Komatsu WA100M-7, Operation And Maintenance Manual

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5.8 Maintenance procedure
Maintenance Corrective maintenance
WA80M-7, WA100M-7 – VENAM03001
5-29
If the cooling effect of the air conditioner is poor, this may be
caused by lack of refrigerant (gas).
In this case, check the sight glass (2) of the filter dryer (1). The
sight glass is installed at the side of the condenser, on the con-
tainer.
Create the following conditions before inspecting:
 Start the engine and let it run at 1000 rpm.
 Turn the air conditioner ON.
 Set the airflow to maximum.
 Set the temperature to minimum.
 Open the doors and windows fully.
 Turn the air conditioner switch ON.
If the condition of sight glass (2) is “correct” as shown in the dia-
gram on the right, the condition is normal. (When the air condi-
tioner is switched on, you will see a few bubbles. After this, the
liquid takes on a translucent, milky white colour.)
If the condition of sight glass (2) is “insufficient” as shown in the
diagram on the right, the refrigerant level is too low. Consult your
Komatsu distributor.
(When the air conditioner is switched on, there will always be a
few bubbles.)
Operating the air conditioner off-season
Even during the off-season, operate the air conditioner for 3 – 5
minutes once a month to maintain the oil film at all parts of the
compressor.
1
2
Status at the sight glass Refrigerant
Correct
Insufficient
Level
A = Bubbles in the liquid refrigerant
B = The refrigerant is clear
C = Oil and refrigerant are separated; liquid is a thin, milky
white.