Komatsu H75051 Operation & Maintenance Manual page 347

MAINTENANCE
6.
Open the engine side cover (4) on the left side of the ma-
chine.
7.
Check the condition of the refrigerant gas (Hydrofluorocar-
bons HFC-134a) that circulates the refrigerant circuit,
through the sight glass (6) (inspection window) of the re-
ceiver drier piping (5).
(A) Just after the air conditioner switch is turned on, a
small number of bubbles are seen. After a while, the
sight glass becomes milky white, and then becomes
pale: Appropriate
(B) After the air conditioner switch is turned on, bubbles
are seen continuously: Insufficient
Condition viewed through the
sight glass
MAINTENANCE AND SCHEDULE OF AIR CONDITIONER
Check point
Filter
Condenser
Bubbles are seen: Gaseous and liquid refrigerants are mixed.
No bubble: All refrigerant becomes liquid and transparent.
Milky white: Oil and refrigerant are separated and their mixture is milky white.
Check items
Clogging, dirt
Clogging, dirt
State of refrigerant flow
Maintenance schedule
Check before op- 6 months inspec-
eration
Implement
Implement
MAINTENANCE PROCEDURE
Replacement in-
tion terval
- 2 years
- -
4-37