Hitachi EX1900-5 Operator's Manual page 214

Ventilation Air Filter
CAUTION: Always wear safety glasses or gog-
gles when using compressed air (Less than 0.2
2
MPa, 2 kgf/cm , 28 psi) to clean filters.
IMPORTANT: Plugged ventilation or recirculation air
filter will reduce cooling capacity of the
air conditioner. Be sure to clean them
periodically.
Clean Air Filter --- as required
1. Ventilation air filters (2) (three pieces) are located in
room (1) under the cab.
Remove ventilation air filters (2).
2. Clean ventilation air filters (2) with compressed air
(Less than 0.2 MPa, 2 kgf/cm
Replace Air Filter --- after cleaning 4 times
Changing interval of ventilation air filter (2) differs de-
pending on environmental conditions.
If the cooling capacity decreases after cleaning ventila-
tion air filter (2), caused by filter plugging, replace it ear-
lier than the standard interval.
MAINTENANCE
2
, 28 psi) or a soft brush.
7-82
1
2
M18C-01-012
M117-07-070