Komatsu D375A-8, Operation & Maintenance Manual

Page: 350 / 466

1.
Loosen knob (1) at the rear left of the machine.
2.
Remove upper cover (2).
3.
Remove fresh air filter cover (3).
4.
Remove fresh air filter (4).
5.
Remove knob (5) at the rear left in the cab, and remove
bracket (6) from part (a).
6.
Remove the recirculation air filter from bracket (6).
7.
Blow dry compressed air (0.2 MPa {2.1 kg/cm
2
} or below)
from the inside of each filter along the pleats.
NOTICE
If there is a small hole or a thin portion on the filter, re-
place the filter.
If the pleats of each filter or the seal of the fresh air fil-
ter is damaged, replace it as well.
REMARK
• Since the filtering ability of the filters decreases as they are aged, replace them every 500 operating
hours or every year.
• In an environment such as sandy ground, grassy terrain, etc. where the filters are clogged easily, clean
more frequently.
• If the filters are too clogged to clean, stained with oil, or extremely dirty, replace them with new ones.
For replacement, see “METHOD FOR REPLACING AIR CONDITIONER FRESH/RECIRC FILTERS”.
METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT
In the following cases, bleed air according to the following procedure.
• When the hydraulic piping, work equipment pump, fan pump, etc. is replaced or repaired.
• When all of the hydraulic oil is replaced.
Since the engine needs to be started and the work equipment needs to be operated, see OPERATION.
NOTICE
• If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke
end, air taken inside the cylinder may cause damage to the piston packing.
• While performing air bleeding work, constantly check the oil level in the hydraulic tank.
If the work is continued while the hydraulic oil level is low, air is not bled perfectly, and that can
damage the pump.
MAINTENANCE PROCEDURE MAINTENANCE
4-40