressed air (less than 0.2 MPa {2.1 kg/cm
PSI}) to the outer element from inside along its pleats, then
direct it from outside along its pleats and again from inside.
1) Replace the outer element if it has been cleaned 6 times
repeatedly or used throughout 1 year. Replace the inner
element at the same time.
2) If the yellow display panel of the dust indicator reaches the
center of the scale (5 kPa) immediately after the outer
element has been cleaned, replace both the inner and
outer elements, even when the outer element has not been
cleaned 6 times.
6. If small holes or thinner parts are found on the element when
it is checked by shining a light through it after cleaning, replace
the element.
NOTICE
When cleaning the element, do not hit it or beat it against something.
Do not use an element whose pleats or gasket or seal are damaged.
If force is used when assembling, the clip or air cleaner body will be
damaged, so push it in straight when installing it.
Do not operate the machine with the inner element removed. This will
damage the engine.
7. Set the cleaned outer element and install dust cup (4), then secure them with clips (3).
If the inner and outer element have been replaced, always replace O-ring (8) with a new part.
8. Press the button on dust indicator (1) to return the yellow display panel to its original position.
9. Close the engine side cover on the right side of the machine.
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CAUTION
MAINTENANCE MAINTENANCE