Komatsu D31EX-21, Operation & Maintenance Manual, Page: 224 / 256

SERVICE PROCEDURE
MAINTENANCE
4-44
CLEAN AIR CONDITIONER AIR FILTER (FRESH/RECIRC FILTER) 4
(Machines equipped with cab)
Clean the air conditioner air filter if it becomes clogged or if there is dirt or oil stuck to it.
In places where there is a lot of dust, clean the air filter once a week. In addition, clean the air conditioner air filter
at the same time, when cleaning the engine air cleaner.
1. Open the inspection cover at the right side at the rear of
the machine, turn knob (1), remove inside cover (2), then
remove FRESH filter (3).
2. Remove the filter box, then brush out the dirt accumulated
inside the box through the cleaning hole in the hood.
When doing this, be careful not to let any dirt or dust get
into the fresh air intake port leading to the cab.
3. Remove cover (4) at the rear of the operator's seat, then
remove RECIRC filter (5).
4. Clean filters (3) and (5) with compressed air. If the filters
are stained with oil or extremely dirty, wash them in neutral
detergent. After washing the filters, dry them, and then
install them.
REMARK
If the filters cannot be cleaned with air or in water, replace them
with new ones.