Komatsu WA380-8, Operation & Maintenance Manual, Page: 354 / 432

1.
Start the engine and set the engine speed to approximate-
ly 1500 rpm.
2.
Press fan switch (1) and set the air flow to “Hi”.
3.
Press temperature adjustment switch (2) and set the tem-
perature to 18 °C.
4.
Fully open the doors and windows.
5.
Press air conditioner switch (3) to turn the air conditioner
switch ON.
6.
Check the condition of the refrigerant gas (chlorofluorocar-
bon 134a) that circulates the refrigerant circuit, through
sight glass (5) (inspection window) of air conditioner hose
(4).
A: Quantity of refrigerant
B: Condition viewed through sight glass
a: Appropriate: Just after the air conditioner switch is
turned ON, a small number of bubbles are seen. Then,
the sight glass becomes milky white, and then becomes
pale.
b: Insufficient: After the air conditioner switch is turned ON,
bubbles are seen continuously.
X: State of refrigerant flow
Y: Condition viewed through sight glass
x: Bubbles are seen: Gaseous and liquid refrigerants are
mixed.
y: No bubble: All refrigerant becomes liquid and transpar-
ent.
z: Milky white: Oil and refrigerant are separated and their
mixture is milky white.
MAINTENANCE AND SCHEDULE OF AIR CONDITIONER
Check point Check items Maintenance schedule
Check before
operation
6 months in-
spection
Replacement
interval
Filter Clogging, dirt Implement - 2 years
Condenser Clogging, dirt Implement - -
Belt Looseness, damage Implement - 2 years
Refrigerant gas Charge amount - Implement -
Piping Looseness, damage,
leakage - Implement -
Receiver drier - - - 2 years
METHOD FOR REPLACING SLOW-BLOW FUSE
NOTICE
• When replacing the slow-blow fuse, be sure to turn the starting switch to OFF position and, after
confirming that the system operating lamp is not lit, set the battery disconnect switch key to OFF
position.
• Replace the slow blow fuse with the one of the same capacity.
Should the slow-blow fuse is blown, investigate the cause and take necessary actions.
MAINTENANCE PROCEDURE MAINTENANCE
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