Komatsu PC138USLC Operation & Maintenance Manual page 324

MAINTENANCE
Cleaning Recirculated Air Filter
1. Open cover (1) at the front bottom left of the operator's seat.
2. Take out internal filter (2).
3. Clean internal filter (2) with compressed air. If there is oil stuck
to the filter (2) or it is extremely dirty, wash it in a neutral agent.
After washing, dry it thoroughly before using it again.
REMARK
If the clogging of the filter cannot be removed by blowing it with
compressed air or washing in water, replace the filter with a new
one.
4. After cleaning filter (2), return it to its original position and close
cover (1).
Cleaning Fresh Air Filter
1. Use the starting key to unlock cover (1) at the rear left of the
operator's cab, open cover (1) by hand, secure it in position
with cover support lever (3), then remove filter (2) from the
inside.
2. Clean the filter with compressed air. If there is oil on the filter,
or if the filter is extremely dirty, wash it in a neutral agent. After
rinsing it in water, dry it thoroughly before using it again.
Replace the filter with a new part every year. If the clogging of
the filter cannot be removed by blowing with air or washing in
water, replace the filter immediately.
3. After cleaning, return filter (2) to its original place, remove
cover support lever (3), and close the cover. When doing this,
lock it with the starting key. After locking it, do not forget to
remove the starting key.
REMARK
The FRESH filter must be installed facing in the correct direction.
When installing, insert the long (L) end of filter (2) into the filter case
first. If the short (S) end is installed first, cover (1) will not close.
MAINTENANCE PROCEDURE
4 - 63