Komatsu D31EX-21, Operation & Maintenance Manual, Page: 200 / 256

SERVICE PROCEDURE
MAINTENANCE
4-20
CLEANING OR REPLACING OUTER ELEMENT
1. Open engine side cover on the left side of machine.
2. Remove three clips (2), then remove dust cup (3).
NOTICE
Never remove inner element (5). If it is removed, dust will
enter and cause engine trouble.
3. Remove outer element (4).
NOTICE
When cleaning the dust cup, do not remove evacuator
valve (6).
4. Clean the inside of the air cleaner body and dust cup.
NOTICE
The inner element must not be used again even after its
cleaning. When replacing the outer element, replace the
outer element at the same time.
5. Direct dry compressed air (less than 0.69 MPa (7 kgf/cm²)
to the outer element (3) from inside along its folds, then
direct it from outside along its folds and again from inside
6. Replace any outer element, which has been cleaned 6
times or used for one year. Replace the inner element at
the same time.
7. If the yellow piston rises to above 3/5 (5 kPa) of the trans-
parent portion, replace the inner and outer element.